Biology Test 3
Who discovered the structure of DNA? Pauling Watson and Crick Chase Franklin Hershey and Chase
Watson and Crick
An individual who is homozygous ______. expresses the dominant trait carries two different alleles for a gene is a carrier of a genetic disorder carries two copies of the same allele for a gene expresses the recessive trait
carries two copies of the same allele for a gene
What do DNA and RNA have in common? number of strands in the molecule purpose is the storage of genetic information types of nucleotides type of sugar composed of nucleotides
composed of nucleotides
The number of nucleotide bases on the mRNA that together designate an amino acid is _____; this unit is called a(n) _____. 2 ... anticodon 2 ... dipeptide 3 ... codon 3 ... triose 1 ... amino acid
3 ... codon
What is the proper order of the following events in the expression of a eukaryotic gene? 1.translation 2.RNA processing 3.transcription 3, 2, 1 2, 3, 1 1, 2, 3
3, 2, 1
If adenine makes up 20% of the bases in a DNA double helix, what percent of the bases are guanine? 80% 60% 40% 20% 30%
30%
A woman with type O blood is expecting a child. Her husband is type A. Both the woman's father and her husband's father had type B blood. What is the probability that the child will have type O blood? 75% 100% 25% 50% 0%
50%
Evidence for the spiral nature of DNA came from ______. X-ray crystallography studies studies of pathogenic bacteria base rule studies transforming studies bacteriophage studies
X-ray crystallography studies
Evidence from the spiral nature of DNA came from ____. X-ray crystallography studies studies of pathogenic bacteria base rule solutions transforming studies bacteriophage studies
X-ray crystallography studies
What protects mRNA from attack by cytoplasmic enzymes? the excision of introns RNA splicing the excision of exons the lack of RNA-digesting enzymes in the cytoplasm a cap and tail
a cap and tail
Which one of the following lists the chemical components of a nucleotide? a sugar and a purine a sugar and a phosphate group only a sugar and a pyrimidine a nitrogenous base, a sugar, and a phosphate group a nitrogenous base and a sugar only
a nitrogenous base, a sugar, and a phosphate group
The backbone of DNA consists of ______. nitrogenous bases a repeating sugar-nucleotide-sugar-nucleotide pattern a repeating sugar-phosphate-sugar-phosphate pattern a repeating ACTGACTG pattern paired nucleotides
a repeating sugar-phosphate-sugar-phosphate pattern
Flower color in snapdragons is an example of incomplete dominance. If a red-flowered plant is crossed with a white-flowered plant, the F1 generation has pink flowers. If a pink-flowered plant is crossed with a pink-flowered plant, the progeny plants will be _____. 50% pink and 50% red 100% red 100% pink 25% red, 50% pink, and 25% white 25% white and 75% red
25% red, 50% pink, and 25% white
Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes? 2:1 9:3:3:1 1:1 1:2:1 3:1
1:1
How many amino acids are common to all living systems? 20 10 25 15 30
20
An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair. If an individual with wavy hair mates with an individual with straight hair, what is the probability that their child will have curly hair? 0% 25% 50% 75% 100%
0%
The codon for leucine is CUC. How many different amino acids could possibly result from a point mutation of the second C? 1 3 5 7
1
Cytosine makes up 38% of the nucleotides in a sample of DNA from an organism. What percent of the nucleotides in this sample will be thymine? 62% 38% 24% 12%
12%
A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes? A, B, or O AB only AB or O A or B only A, B, AB, or O
A, B, AB, or O
The DNA codon AGT codes for an amino acid carried by a tRNA with the anticodon ______. UCA TCU AGU TCA AGT
AGU
If one strand of a DNA double helix has the sequence GTCCAT, what is the sequence of the other strand? ACTTGC TGAACG CAGGTA CAGGUA CUGGTU
CAGGTA
Which of theses is a differene between a DNA and an RNA molecules? DNA contains uracil, where RNA contains thymine DNA is a polymer composed of nucleotides, whereas RNA is a polymer composed of nucleic acids DNA is double stranded, where RNA is single stranded DNA contains five carbon sugars, where RNA contains six carbon groups DNA contains nitrogen bases, where RNA contain phosphate groups.
DNA is double stranded, where RNA is single stranded
Two new strands of DNA grow as bases are added by the enzyme _____. DNA replicase RNA polymerase DNA polymerase polynucleotidase bacterial duplicating complex
DNA polymerase
During replication, ______ are the enzymes responsible for joining the nucleotides of a new DNA strand together. DNA helicases DNA ligases DNases DNA polymerases DNA gyrases
DNA polymerases
What is the genotype of an individual who is heterozygous for dimples? dimples DD Dd dd DI
Dd
Which one of the following choices is true of tRNA? Each tRNA binds a specific amino acid. tRNAs carry special sequences known as codons. tRNAs are extremely small molecules. There are four types of tRNA. All of the above statements are true.
Each tRNA binds a specific amino acid.
A cell biologist found that two different proteins with different structures were translated from two different mRNAs. These mRNAs, however, were transcribed from the same gene in the cell nucleus. Which mechanism below could best account for this? Different systems of DNA unpacking could result in two different mRNAs. The two proteins have different functions in the cell. The gene could be transcribed in different directions to produce two different proteins. A mutation might have altered the gene. Exons from the same gene could be spliced in different ways to make different mRNAs.
Exons from the same gene could be spliced in different ways to make different mRNAs.
R = can roll tongue; r = can't roll tongue. A couple who both have the ability to roll their tongues have a son who is also a tongue-roller. The son is curious about whether he is homozygous or heterozygous for the tongue-rolling trait. How could he find out? Have children with a woman who is a non-roller. If any of their children are non-rollers, then he is a heterozygote. He will have to wait to have grandchildren before the question can be answered. Have children with a woman who is a non-roller. If any of their children are tongue-rollers, then he is homozygous recessive. Have children with a woman who is also a tongue-roller. If their children are tongue-rollers, then he is homozygous dominant. Have children with a woman who is also a tongue-roller. If all their children are non-rollers, then he is a heterozygote.
Have children with a woman who is a non-roller. If any of their children are non-rollers, then he is a heterozygote
Which one of the following statements correctly describes mRNA processing in eukaryotes? Exons are cut out and transported to smooth endoplasmic reticulum. Exons are cut out, and the introns are spliced together. Introns are cut out and spliced together at the end of the mRNA. Introns are cut out, and the resulting exons are spliced together. Introns are cut out and transported to the ribosomes.
Introns are cut out, and the resulting exons are spliced together.
How does RNA polymerase know where to start transcribing a gene into mRNA? It looks for a terminator sequence. It starts when the enzyme attaches to a certain nucleotide sequence called a promoter at the beginning of a gene. Transfer RNA acts to translate the message to RNA polymerase. It starts at one end of the chromosome. The ribosome directs it to the correct portion of the DNA molecule.
It starts when the enzyme attaches to a certain nucleotide sequence called a promoter at the beginning of a gene.
Which summary of protein synthesis is correct? Messenger RNA is made on a DNA template, and then amino-acid-bearing transfer RNAs line up on it through codon-anticodon pairing. Transfer RNAs line up on a ribosome, and amino acids bind to them with hydrogen bonds. DNA exchanges its thymine units with uracil in polymerase. This activates polymerase, and it starts joining amino acids together. DNA leaves the nucleus, goes to a ribosome, and catalyzes the polymerization of amino acids in a protein. None of the above choices is correct.
Messenger RNA is made on a DNA template, and then amino-acid-bearing transfer RNAs line up on it through codon-anticodon pairing.
The lagging strands are synthesized in segments called____. Okazaki fragments repeating primers Chargoff's segments replisomes parental DNA
Okazaki fragments
DNA replication occurs_____ Prior to Prophase when the chromosomes align at the cell's equator after telophase in both meiosis I and meisos II
Prior to Prophase
Transcription begins when RNA polymerase binds to the Terminator on DNA Initiator of DNA Promoter on DNA Promoter on RNA
Promoter on DNA
Translation converts the information stored in ______ to ______. DNA . . . RNA RNA . . . a polypeptide protein . . . DNA DNA . . . a polypeptide RNA . . . DNA
RNA . . . a polypeptide
Which of the following enzymes is responsible for RNA synthesis? RNase RNA gyrase RNA helicase RNA ligase RNA polymerase
RNA polymerase
Which one of the following catalyzes the linkage between nucleotides to form mRNA? reverse transcriptase tRNA RNA RNA ligase RNA polymerase
RNA polymerase
Translation converts the information stored in ___ to ___ DNA... RNA RNA... a polypeptide/protein protein... DNA DNA...a protein RNA...DNA
RNA... a polypeptide/protein
You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon. All of the F1 are pink. What can you say about the alleles for the parental traits? Pink is dominant, while red and white are recessive. Red and white show incomplete dominance. Red and white are codominant. Red is dominant. Both red and white are recessive.
Red and white show incomplete dominance.
What enzyme duplicates telomeres in some cells? DNA polymerase Polyadenylate polymerase Telomerase RNA polymerase None of the Above
Telomerase
What are the ends of chromosomes called that do not get fully replicated by DNA polymerase? ROMs Stem-loop structures Poly A tails Telomeres None of the above
Telomeres
What statement would be true if the strands that make up DNA are antiparallel? The chromosomes are circular in shape The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand Base pairings create unequal spacing between the two DNA strands. One strand is positively charged while the other is negatively charged The twisting nature of DNA creates non-parallel strands.
The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand
Which of the following is characteristic of a DNA double helix? The amount of adenine is equal to the amount of uracil, and the amount of guanine is equal to the amount of cytosine. The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of uracil. The amount of adenine is equal to the amount of guanine, and the amount of thymine is equal to the amount of cytosine. The amount of adenine is equal to the amount of cytosine, and the amount of guanine is equal to the amount of thymine. The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine.
The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine
In a particular species of mammal, black hair (B) is dominant to green hair (b), and red eyes (R) are dominant to white eyes (r). When a BbRr individual is mated with a bbrr individual, offspring are produced in a ratio of 5 black hair, red eyes : 5 green hair, white eyes : 1 black hair, white eyes : 1 green hair, red eyes. Which of these explanations accounts for this ratio? Green-haired individuals have a higher prenatal mortality than black-haired individuals. The genes for both of these traits are carried on the autosomes. The expected results did not take genetic recombination into account. The genes for hair color and eye color are linked. The genes for hair color and the genes for eye color are carried on different chromosomes.
The genes for hair color and eye color are linked.
What is the key to the recognition of incomplete dominance? The phenotype of the heterozygote falls between the phenotypes of the homozygotes. The trait exhibits a continuous distribution. The alleles affect more than one trait. The heterozygote expresses the phenotype of both homozygotes. The dominant allele is not always expressed.
The phenotype of the heterozygote falls between the phenotypes of the homozygotes.
A sequence of pictures of polypeptide synthesis shows a ribosome holding two transfer RNAs. One tRNA has a polypeptide chain attached to it; the other tRNA has a single amino acid attached to it. What does the next picture show? The tRNA with the polypeptide chain leaves the ribosome. The polypeptide chain moves over and bonds to the single amino acid. The tRNA with the single amino acid leaves the ribosome. The amino acid moves over and bonds to the polypeptide chain. A third tRNA with an amino acid joins the pair on the ribosome.
The polypeptide chain moves over and bonds to the single amino acid.
Which one of the following is a list of the four bases contained in DNA? cytosine, guanine, thymine, uracil guanine, pyroline, thymine, uracil adenine, guanine, purine, thymine adenine, guanine, cytosine, thymine adenine, guanine, uracil, thymine
adenine, guanine, cytosine, thymine
Assume tall (T) is dominant to dwarf (t). If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will _____. be 3/4 tall and 1/4 dwarf all be intermediate in height all be short be 1/2 tall and 1/2 dwarf all be tall
all be tall
In transcription, _____. only one DNA strand is used as a template for the synthesis of RNA the DNA promoter region acts as an initial binding site for RNA polymerase all of the above none of the above RNA nucleotides are used
all of the above
Mutations are _____. chemical changes in the genetic material changes in the composition of a DNA molecule all of the above changes in genes that ultimately cause genetic diversity the source of new alleles
all of the above
Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family's history using pedigree analysis. The pedigree given here shows three generations of a family - some individuals have a widow's peak. (W = dominant allele and w = recessive allele) This pedigree supports the fact that widow's peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ______. none of the sons would have a widow's peak all of the offspring would have a widow's peak all of the sons and none of the daughters would have a widow's peak none of the daughters would have a widow's peak all of the daughters and none of the sons would have a widow's peak
all of the offspring would have a widow's peak
Alleles are described as ______. homologous chromosomes environmental factors that affect gene expression alternate forms of a gene heterologous chromosomes alternate phenotypes
alternate forms of a gene
Peptide bonds form between ______. amino acids an mRNA codon and a tRNA anticodon the small ribosomal subunit and the large ribosomal subunit a tRNA and the amino acid it is carrying an mRNA transcript and the small ribosomal subunit
amino acids
Viruses that infect bacteria are ______. retroviruses enveloped viruses emerging viruses proviruses bacteriophages
bacteriophages
During the replication of DNA molecules, _____. only one strand of the molecule acts as a template both strands of the DNA molecule serve as templates RNA polymerases catalyze the reaction errors never occur the cell undergoes mitosis
both strands of the DNA molecule serve as templates
After replication, ______. each new DNA double helix consists of two old strands each new DNA double helix consists of one old strand and one new strand each new DNA double helix contains 25% of the old DNA double helix each new DNA double helix consists of two new strands one new DNA double helix consists of two old strands and the other new DNA double helix consists of two new strands
each new DNA double helix consists of one old strand and one new strand
After Replication_____ each new DNA double helix consists of two old strands each new strand of DNA double helix consists of one old strand and ones new strand each new DNA double helix contains 25% of the old DNA double helix Each new DNA double helix contains of two new strands One new DNA double helix consists of two old strands and the other new SNA double helix consists of two new strands
each new strand of DNA double helix consists of one old strand and ones new strand
The expressed (coding) regions of eukaryotic genes are called ______. caps promoters exons tails introns
exons
The expressed (gene coding) regions of eukaryotic genes are called____ caps promoters exons tails introns
exons
The flow of information in a cell proceeds _____. from protein to RNA to DNA from RNA to DNA to protein from DNA to protein to RNA from RNA to protein to DNA from DNA to RNA to protein
from DNA to RNA to protein
A plant with the genotype AABbcc is _____. recessive for three different genes heterozygous for two different genes all of the above triploid homozygous for two different genes
homozygous for two different genes
In a testcross, the unknown individual (with an unknown genotype) is always crossed with a(n) _____. homozygous recessive individual heterozygous individual unknown genotype homozygous dominant individual none of these
homozygous recessive individual
What type of chemical bond joins the bases of complementary DNA strands? ionic covalent hydrophilic hydrophobic hydrogen
hydrogen
The two sugar-phosphate strands with their associated nitrogenous bases of a DNA molecule are joined to each other by _____. covalent bonds between nitrogen atoms in adenine and in thymine phosphate bonds covalent bonds between carbon atoms in deoxyribose molecules hydrogen bonds between nucleotide bases ionic bonds between guanine and cytosine
hydrogen bonds between nucleotide bases
All the offspring of a cross between a red-flowered plant and a white-flowered plant have pink flowers. This means that the allele for red flowers is ______ to the allele for white flowers. dominant codominant pleiotropic incompletely dominant recessive
incompletely dominant
What is the correct order of the stages of translation? initiation, codon recognition, peptide bond formation, translocation, termination initiation, translocation, codon recognition, peptide bond formation, termination initiation, codon recognition, translocation, peptide bond formation, termination initiation, peptide bond formation, codon recognition, translocation, termination initiation, peptide bond formation, translocation, codon recognition, termination
initiation, codon recognition, peptide bond formation, translocation, termination
A frameshift mutation replaces one nucleotide for another removes part of the protein introduces or removes a section of nucleotides joins two proteins together
introduces or removes a section of nucleotides
After an RNA molecule is transcribed from a eukaryotic gene, portions called ____ are removed and the remaining ____ are spliced together to produce an mRNA molecule with a continuous coding sequence. codons ... anticodons exons ... introns promoters ... terminators caps ... tails introns ... exons
introns ... exons
What name is given to the specific location of a gene on a chromosome? phenotype locus chromaddress genotype allele
locus
During the transcription of a given portion of a DNA molecule _____. any of the above patterns may be found mRNA is synthesized on only one of the chains mRNA is synthesized from both chains of the DNA molecule, but in different directions mRNA is synthesized from both chains of the DNA molecule half of the mRNA is synthesized on half of one chain, then the other half of the mRNA is made on the other half of the DNA
mRNA is synthesized on only one of the chains
The DNA double helix is ______. made up of two polynucleotide strands composed of adenine and thymine a puzzle to geneticists composed of adenine and guanine composed of two chromosomes
made up of two polynucleotide strands
In humans, the _____ determines the sex of the offspring because _____. male ... the sperm can fertilize either a female egg or a male egg female ... only the female provides cytoplasm to the zygote female ... only the female has two functional sex chromosomes male ... the male can contribute either an X or a Y chromosome chromosome contribution from both parents ... the offspring uses all the parents' chromosomes
male ... the male can contribute either an X or a Y chromosome
Consider the following figure. It indicates that a single amino acid substitution ______. always involves adenine and uracil may alter a protein so that it no longer functions properly is a silent mutation causes a reading-frame mutation prevents codon recognition
may alter a protein so that it no longer functions properly
The RNA that is translated into a polypeptide is ______ RNA. nuclear ribosomal nucleolar transfer messenger
messenger
The ABO blood group in humans is an example of _____ producing four phenotypes. people with genetic disorders the environment multiple alleles polygenic inheritance pleiotropy
multiple alleles
DNA and RNA are polymers composed of ______ monomers. nucleotide carbohydrate fatty acid nucleic acid amino acid
nucleotide
DNA and RNA are polymers of ______. fatty acids nucleotides monoglycerides amino acids monosaccharides
nucleotides
Monomers for the synthesis of DNA are called _____. monosaccharides fatty acids disaccharides nucleotides amino acids
nucleotides
The DNA polynucleotide structure contains all but one of the following. Which is it? deoxyribose adenine, guanine, cytosine, and thymine nitrogenous base phosphate peptide bonds
peptide bonds
The physical traits of an organism are called its _____. genotype allele hybrids phenotype gene
phenotype
A single allele that controls more than one character is _____. linked polygenic autotrophic photogenic pleiotropic
pleiotropic
What enzyme catalyzes the elongation of a new DNA strand? helicase primase ligase single-stranded binding protein polymerase
polymerase
During translation in a eukaryotic cell _____. ribosomes move into the nucleus polypeptides are synthesized at ribosomes, according to instructions carried by mRNA mRNA is synthesized by the bonding of nucleotides to the bases on the template strand of DNA tRNA carries amino acid molecules to the nucleus, where they are added to a growing polypeptide chain rRNA associates with the ribosome
polypeptides are synthesized at ribosomes, according to instructions carried by mRNA
Phenylketonuria (PKU) is an autosomal recessive disorder. Using P and p to represent the alleles, what is the genotype of a phenylketonuric person? pp PP Pp all of the above Pp or pp
pp
DNA replication _____. is spontaneous and not governed by internal factors provides proof of the one gene-one enzyme hypothesis provides the template for transcription (synthesis of mRNA) only occurs when the cell is depleted of nutrients provides exact copies of chromosomes for the progeny of cell division and assures perpetuation of the species
provides exact copies of chromosomes for the progeny of cell division and assures perpetuation of the species
Which one of the following processes takes place in the nucleus? translation replication of mitochondrial DNA association of ribosomes to form polyribosomes synthesis of ribosomes removal of introns from RNA
removal of introns from RNA
A mutation within a gene that will insert a premature stop codon in mRNA would ______. result in a polypeptide that is one amino acid shorter than the one produced prior to the mutation result in a shortened polypeptide chain result in an amino acid substitution alter the location at which transcription of the next gene begins alter the reading frame
result in a shortened polypeptide chain
Where is translation accomplished? lysosomes sER peroxisomes ribosomes nucleoli
ribosomes
Which of the following is not directly involved in DNA replication? DNA All of the above are needed. ribosomes nucleotides enzymes
ribosomes
If a strand of DNA has the sequence AAGCTC, transcription will result in a(n) ______. single RNA strand with the sequence TTCGAG DNA double helix with the sequence AAGCTC for one strand and TTCGAG for the complimentary strand single DNA strand with the sequence TTCGAG single RNA strand with the sequence UUCGAG RNA double helix with the sequence UUCGAG for one strand and AAGCUC for the complimentary strand
single RNA strand with the sequence UUCGAG
A geneticist found that a particular mutation had no effect on the polypeptide encoded by a gene. This mutation probably involved _____. insertion of one nucleotide deletion of the entire gene alteration of the start codon deletion of one nucleotide substitution of one nucleotide
substitution of one nucleotide
The anticodon of an incoming _____ molecule, carrying its amino acid, pairs with the mRNA _____ at the ribosome. amino acid ... structure tRNA ... phosphates ribosome ... protein tRNA ... codon mRNA ... amino acid
tRNA ... codon
The information carried by a DNA molecule is in _____. the total number of nucleotides it contains the order of the nucleotides in the molecule the RNA units that make up the molecule its amino acid sequence the sugars and phosphates forming its backbone
the order of the nucleotides in the molecule
In people with sickle-cell disease, red blood cells break down, clump, and clog the blood vessels. In addition, the red cells can accumulate in the spleen. Among other things this leads to physical weakness, heart failure, pain, and brain damage. Such a suite of symptoms can be explained by _____. a bacterial infection interacting with the sickle-cell allele the polygenic nature of sickle-cell disease the pleiotropic effects of the sickle-cell allele the disease being the result of the inheritance of two linked genes side effects of the drugs used to cure sickle-cell disease
the pleiotropic effects of the sickle-cell allele
One strand of DNA serves as a template for the synthesis of another so that _____. each daughter cell gets the same number of nucleotides to conserve energy the progeny of each cellular replication gets the same genetic information the helical shape of DNA is conserved DNA can serve as a template for the synthesis of other polymers
the progeny of each cellular replication gets the same genetic information
A major characteristic of the structure of DNA is that _____. the ratio of A to T is close to 1:1 and the ratio of G to C is close to 1:1 A + T = G + C the ratio of A to G is close to 1:1 and the ratio of T to C is close to 1:1 A + G = C + G the ratio of A to C is close to 1:1 and the ratio of G to T is close to 1:1
the ratio of A to T is close to 1:1 and the ratio of G to C is close to 1:1
If a mutation causes a stop codon to be inserted into the DNA sequence the resulting protein will not be affected the phenotype will change but not the genotype the resulting protein may be too short and non-functional the resulting protein may be too long and non-functional
the resulting protein may be too short and non-functional
During translation, amino acid chain elongation occurs until _____. the ribosome encounters stop codons in the mRNA no further amino acids are needed by the cell the polypeptide is long enough the ribosome runs off the end of the mRNA strand all tRNAs are empty
the ribosome encounters stop codons in the mRNA
How many nucleotides make up a codon? four three five two one
three
In a DNA double helix, adenine pairs with ______ and guanine pairs with ______. cytosine . . . thymine guanine . . . adenine uracil . . . cytosine thymine . . . cytosine cytosine . . . uracil
thymine . . . cytosine
Describe the function of DNA polymerase to unwind the DNA helix during replication to add complementary nucleotides to the ends of a growing DNA strand to seal together the broken ends of DNA strands to rejoin the two DNA strands (one new and one old) after replication to degrade damaged DNA molecules
to add complementary nucleotides to the ends of a growing DNA strand
During the process of translation, ____ matches an mRNA codon with the proper amino acid. messenger RNA DNA polymerase ATP a ribosome transfer RNA
transfer RNA
Which of the following processes occurs in the cytoplasm of a eukaryotic cell? DNA replication translation transcription translation and transcription DNA replication and translation
translation
Which one of the following is uniquely associated with RNA? exists as two different types of RNA with two different functions uracil deoxyribose hydrogen bonding between the two nucleotide strands exists as a double-stranded molecule
uracil
RNA contains ______, whereas DNA contains ______. a deoxyribose sugar . . . a ribose sugar nucleotides . . . nucleic acids uracil . . . thymine cytosine . . . guanine adenine . . . guanine
uracil . . . thymine
In humans, the inheritance of ______ is best explained as being polygenic. cystic fibrosis weight Huntington's disease blood type sickle-cell disease
weight
