Chapter 5 (part two)
C) 40
If a DNA sample were composed of 10% thymine, what would be the percentage of guanine? A) 10 B) 20 C) 40 D) 80 E) impossible to tell from the information given
E) monosaccharides.
The element nitrogen is present in all of the following except A) proteins. B) nucleic acids. C) amino acids. D) DNA. E) monosaccharides.
C) C60H102O51
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions? A) C60H120O60 B) C6H12O6 C) C60H102O51 D) C60H100O50 E) C60H111O51
A) primary level.
The structural level of a protein least affected by a disruption in hydrogen bonding is the A) primary level. B) secondary level. C) tertiary level. D) quaternary level. E) All structural levels are equally affected.
E) 14
Which molecule has hydrophilic and hydrophobic properties and would be found in plasma membranes? A) 1 B) 5 C) 6 D) 12 E) 14
D) nucleic acids
Which of the following store and transmit hereditary information? A) carbohydrates B) lipids C) proteins D) nucleic acids
C) proteins.
Enzymes are A) carbohydrates. B) lipids. C) proteins. D) nucleic acids.
B) The phosphodiester linkages between deoxyribose sugars would be broken.
Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes? A) The two strands of the double helix would separate. B) The phosphodiester linkages between deoxyribose sugars would be broken. C) The purines would be separated from the deoxyribose sugars. D) The pyrimidines would be separated from the deoxyribose sugars. E) All bases would be separated from the deoxyribose sugars.
B) 3ʹTAACGT5ʹ.
If one strand of a DNA molecule has the sequence of bases 5ʹATTGCA3ʹ, the other complementary strand would have the sequence A) 5ʹTAACGT3ʹ. B) 3ʹTAACGT5ʹ. C) 5ʹUAACGU3ʹ. D) 3ʹUAACGU5ʹ. E) 5ʹUGCAAU3ʹ.
E) guanine.
In the double helix structure of nucleic acids, cytosine hydrogen bonds to A) deoxyribose. B) ribose. C) adenine. D) thymine. E) guanine.
B) function in the synthesis of protein.
Of the following functions, the major purpose of RNA is to A) transmit genetic information to offspring. B) function in the synthesis of protein. C) make a copy of itself, thus ensuring genetic continuity. D) act as a pattern or blueprint to form DNA. E) form the genes of higher organisms.
A) X-ray crystallography
Roger Kornberg used this method for elucidating the structure of RNA polymerase. A) X-ray crystallography B) bioinformatics C) analysis of amino acid sequence of small fragments D) NMR spectroscopy E) high-speed centrifugation
E) contains one less oxygen atom.
The difference between the sugar in DNA and the sugar in RNA is that the sugar in DNA A) is a six-carbon sugar and the sugar in RNA is a five-carbon sugar. B) can form a double-stranded molecule. C) has a six-membered ring of carbon and nitrogen atoms. D) can attach to a phosphate. E) contains one less oxygen atom.
A) glycogen, starch, and amylopectin
The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are the α form. Which of the following could amylase break down? A) glycogen, starch, and amylopectin B) glycogen and cellulose C) cellulose and chitin D) starch and chitin E) starch, amylopectin, and cellulose
E) denaturation
The function of each protein is a consequence of its specific shape. What is the term used for a change in a proteinʹs three-dimensional shape or conformation due to disruption of hydrogen bonds, disulfide bridges, or ionic bonds? A) hydrolysis B) stabilization C) destabilization D) renaturation E) denaturation
B) complementary pairing of the nitrogenous bases
What is the structural feature that allows DNA to replicate? A) sugar-phosphate backbone B) complementary pairing of the nitrogenous bases C) disulfide bonding (bridging) of the two helixes D) twisting of the molecule to form an α helix E) three-component structure of the nucleotides
B) chaperonin
What is the term used for a protein molecule that assists in the proper folding of other proteins? A) tertiary protein B) chaperonin C) enzyme protein D) renaturing protein E) denaturing protein
E) 9
Which molecule is a saturated fatty acid? A) 1 B) 5 C) 6 D) 8 E) 9
C) 10
Which molecule is glycerol? A) 1 B) 6 C) 10 D) 14 E) 15
B) guanine and adenine
Which of the following are nitrogenous bases of the purine type? A) cytosine and guanine B) guanine and adenine C) adenine and thymine D) thymine and uracil E) uracil and cytosine
B) cytosine and uracil
Which of the following are nitrogenous bases of the pyrimidine type? A) guanine and adenine B) cytosine and uracil C) thymine and guanine D) ribose and deoxyribose E) adenine and thymine
A) DNA → RNA → proteins
Which of the following best describes the flow of information in eukaryotic cells? A) DNA → RNA → proteins B) RNA → proteins → DNA C) proteins → DNA → RNA D) RNA → DNA → proteins E) DNA → proteins → RNA
D) 11, 12, and 13
Which of the following combinations could be linked together to form a nucleotide? A) 1, 2, and 11 B) 3, 7, and 8 C) 5, 9, and 10 D) 11, 12, and 13 E) 12, 14, and 15
C) a nitrogenous base, a phosphate group, and a pentose sugar
Which of the following descriptions best fits the class of molecules known as nucleotides? A) a nitrogenous base and a phosphate group B) a nitrogenous base and a pentose sugar C) a nitrogenous base, a phosphate group, and a pentose sugar D) a phosphate group and an adenine or uracil E) a pentose sugar and a purine or pyrimidine
B) lipids
Which of the following is a diverse group of hydrophobic molecules? A) carbohydrates B) lipids C) proteins D) nucleic acids
D) the reaction of a fat, forming glycerol and fatty acids with the utilization of water
Which of the following is an example of hydrolysis? A) the reaction of two monosaccharides, forming a disaccharide with the release of water B) the synthesis of two amino acids, forming a peptide with the release of water C) the reaction of a fat, forming glycerol and fatty acids with the release of water D) the reaction of a fat, forming glycerol and fatty acids with the utilization of water E) the synthesis of a nucleotide from a phosphate, a pentose sugar, and a nitrogenous base with the production of a molecule of water
B) 2, 7, and 8
Which of the following molecules act as building blocks (monomers) of polypeptides? A) 1, 4, and 6 B) 2, 7, and 8 C) 7, 8, and 13 D) 11, 12, and 13 E) 12, 13, and 15
B) 5
Which of the following molecules consists of a hydrophilic ʺheadʺ region and a hydrophobic ʺtailʺ region? A) 2 B) 5 C) 7 D) 9 E) 11
E) 1 and 4
Which of the following molecules contain(s) an aldehyde type of carbonyl functional group? A) 1 B) 4 C) 8 D) 10 E) 1 and 4
E) 15
Which of the following molecules contains a glycosidic linkage type of covalent bond? A) 4 B) 6 C) 12 D) 13 E) 15
C) 7 and 8
Which of the following molecules could be joined together by a peptide bond as a result of a dehydration reaction? A) 2 and 3 B) 3 and 7 C) 7 and 8 D) 8 and 9 E) 12 and 13
D) 11 and 12
Which of the following molecules could be joined together by a phosphodiester type of covalent bond? A) 3 and 4 B) 3 and 8 C) 6 and 15 D) 11 and 12 E) 11 and 13
A) 2
Which of the following molecules has (have) a functional group that frequently is involved in maintaining the tertiary structure of a protein? A) 2 B) 3 C) 9 D) 11 E) 9 and 11
E) 13
Which of the following molecules is a purine type of nitrogenous base? A) 2 B) 3 C) 5 D) 12 E) 13
C) 7
Which of the following molecules is an amino acid with a hydrophobic R group or side chain? A) 3 B) 5 C) 7 D) 8 E) 12
D) 12
Which of the following molecules is the pentose sugar found in RNA? A) 1 B) 4 C) 6 D) 12 E) 13
D) 5ʹ-A-T-G-C-3ʹ with 5ʹ-G-C-A-T-3
Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA? A) 5ʹ-purine-pyrimidine-purine-pyrimidine-3ʹ with 3ʹ-purine-pyrimidine-purine-pyrimidine-5ʹ B) 5ʹ-A-G-C-T-3ʹ with 5ʹ-T-C-G-A-3ʹ C) 5ʹ-G-C-G-C-3ʹ with 5ʹ-T-A-T-A-3ʹ D) 5ʹ-A-T-G-C-3ʹ with 5ʹ-G-C-A-T-3ʹ E) All of these pairs are correct.
B) The 5ʹ end has a phosphate group attached to the number 5 carbon of ribose.
Which of the following statements about the 5ʹ end of a polynucleotide strand of DNA is correct? A) The 5ʹ end has a hydroxyl group attached to the number 5 carbon of ribose. B) The 5ʹ end has a phosphate group attached to the number 5 carbon of ribose. C) The 5ʹ end has thymine attached to the number 5 carbon of ribose. D) The 5ʹ end has a carboxyl group attached to the number 5 carbon of ribose. E) The 5ʹ end is the fifth position on one of the nitrogenous bases.
C) DNA nucleotides contain a different sugar than RNA nucleotides.
Which of the following statements best summarizes the structural differences between DNA and RNA? A) RNA is a protein, whereas DNA is a nucleic acid. B) DNA is a protein, whereas RNA is a nucleic acid. C) DNA nucleotides contain a different sugar than RNA nucleotides. D) RNA is a double helix, but DNA is single-stranded. E) A and D are correct.
B) They have double bonds in the carbon chains of their fatty acids.
Which of the following statements concerning unsaturated fats is true? A) They are more common in animals than in plants. B) They have double bonds in the carbon chains of their fatty acids. C) They generally solidify at room temperature. D) They contain more hydrogen than saturated fats having the same number of carbon atoms. E) They have fewer fatty acid molecules per fat molecule.
E) 14 and 15 could be joined together to form a polypeptide.
Which of the following statements is false? A) 1 and 4 could be joined together by a glycosidic linkage to form a disaccharide. B) 9 and 10 could be joined together by ester bonds to form a triacylglycerol. C) 2 and 7 could be joined together to form a short peptide. D) 2, 7, and 8 could be joined together to form a short peptide. E) 14 and 15 could be joined together to form a polypeptide.
B) bioinformatics
Which of the following uses the amino acid sequences of polypeptides to predict a proteinʹs three-dimensional structure? A) X-ray crystallography B) bioinformatics C) analysis of amino acid sequence of small fragments D) NMR spectroscopy E) high-speed centrifugation
D) carbohydrate
Which term includes all others in the list? A) monosaccharide B) disaccharide C) starch D) carbohydrate E) polysaccharide
B) 120 thymine and 120 adenine molecules.
A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of A) 120 adenine and 120 uracil molecules. B) 120 thymine and 120 adenine molecules. C) 120 cytosine and 120 thymine molecules. D) 240 adenine and 240 cytosine molecules. E) 240 guanine and 240 thymine molecules.
B) three molecules of 9 and one molecule of 10.
A fat (or triacylglycerol) would be formed as a result of a dehydration reaction between A) one molecule of 9 and three molecules of 10. B) three molecules of 9 and one molecule of 10. C) one molecule of 5 and three molecules of 9. D) three molecules of 5 and one molecule of 9. E) one molecule of 5 and three molecules of 10.
B) is more closely related to frogs than to humans.
A new organism is discovered in the forests of Costa Rica. Scientists there determine that the polypeptide sequence of hemoglobin from the new organism has 72 amino acid differences from humans, 65 differences from a gibbon, 49 differences from a rat, and 5 differences from a frog. These data suggest that the new organism A) is more closely related to humans than to frogs. B) is more closely related to frogs than to humans. C) may have evolved from gibbons but not rats. D) is more closely related to humans than to rats. E) may have evolved from rats but not from humans and gibbons.
B) The phosphodiester bonds between deoxyribose sugars would be broken.
DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase? A) The two strands of the double helix would separate. B) The phosphodiester bonds between deoxyribose sugars would be broken. C) The purines would be separated from the deoxyribose sugars. D) The pyrimidines would be separated from the deoxyribose sugars. E) All bases would be separated from the deoxyribose sugars.
