ch 10 test
The directions of each amino acid in a polypeptide are indicated by a codon that consists of _____ nucleotide(s) in an RNA molecule.
3
When one DNA molecule is copied to make two DNA molecules, the new DNA contains
50% of the parent DNA
Which of the following statements regarding a DNA double helix is ALWAYS true?
A = T, G = C
Which of the following options best depicts the flow of information when a gene directs the synthesis of a cellular component?
DNA --> RNA --> protein
Which of the following enzymes catalyzes the elongation of a new DNA strand?
DNA polymerase
Which of the following statements regarding DNA is false?
DNA uses the nitogenous base uracil
If one strand of DNA is CGGTAC, the corresponding strand would be
GCCATG
The envelope of a flu virus
HELPS the virus ENTER the cell
Which of the following statements about herpesviruse is false?
Herpesviruses reproduce inside the host cell's MITOCHONDRIA
Which of the following people conducted the experiments that demonstrated that DNA is the genetic material of bacteriophages?
Hershey and Chase
Which of the following enzymes does HIV use to synthesize DNA on an RNA template?
REVERSE transcriptase
Which of the following statements regarding RNA is false?
RNA uses the sugar dextrose
Experiments have demonstrated that the "words" of the genetic code (the units that specify amino acids) are
THREE-nucleotide sequences
Which of the following statements regarding the structure of DNA is false?
The SEQUENCEof nucleotides along the length of a DNA stand is restricted by the base-pairing rules
Which of the following statements is false?
The lysogenic cycle typically results in the rapid lysis of all INFECTED cells
Which of the following statements about the treatment or prevention for a prion infection is true?
There is NO KNOWN treatment or cure for prion infections
DNA replication
USES each strand of a DNA molecule as a template for the creation pf a new strand
Which of the following statements regarding viral diseases is false?
VERY FEW new human diseases have originated in other animals because the genetic differences are too great.
The way that genetic material of a bacteriophage enters a bacterium is most like the way that
a DRUG is injected with a hypodermic needle
Why does a DNA strand grow only in the 5' to 3' direction?
b/c DNA polymerases can only ADD nucleotides to the 3' end of the growing molecule
How do viroids harm the plants that are infected with them?
by altering the plants' GROWTH
What will be the most likely cause of a new swag avian flu pandemic like the 1918-1919 flu pandemic that killed approximately 40 million people worldwide?
easy viral transmission from person to person
The monomers of DNA and RNA are
nucleotides
When a T2 bacteriophage infects an Escherichia coli cell, which part of the phage enters the bacterial cytoplasm?
only the DNA
One type of virus that infects bacteria is called a
phage
Viral DNA incorporated into host cell DNA is known as a(n)
prophage (b/c DNA)
The "one gene-one polypeptide" theory states that
the FUNCTION of an INDIVIDUAL gene is a dictate the production of a specific polypeptide
A base substitution mutation in a gene does not always result in a different protein. Which of the following factors could account for this?
the fact that SOME AMINO acids are specified from more than one codon
The transfer of genetic information from DNA to RNA is called
transcription
Which of the following shows the step of a viral infection in the proper order?
virus locates host cell --> PENETRATES cell membrane --> enters nucleus --> alters host cell DNA --> host cell produces copies of virus
