Question 1

In eukaryotes,transcription copies only one gene from one DNA strand of the chromosome.

Accepted Answer

A) True 
 B)False

Question 2

Changes in gene expression can be adaptive,helping organisms contribute more to the next generation.

Accepted Answer

A) True 
 B)False

Question 3

One key reason why viruses are not considered living organisms is

Accepted Answer

A)  viruses do not contain genetic information.
B)  viruses do not reproduce on their own.
C)  viruses are all smaller than the smallest known cells.
D)  viruses do not contain a nucleus.
E)  viruses can be frozen and still survivE.F) B) and E)
G) A) and D)

Question 4

Most antibiotics are not effective against viruses because they _____ and this does not affect the activity of viruses.

Accepted Answer

A)  inhibit synthesis of cell walls
B)  destroy DNA and RNA
C)  inhibit all protein synthesis
D)  target envelopes
E)  inhibit reverse transcriptaseF) B) and D)
G) A) and B)

Question 5

What type of mutation occurred in the following?
Normal allele GGAAUGAAACAGGAACCC
Mutant allele GGAAUGAAAUCAGGAACCC

Accepted Answer

A)  insertion
B)  substitution
C)  deletion
D)  frameshiftE) A) and B)
F) A) and C)

Question 6

HIV

Accepted Answer

A)  is a retrovirus.
B)  infects most mammals.
C)  can be killed with antibiotics.
D)  causes liver cancer.
E)  can be transmitted through the skin.F) A) and B)
G) C) and D)

Question 7

Many viruses are inhibited by antibiotics.

Accepted Answer

A) True 
 B)False

Question 8

In a "silent" mutation

Accepted Answer

A)  the codon that mutates causes a change in the amino acid specified.
B)  the codon that mutates does not cause a change in the amino acid specified.
C)  the codon that mutates causes a stop codon to occur instead of the placement of an amino acid.
D)  the mutation does not occur in a codon.
E)  the mutation is not in DNA.F) B) and E)
G) B) and D)

Question 9

In the bacterium E.coli,a repressor protein binds to the operator region of the DNA in the absence of lactose,thus preventing the transcription of the genes of the lactose operon.

Accepted Answer

A) True 
 B)False

Question 10

Most viruses

Accepted Answer

A)  infect only a few closely related species.
B)  infect only animal cells.
C)  infect a wide variety of organisms.
D)  cannot infect living cells.
E)  infect only plant cells.F) A) and D)
G) C) and E)

Question 11

The stage of viral replication in which the virus binds to a cell surface receptor is

Accepted Answer

A)  release.
B)  penetration.
C)  synthesis.
D)  attachment.
E)  assembly.F) D) and E)
G) B) and E)

Question 12

In DNA molecules,

Accepted Answer

A)  cytosine pairs with adenine.
B)  thymine pairs with uracil.
C)  adenine pairs with uracil.
D)  adenine pairs with thymine.
E)  cytosine pairs with thyminE.F) A) and D)
G) A) and C)

Question 13

The double helix of DNA is composed of building blocks called

Accepted Answer

A)  amino acids.
B)  monosaccharides.
C)  phospholipids.
D)  disaccharides.
E)  nucleotides.F) B) and D)
G) B) and E)

Question 14

If the DNA in a cell consists of 20% adenine,then it will also contain ___ guanine.

Accepted Answer

A)  20%
B)  80%
C)  30%
D)  40%
E)  10%F) A) and D)
G) C) and D)

Question 15

In the lac operon,the protein that binds to the operator to prevent transcription is

Accepted Answer

A)  the repressor.
B)  RNA polymerase.
C)  DNA polymerase.
D)  the promoter.
E)  lactosE.F) C) and E)
G) A) and B)

Question 16

What type of RNA carries amino acids to the ribosome?

Accepted Answer

A)  complementary RNA
B)  messenger RNA
C)  ribosomal RNA
D)  double-stranded RNA
E)  transfer RNAF) C) and D)
G) B) and E)

Question 17

Initiation,elongation,and termination are the three main steps in

Accepted Answer

A)  translation only.
B)  transcription and translation.
C)  transcription only.
D)  photosynthesis.E) B) and C)
F) A) and B)

Question 18

The genetic information in viruses

Accepted Answer

A)  is found in the nucleus of the virus.
B)  is always DNA.
C)  is either DNA or RNA.
D)  is always RNA.
E)  can be replicated outside of a cell.F) B) and D)
G) C) and D)

Question 19

A cell can receive new genes from a virus and then produce a new set of proteins.

Accepted Answer

A) True 
 B)False

Question 20

HIV is a

Accepted Answer

A)  double-stranded DNA virus.
B)  single-stranded RNA virus.
C)  single-stranded DNA virus.
D)  double-stranded RNA virus.
E)  prion.F) A) and B)
G) A) and C)

Exam 7: Dna Structure and Gene Function

HIV is a

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In a "silent" mutation

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Changes in gene expression can be adaptive,helping organisms contribute more to the next generation.

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The stage of viral replication in which the virus binds to a cell surface receptor is

Correct AnswerverifiedShow Answer

If the DNA in a cell consists of 20% adenine,then it will also contain ___ guanine.

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A cell can receive new genes from a virus and then produce a new set of proteins.

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Most viruses

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In eukaryotes,transcription copies only one gene from one DNA strand of the chromosome.

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The genetic information in viruses

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In DNA molecules,

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What type of mutation occurred in the following? Normal allele GGAAUGAAACAGGAACCC Mutant allele GGAAUGAAAUCAGGAACCC

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Many viruses are inhibited by antibiotics.

Correct AnswerverifiedShow Answer

In the lac operon,the protein that binds to the operator to prevent transcription is

Correct AnswerverifiedShow Answer

One key reason why viruses are not considered living organisms is

Correct AnswerverifiedShow Answer

In the bacterium E.coli,a repressor protein binds to the operator region of the DNA in the absence of lactose,thus preventing the transcription of the genes of the lactose operon.

Correct AnswerverifiedShow Answer

Initiation,elongation,and termination are the three main steps in

Correct AnswerverifiedShow Answer

The double helix of DNA is composed of building blocks called

Correct AnswerverifiedShow Answer

What type of RNA carries amino acids to the ribosome?

Correct AnswerverifiedShow Answer

Most antibiotics are not effective against viruses because they _____ and this does not affect the activity of viruses.

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HIV

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