Question 1

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 transcriptase

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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. A

Question 4

The process by which cells use the information of RNA to make proteins is called transcription.

Accepted Answer

A) True 
 B)False  False

Question 5

In eukaryotes,a mRNA molecule can only be translated by one ribosome at a time.

Accepted Answer

A) True 
 B)False

Question 6

The step of translation in which amino acids are added to the growing polypeptide is

Accepted Answer

A)  mitosis.
B)  initiation.
C)  elongation.
D)  termination.
E)  transcription.

Question 7

What is the genetic material found in HIV?

Accepted Answer

A)  protein
B)  RNA
C)  DNA
D)  lipid
E)  carbohydrate

Question 8

Many viruses are inhibited by antibiotics.

Accepted Answer

A) True 
 B)False

Question 9

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.

Question 10

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.

Question 11

RNA is made up of many

Accepted Answer

A)  nucleotides.
B)  amino acids.
C)  proteins.
D)  DNA molecules.

Question 12

In the section "Investigating Life: Clues to the Origin of Language",how did the researchers estimate that the original mutation occurred 300,000-400,000 years ago?

Accepted Answer

A)  They estimated by examining the fossil record.
B)  They estimated by using a molecular clock.
C)  They found the mutation in chimpanzee DNA.
D)  They found the mutation in Neandertal DNA.
E)  They found the mutation in 300,000 year old mice remains.

Question 13

The length of a DNA sequence is _____ than the mature mRNA transcribed from it,because

Accepted Answer

A)  shorter;it does not contain exons.
B)  equal;it was transcribed from the DNA sequence.
C)  longer;it does not contain introns.
D)  shorter;each codon of three bases encodes only one amino aciD.
E)  longer;each codon of one amino acid encodes three bases.

Question 14

The DNA sequence ATGCATGC will pair with which of the following DNA strands?

Accepted Answer

A)  TACGTACG
B)  TACCTACC
C)  ATGCATGC
D)  TTGCATCC
E)  CGTACGTA

Question 15

The stage of viral replication in which the new viruses leave the host cell is

Accepted Answer

A)  release
B)  attachment
C)  penetration
D)  synthesis
E)  assembly

Question 16

If one strand of DNA has the nitrogenous base sequence ATTCGACGCTA,then the complementary strand has the nitrogenous base sequence

Accepted Answer

A)  TAAGCTGCGAT.
B)  ATCGCAGCTTA.
C)  UAAGCUGCGAU.
D)  ATTCGACGCTA. A

Question 17

DNA is made up of many

Accepted Answer

A)  nucleotides.
B)  RNA molecules.
C)  proteins.
D)  amino acids.

Question 18

A three-base sequence (loop) in tRNA that is complementary to a three-base sequence in mRNA is

Accepted Answer

A)  a codon
B)  an anticodon
C)  a promoter
D)  a terminator
E)  an amino acid attachment site

Question 19

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years,and when a patient becomes stressed,the virus is released,forming cold sores on the lips.While lying dormant,the virus is in which of the following states?

Accepted Answer

A)  lytic
B)  symptomatic
C)  latent
D)  replicative
E)  infective

Question 20

The DNA sequence ATGCATGC will pair with which of the following RNA strands?

Accepted Answer

A)  UACGUACG
B)  CGAUCGAU
C)  AUGCAUGC
D)  TAGCTAGC
E)  UAGCTAGC

Exam 7: DNA Structure and Gene Function

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

The process by which cells use the information of RNA to make proteins is called transcription.

Correct AnswerverifiedFalse

In eukaryotes,a mRNA molecule can only be translated by one ribosome at a time.

Correct AnswerverifiedShow Answer

The step of translation in which amino acids are added to the growing polypeptide is

Correct AnswerverifiedShow Answer

What is the genetic material found in HIV?

Correct AnswerverifiedShow Answer

Many viruses are inhibited by antibiotics.

Correct AnswerverifiedShow Answer

Most viruses

Correct AnswerverifiedShow Answer

The genetic information in viruses

Correct AnswerverifiedShow Answer

RNA is made up of many

Correct AnswerverifiedShow Answer

In the section "Investigating Life: Clues to the Origin of Language",how did the researchers estimate that the original mutation occurred 300,000-400,000 years ago?

Correct AnswerverifiedShow Answer

The length of a DNA sequence is _____ than the mature mRNA transcribed from it,because

Correct AnswerverifiedShow Answer

The DNA sequence ATGCATGC will pair with which of the following DNA strands?

Correct AnswerverifiedShow Answer

The stage of viral replication in which the new viruses leave the host cell is

Correct AnswerverifiedShow Answer

If one strand of DNA has the nitrogenous base sequence ATTCGACGCTA,then the complementary strand has the nitrogenous base sequence

Correct AnswerverifiedA

DNA is made up of many

Correct AnswerverifiedShow Answer

A three-base sequence (loop) in tRNA that is complementary to a three-base sequence in mRNA is

Correct AnswerverifiedShow Answer

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years,and when a patient becomes stressed,the virus is released,forming cold sores on the lips.While lying dormant,the virus is in which of the following states?

Correct AnswerverifiedShow Answer

The DNA sequence ATGCATGC will pair with which of the following RNA strands?

Correct AnswerverifiedShow Answer

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