Question 1

The "central dogma" of molecular biology described by Watson and Crick describes

Accepted Answer

A)   the passing of genetic information from DNA to RNA by translation.
B)   the passing of genetic information from RNA to protein by transcription.
C)   the inheritance of traits between generations.
D)   the production of energy in a cell.
E)   the directional flow of genetic information in cells.F) A) and D)
G) A) and E)

Question 2

In studies of the genetic basis of language,FOXP2 sequences differed the most between mice and

Accepted Answer

A)   rhesus monkeys.
B)   gorillas.
C)   chimpanzees.
D)   humans.
E)   All answers are correct.F) A) and B)
G) A) and C)

Question 3

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.F) B) and C)
G) A) and C)

Question 4

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 5

In eukaryotic cells,sequences of mRNA removed before translation are called

Accepted Answer

A)   introns.
B)   anticodons.
C)   exons.
D)   rRNA.
E)   terminators.F) D) and E)
G) A) and E)

Question 6

If E.coli bacteria are grown in the absence of lactose

Accepted Answer

A)   the repressor will not bind the operator, thus allowing transcription of the lac operon genes.
B)   the repressor will bind the operator, thus allowing transcription of the lac operon genes.
C)   the repressor will not bind the operator, thus preventing transcription of the lac operon genes.
D)   the repressor will bind the operator, thus preventing transcription of the lac operon genes.
E)   No answer is correct.F) B) and D)
G) B) and E)

Question 7

An infectious protein is a

Accepted Answer

A)   virus.
B)   viroid.
C)   prion.
D)   virion.
E)   prophage.F) A) and D)
G) B) and E)

Question 8

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) B) and C)

Question 9

If the DNA in a cell consists of 20% adenine,it will also have ________ thymine.

Accepted Answer

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

Question 10

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.F) B) and E)
G) D) and E)

Question 11

If genetic tests showed that a tomato plant had viral DNA integrated into its chromosomes without outward symptoms caused by the virus,you could say that the tomato plant had

Accepted Answer

A)   a rare form of viral infection.
B)   a transgenic infection.
C)   a lytic infection.
D)   a systematic infection.
E)   a lysogenic infection.F) B) and E)
G) B) and D)

Question 12

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) A) and E)
G) A) and C)

Question 13

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) All of the above
G) B) and D)

Question 14

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.When a patient becomes stressed the virus is released,forming cold sores on the lips.Why would the virus form a cold sore?

Accepted Answer

A)   to spread to a new host
B)   so that it can mutate and survive antibiotic treatment
C)   to become latent in the body
D)   to avoid the immune system
E)   to warn other people that the host is infectedF) A) and B)
G) A) and D)

Question 15

Mutations can be caused by chemicals.

Accepted Answer

A) True 
 B)False

Question 16

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.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)   infectiveF) A) and E)
G) A) and C)

Question 17

Amanatin is a toxin found in the death cap mushroom,Amanita phalloides.It inhibits RNA polymerase,thus blocking

Accepted Answer

A)   transcription.
B)   translation.
C)   replication.
D)   cell division.
E)   RNA splicing.F) A) and B)
G) A) and C)

Question 18

The stage of viral replication in which the host cell produces viral nucleic acids and proteins is

Accepted Answer

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

Question 19

Where is the majority of DNA located in a human cell?

Accepted Answer

A)   nucleus
B)   mitochondrion
C)   chloroplast
D)   ribosomeE) A) and B)
F) A) and C)

Question 20

Many viruses are inhibited by antibiotics.

Accepted Answer

A) True 
 B)False

Exam 7: DNA Structure and Gene Function

The stage of viral replication in which the host cell produces viral nucleic acids and proteins is

Correct AnswerverifiedShow Answer

If genetic tests showed that a tomato plant had viral DNA integrated into its chromosomes without outward symptoms caused by the virus,you could say that the tomato plant had

Correct AnswerverifiedShow Answer

The "central dogma" of molecular biology described by Watson and Crick describes

Correct AnswerverifiedShow Answer

Amanatin is a toxin found in the death cap mushroom,Amanita phalloides.It inhibits RNA polymerase,thus blocking

Correct AnswerverifiedShow Answer

In DNA molecules,

Correct AnswerverifiedShow Answer

Many viruses are inhibited by antibiotics.

Correct AnswerverifiedShow Answer

If the DNA in a cell consists of 20% adenine,it will also have ________ thymine.

Correct AnswerverifiedShow Answer

Mutations can be caused by chemicals.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

One key reason why viruses are not considered living organisms is

Correct AnswerverifiedShow Answer

HIV is a

Correct AnswerverifiedShow Answer

Where is the majority of DNA located in a human cell?

Correct AnswerverifiedShow Answer

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.When a patient becomes stressed the virus is released,forming cold sores on the lips.Why would the virus form a cold sore?

Correct AnswerverifiedShow Answer

In eukaryotic cells,sequences of mRNA removed before translation are called

Correct AnswerverifiedShow Answer

If E.coli bacteria are grown in the absence of lactose

Correct AnswerverifiedShow Answer

An infectious protein is a

Correct AnswerverifiedShow Answer

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

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.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

In studies of the genetic basis of language,FOXP2 sequences differed the most between mice and

Correct AnswerverifiedShow Answer

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