Biology: Chapter 18- Genetics Of Viruses And Bacteria

Front 1

Which of the following forms of genetic material can be found in viruses?

A)Double stranded DNA

B)Single stranded DNA

C)Single stranded RNA

D)Double stranded DNA and single stranded RNA

E)Double stranded DNA, single stranded DNA, and single stranded RNA

Back 1

E

Front 2

All viruses have a protein coat called a(n) ________, and some viruses have an additional "covering" called a(n) ________.

A)inner membrane; outer membrane

B)shell; cortex

C)cell wall; plasma membrane

D)envelope; capsid

E)capsid; envelope

Back 2

E

Front 3

Which of the following statements about bacterial genomes is correct?

A)Bacterial genomes are typically linear double-stranded DNA molecules.

B)Some bacterial species have multiple copies of their genomes in their nucleus.

C)Replication of bacterial genomes is initiated from a single origin of replication.

Back 3

C

Front 4

Which of the following is a method of packing DNA into a bacterial cell?

A)Formation of loop domains

B)Supercoiling

C)Wrapping around histone proteins

D)Formation of loop domains and supercoiling

E)Formation of loop domains, supercoiling, and wrapping around histone proteins

Back 4

D

Front 5

Which of the following statements about plasmids is incorrect?

A)Some plasmids approach can carry hundreds of genes.

B)Replication of plasmid DNA is initiated from the origin of replication on the bacterial chromosome.

C)Plasmids confer selective advantage on the cells carrying them.

Back 5

C

Front 6

Phages are a form of virus that infect bacteria.

A)True

B)False

Back 6

A

Front 7

Which of the following is not a key category of plasmids?

A)Degradative

B)Resistance

C)Fertility

D)Defensive

E)Virulence

Back 7

D

Front 8

Bacterial cells that are capable of acting as conjugation donor cells possess a(n) ________, which recipient cells do not possess.

A)F factor

B)R factor

C)nucleoid

D)cell wall

E)capsid

Back 8

A

Front 9

During ____________________, direct contact is made between bacterial cells in order to transfer genetic material, whereas during _________________ genetic material is taken up directly from the surrounding environment.

A)transformation ; transduction.

B)conjugation ; transformation

C)transformation ; conjugation

D)conjugation ; transduction

E)transduction ; conjugation

Back 9

B

Front 10

Which of the following is not an example of horizontal gene transfer?

A)Transformation

B)Conjugation

C)Transduction

D)Vertical gene transfer

E)All of the choices are examples of horizontal gene transfer.

Back 10

D

Front 11

Viroids depend entirely on host cell enzymes for replication.

A)True

B)False

Back 11

A

Front 12

Arrange the following steps in a viral reproductive cycle in order from first to last.

I Integration

II Synthesis

III Assembly

IV Attachment

V Release

VI Entry

Back 12

IV, VI, I, II, III, V

Front 13

Temperate phages are able to incorporate their genetic material into the host cell genome and virulent phages cannot.

A)True

B)False

Back 13

A

Front 14

DNA produced by a virus by reverse transcriptase and is then integrated into the hosts DNA is most accurately described as a/an

A)phage.

B)viroid.

C)prophage.

D)provirus.

E)plasmid.

Back 14

D

Front 15

Temperate phages can be either lytic or lysogenic, but virulent phages can only be lytic.

A)True

B)False

Back 15

A

Front 16

Which of the following statements about human immunodeficiency virus (HIV) is incorrect?

A)It is widely accepted to be the causative agent of AIDS.

B)It is an example of an emerging virus.

C)It can be transmitted from mother to unborn child.

D)All of these statements about HIV are correct.

Back 16

D

Front 17

AZT inhibits the function of reverse transcriptase by?

A)Binding directly to the RNA template

B)Mimicking the DNA template

C)Mimicking normal nucleotide structure to bind directly to reverse transcriptase

D)Methylating host DNA where transcribed DNA may be integrated

E)Denaturing reverse transcriptase

Back 17

C

Front 18

RNA particles that infect plant cells are most accurately referred to as

A)phage.

B)retroviruses.

C)viroids.

D)prions.

E)lysogens.

Back 18

C

Front 19

A challenge to developing drugs against HIV is due to the fact that reverse transcriptase does not proofread, thereby resulting in a high mutational frequency.

A)True

B)False

Back 19

A

Front 20

Which one of the following statements about prions is incorrect?

A)Prions induce wild-type proteins to fold incorrectly.

B)Exposure to nucleic acid-damaging radiation renders a prion uninfectious.

C)Prions are widely accepted to be the causative agent of spongiform encephalopathies.

Back 20

B