Chapter 8 Quiz Questions

Front 1

The initial effect of ionizing radiation on a cell is that it causes

a. Bonding between adjacent thymines.

b. The cells to get hot.

c. The formation of highly reactive ions.

d. DNA to break.

e. Base substitutions.

Back 1

The formation of highly reactive ions.

Front 2

The necessary ingredients for DNA synthesis can be mixed together in a test tube. The DNA polymerase is from Thermus aquaticus, and the template is from a human cell. The DNA synthesized would be most similar to

T. aquaticus DNA.

b. T. aquaticus RNA.

c. A mixture of human and T. aquaticus DNA.

d. Human DNA.

e. Human RNA.

Back 2

Human DNA.

Front 3

The mechanism by which the presence of arabinose controls the arabinose operon is

Select one:

a. Translation.

b. DNA polymerase.

c. Catabolite repression.

d. Induction.

Back 3

induction

Front 4

An enzyme produced in response to the presence of a substrate is called

Select one:

a. An operator.

b. A repressible enzyme.

c. An inducible enzyme.

d. A promoter.

e. A restriction enzyme.

Back 4

An inducible enzyme

Front 5

A gene is best defined as

Select one:

a. A segment of DNA.

b. A sequence of nucleotides in DNA that codes for a functional product.

c. Three nucleotides that code for an amino acid.

d. A transcribed unit of DNA.

e. A sequence of nucleotides in RNA that codes for a functional product.

Back 5

b. A sequence of nucleotides in DNA that codes for a functional product.

Front 6

Conjugation differs from reproduction because conjugation

Select one:

a. Transcribes DNA to RNA.

b. Copies RNA to make DNA.

c. Transfers DNA vertically, to new cells.

d. Transfers DNA horizontally, to cells in the same generation.

e. Replicates DNA.

Back 6

Transfers DNA horizontally, to cells in the same generation.

Front 7

In transcription,

Select one:

a. Proteins are made.

b. DNA is changed to RNA.

c. DNA is copied to RNA.

d. RNA is copied to DNA.

e. DNA is replicated.

Back 7

DNA is copied to RNA

Front 8

An enzyme that makes covalent bonds between nucleotide sequences in DNA is

Select one:

a. Transposase.

b. Restriction enzyme.

c. DNA ligase.

d. RNA polymerase.

Back 8

DNA ligase.

Front 9

If you knew the sequence of nucleotides within a gene, which one of the following could you determine with the most accuracy?

Select one:

a. The tertiary structure of the protein

b. The quaternary structure of the protein

c. The secondary structure of the protein

d. The primary structure of the protein

e. Can't tell

Back 9

The primary structure of the protein

Front 10

When glucose is high, cAMP is ________ : CAP ________ bind the lac operator, and RNA polymerase ________ bind the lac promoter.

Select one:

a. high, does, does

b. low, doesn't, doesn't

c. low, does, does

d. low, doesn't, doesn't

Back 10

low, doesn't, doesn't

Front 11

The mechanism by which the presence of glucose inhibits the arabinose operon is

a. Translation.

b. Catabolite repression.

c. DNA polymerase.

d. Induction.

e. Repression.

Back 11

Catabolite repression.

Front 12

An enzyme that copies DNA to make a molecule of RNA is

Select one:

a. RNA polymerase.

b. DNA ligase.

c. DNA polymerase.

d. Transposase.

e. Restriction enzyme.

Back 12

RNA polymerase

Front 13

In Figure 8.2, if base 4 is thymine, what is base 11'?

Select one:

a. Uracil

b. Thymine

c. Guanine

d. Cytosine

e. Adenine

Back 13

Thymine

Front 14

Protein synthesis in eukaryotes is similar to the process in prokaryotes in that both eukaryotes and prokaryotes

Select one:

a. Use codons to arrange amino acids.

b. Have exons.

c. Require snRNPS.

d. Use methionine as the "start" amino acid.

e. Have introns.

Back 14

Use codons to arrange amino acids.

Front 15

In Figure 8.2, if base 4 is thymine, what is base 4'?

Select one:

a. Uracil

b. Thymine

c. Guanine

d. Adenine

e. Cytosine

Back 15

Adenine

Front 16

In Figure 8.3, if enzyme A is an inducible enzyme,

Select one:

a. Compound A would bind to the repressor.

b. Compound B would bind to enzyme A.

c. Compound C would bind to the repressor.

d. Compound A would react with enzyme B.

e. Compound C would react with gene a.

Back 16

Compound A would bind to the repressor.

Front 17

In Figure 8.5, which model of the lac operon correctly shows RNA polymerase, lactose, and repressor protein when the structural genes are being transcribed?

Select one:

a. a

b. b

c. c

d. d

e. e

Back 17

d.

Front 18

Based on the information in Table 8.3, prostate cancer is probably the result of which kind of mutation?

Select one:

a. Frameshift

b. Analog

c. Nonsense

d. Missense

e. None of the above

Back 18

Nonsense

Front 19

Transformation is the transfer of DNA from a donor to a recipient cell

Select one:

a. By crossing over.

b. As naked DNA in solution.

c. By a bacteriophage.

d. By cell-to-cell contact.

e. By sexual reproduction.

Back 19

As naked DNA in solution.

Front 20

Which of the following statements about bacteriocins is false?

Select one:

a. Bacteriocins kill baceria.

b. The genes coding for them are on plasmids.

c. They cause food-poisoning symptoms.

d. Nisin is a bacteriocin used as a food preservative.

e. They can be used to identify certain bacteria.

Back 20

They cause food-poisoning symptoms.

Front 21

The damage caused by ultraviolet radiation is

Select one:

a. Cut out and replaced.

b. Never repaired.

c. Repaired during translation.

d. Repaired by DNA replication.

e. Repaired during transcription.

Back 21

Cut out and replaced.

Front 22

Synthesis of a repressible enzyme is stopped by

Select one:

a. The substrate binding to the repressor.

b. The corepressor-repressor binding to the operator.

c. The corepressor binding to the operator.

d. The allosteric transition.

e. The end-product binding to the promoter.

Back 22

The corepressor-repressor binding to the operator.

Front 23

Genetic change in bacteria can be brought about by

Select one:

a. Transformation.

b. Transduction.

c. Conjugation.

d. Mutation.

e. All of the above.

Back 23

. All of the above.

Front 24

Which of the following statements is false?

Select one:

a. DNA polymerase joins nucleotides in one direction only.

b. Multiple replication forks are possible on a bacterial chromosome.

c. The lagging strand of DNA is started by an RNA primer.

d. DNA replication proceeds in one direction around the bacterial chromosome.

e. The leading strand of DNA is made continuously.

Back 24

DNA replication proceeds in one direction around the bacterial chromosome.

Front 25

Which of the following is NOT a product of transcription?

Select one:

a. tRNA

b. mRNA

c. rRNA

d. A new strand of DNA

e. None of the above

Back 25

A new strand of DNA

Front 26

An enzyme that cuts double-stranded DNA at specific nucleotide sequences.

Select one:

a. DNA polymerase

b. DNA ligase

c. RNA polymerase

d. Restriction enzyme

e. Transposase

Back 26

Restriction enzyme

Front 27

Repair of damaged DNA might be viewed as a race between an endonuclease and

Select one:

a. DNA ligase.

b. Methylase.

c. DNA polymerase.

d. Primase.

e. Helicase.

Back 27

Methylase.

Front 28

The cancer gene ras produces mRNA containing an extra exon that includes a number of UAA codons. Cancer cells produce ras mRNA missing this exon. This mistake most likely is due to a mistake by

Select one:

a. Photolyases.

b. DNA polymerase.

c. UV radiation.

d. snRNPs.

e. A chemical mutagen.

Back 28

snRNPs.

Front 29

Which of the following statements is false regarding a bacterium that is R+?

Select one:

a. R+ can be transferred to a different species.

b. R+ can be transferred to a cell of the same species.

c. It possesses a plasmid.

d. It is resistant to certain drugs and heavy metals.

e. It is F+.

Back 29

It is F+.

Front 30

According to the operon model, for the synthesis of an inducible enzyme to occur, the

Select one:

a. Repressor must bind to the operator.

b. Substrate must bind to the enzyme.

c. End-product must not be in excess.

d. Repressor must not be synthesized.

e. Substrate must bind to the repressor.

Back 30

Substrate must bind to the repressor.