Question 1

DNA Polymerase III

Accepted Answer

A)  Synthesizes primer
B)  Removes primer
C)  Joins Okazaki fragments
D)  Unzips the DNA helix
E)  Proofreads new DNAF) C) and D)
G) B) and D)

Question 2

The site where the old DNA strands separate and new DNA strands will be synthesized is called the

Accepted Answer

A)  Primer
B)  Okazaki fragment
C)  Template
D)  Rolling circle
E)  Replication forkF) A) and B)
G) All of the above

Question 3

Synthesis of a repressible enzyme is inhibited by

Accepted Answer

A)  Repressor alone bound to operator
B)  Substrate bound to repressor
C)  Substrate bound to promoter
D)  Corepressor and repressor binding to operator
E)  None of the choices are correctF) A) and B)
G) A) and C)

Question 4

Which of the following is not true of an organism's genotype?

Accepted Answer

A)  Is inherited
B)  Are structural genes coding for proteins
C)  Are genes coding for RNA
D)  Are regulatory genes controlling gene expression
E)  Are the expressed traits governed by the genesF) A) and B)
G) A) and C)

Question 5

DNA gyrase

Accepted Answer

A)  Unwinds DNA
B)  Supercoils DNA
C)  Cleaves DNA
D)  Joins free DNA ends
E)  None of the choices are correctF) B) and D)
G) A) and B)

Question 6

Which of the following is not associated with a prokaryotic ribosome?

Accepted Answer

A)  Is a 70s
B)  Has a peptide (P)  site
C)  Has an exit site
D)  Small unit provides the enzymes for making peptide bonds
E)  Has an amino acid (
A)   siteF) B) and C)
G) A) and D)

Question 7

Excised introns form structures called lariats.

Accepted Answer

A) True 
 B)False  True

Question 8

A sequence of bases on a gene that does not code for protein is called a/an

Accepted Answer

A)  Promoter
B)  Operator
C)  Operon
D)  Exon
E)  IntronF) A) and E)
G) B) and C)

Question 9

Which of the following is not true of transposons?

Accepted Answer

A)  Can change pigmentation
B)  Can replace damaged DNA
C)  Can transfer drug resistance
D)  Can change the genome
E)  Are always part of plasmidsF) None of the above
G) A) and B)

Question 10

The enzyme that can proofreads replicating DNA, detects incorrect bases, excises them, and correctly replaces them is

Accepted Answer

A)  DNA ligase
B)  DNA polymerase
C)  DNA helicase
D)  DNA gyrase
E)  PrimaseF) C) and D)
G) B) and E)

Question 11

Induced mutations result from errors in DNA replication.

Accepted Answer

A) True 
 B)False

Question 12

If a codon for alanine is GCA, then the anticodon is

Accepted Answer

A)  GCA
B)  CGT
C)  ACG
D)  CGU
E)  UGCF) B) and D)
G) None of the above

Question 13

Which is incorrect about inducible operons?

Accepted Answer

A)  Have genes turned off by a buildup of end product
B)  Are often for catabolic pathways
C)  Are normally turned off
D)  Are turned on by the substrate of the enzyme
E)  Include the lac operonF) A) and B)
G) A) and C)

Question 14

All mutations are harmful to the cell.

Accepted Answer

A) True 
 B)False

Question 15

The gene of an operon that codes for a protein repressor is called the

Accepted Answer

A)  Operator
B)  Structural locus
C)  Regulator
D)  Promoter
E)  None of the choices are correctF) A) and C)
G) All of the above C

Question 16

DNA polymerase III

Accepted Answer

A)  Is needed for adding nucleotides during mRNA synthesis
B)  Synthesizes new DNA only in the 5' to 3' direction
C)  Cannot add nucleotides to the lagging strand
D)  Synthesizes an RNA primer
E)  All of the choices are correctF) A) and B)
G) B) and C)

Question 17

In bacteria, initiator tRNA carries formyl methionine.

Accepted Answer

A) True 
 B)False

Question 18

During replication, each parent DNA strand serves as a _____ for synthesis of new DNA strands.

Accepted Answer

A)  Copy point
B)  Template
C)  Comparison molecule
D)  Scaffold
E)  ReservoirF) A) and B)
G) A) and E)

Question 19

A primer of ____ is needed at the origin of nucleotide addition.

Accepted Answer

A)  Polymerase III
B)  Polymerase I
C)  Helicase
D)  RNA
E)  DNAF) A) and C)
G) All of the above

Question 20

The expression of genetic traits is the

Accepted Answer

A)  Genome
B)  Genotype
C)  Proteome
D)  Phenotype
E)  ProteotypeF) C) and E)
G) A) and B) D

Exam 9: An Introduction to Microbial Genetics

DNA Polymerase III

Correct AnswerverifiedShow Answer

The site where the old DNA strands separate and new DNA strands will be synthesized is called the

Correct AnswerverifiedShow Answer

Synthesis of a repressible enzyme is inhibited by

Correct AnswerverifiedShow Answer

Which of the following is not true of an organism's genotype?

Correct AnswerverifiedShow Answer

DNA gyrase

Correct AnswerverifiedShow Answer

Which of the following is not associated with a prokaryotic ribosome?

Correct AnswerverifiedShow Answer

Excised introns form structures called lariats.

Correct AnswerverifiedTrue

A sequence of bases on a gene that does not code for protein is called a/an

Correct AnswerverifiedShow Answer

Which of the following is not true of transposons?

Correct AnswerverifiedShow Answer

The enzyme that can proofreads replicating DNA, detects incorrect bases, excises them, and correctly replaces them is

Correct AnswerverifiedShow Answer

Induced mutations result from errors in DNA replication.

Correct AnswerverifiedShow Answer

If a codon for alanine is GCA, then the anticodon is

Correct AnswerverifiedShow Answer

Which is incorrect about inducible operons?

Correct AnswerverifiedShow Answer

All mutations are harmful to the cell.

Correct AnswerverifiedShow Answer

The gene of an operon that codes for a protein repressor is called the

Correct AnswerverifiedC

DNA polymerase III

Correct AnswerverifiedShow Answer

In bacteria, initiator tRNA carries formyl methionine.

Correct AnswerverifiedShow Answer

During replication, each parent DNA strand serves as a _____ for synthesis of new DNA strands.

Correct AnswerverifiedShow Answer

A primer of ____ is needed at the origin of nucleotide addition.

Correct AnswerverifiedShow Answer

The expression of genetic traits is the

Correct AnswerverifiedD

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True

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C

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D