Question 1

A deletion of one base pair that alters the sequence of codons is called a(n)

Accepted Answer

A)  transposon.
B)  substitution mutation.
C)  carcinogen.
D)  oncogene.
E)  frameshift mutation.F) All of the above
G) A) and D)

Question 2

Human red blood cells can live from two to four months without a nucleus and yet they continue to synthesize hemoglobin.This

Accepted Answer

A)  means that the necessary mRNAs are able to persist all this time.
B)  suggests that there is a low level of ribonucleases to degrade the mRNA.
C)  is a chemical process that does not require continued living pathways.The red blood cells are essentially dead after they lose their nuclei.
D)  All of the choices are true.
E)  Only two of the choices are correct.F) B) and E)
G) A) and B)

Question 3

Frameshift mutations

Accepted Answer

A)  most often happen when one or more nucleotides are inserted or deleted from the DNA.
B)  can result in a completely new codon sequence that results in the production of non-functional proteins.
C)  applies to the reading frame (sequence of codons) being changed.
D)  All of the choices are correct.E) A) and D)
F) None of the above

Question 4

Which statement is NOT correct about the lac operon?

Accepted Answer

A)  It regulates the production of a series of five enzymes.
B)  It is normally turned off if glucose is present.
C)  Lactose binds to the repressor protein and inactivates it.
D)  It is an inducible system.
E)  The structural genes make products that allow lactose metabolism.F) B) and E)
G) A) and C)

Question 5

If a chromosome is highly methylated,

Accepted Answer

A)  the gene is expressed,producing more gene product than normal.
B)  the gene is not expressed,even if it is a normal gene in every other way.
C)  the gene is expressed,but reduced quantities protein are made.
D)  there is no affect on gene expression.E) All of the above
F) A) and D)

Question 6

Transposons

Accepted Answer

A)  are specific DNA sequences that move within and between chromosomes.
B)  alter the expression of neighboring genes especially if the transposon is a regulator gene.
C)  have been discovered in corn,fruit flies,bacteria,and humans.
D)  All of the choices are correct.E) None of the above
F) A) and D)

Question 7

One third of all cancer deaths are due to mutations that arise from smoking tobacco.

Accepted Answer

A) True 
 B)False

Question 8

All of these are considered carcinogens EXCEPT

Accepted Answer

A)  cigarette smoke.
B)  ultraviolet light.
C)  cabbage and related vegetables.
D)  acrylamide,a natural product found in French fries.
E)  mold produced aflatoxin.F) A) and B)
G) C) and E)

Exam 13: Regulation of Gene Expression

Transposons

Correct Answer
verified

All of these are considered carcinogens EXCEPT

Correct Answer
verified

Human red blood cells can live from two to four months without a nucleus and yet they continue to synthesize hemoglobin.This

Correct Answer
verified

Which statement is NOT correct about the lac operon?

Correct Answer
verified

A deletion of one base pair that alters the sequence of codons is called a(n)

Correct Answer
verified

Frameshift mutations

Correct Answer
verified

If a chromosome is highly methylated,

Correct Answer
verified

One third of all cancer deaths are due to mutations that arise from smoking tobacco.

Correct Answer
verified

Exam 13: Regulation of Gene Expression

Transposons

Correct AnswerverifiedShow Answer

All of these are considered carcinogens EXCEPT

Correct AnswerverifiedShow Answer

Human red blood cells can live from two to four months without a nucleus and yet they continue to synthesize hemoglobin.This

Correct AnswerverifiedShow Answer

Which statement is NOT correct about the lac operon?

Correct AnswerverifiedShow Answer

A deletion of one base pair that alters the sequence of codons is called a(n)

Correct AnswerverifiedShow Answer

Frameshift mutations

Correct AnswerverifiedShow Answer

If a chromosome is highly methylated,

Correct AnswerverifiedShow Answer

One third of all cancer deaths are due to mutations that arise from smoking tobacco.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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