Question 1

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

Question 2

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. 
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.

Question 3

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. 
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.

Question 4

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. 
A) transposon. 
B) substitution mutation. 
C) carcinogen. 
D) oncogene. 
E) frameshift mutation.

Question 5

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. 
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.

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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. 
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.

Question 8

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. 
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.

Exam 13: Regulation of Gene Expression

All of these are considered carcinogens EXCEPT

Transposons

If a chromosome is highly methylated,

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

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

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

Frameshift mutations

Which statement is NOT correct about the lac operon?

A View of Life

Basic Chemistry

The Chemistry of Organic Molecules

Cell Structure and Function

Membrane Structure and Function

Metabolism: Energy and Enzymes

Photosynthesis

Cellular Respiration

The Cell Cycle and Cellular Reproduction

Meiosis and Sexual Reproduction

Mendelian Patterns of Inheritance

Molecular Biology of the Gene

Biotechnology and Genomics

Darwin and Evolution

How Populations Evolve

Speciation and Macroevolution

Origin and History of Life

Taxonomy,systematics,and Phylogeny

Viruses,bacteria,and Archaea

Protist Evolution and Diversity

Fungi Evolution and Diversity

Plant Evolution and Diversity

Flowering Plants: Structure and Organization

Flowering Plants: Nutrition and Transport

Flowering Plants: Control of Growth Responses

Flowering Plants: Reproduction

Invertebrate Evolution

Vertebrate Evolution

Human Evolution

Animal Organization and Homeostasis

Circulation and Cardiovascular Systems

The Lymphatic and Immune Systems

Digestive Systems and Nutrition

Respiratory Systems

Body Fluid Regulation and Excretory Systems

Neurons and Nervous Systems

Sense Organs

Locomotion and Support Systems

Hormones and Endocrine Systems

Reproductive Systems

Animal Development

Behavioral Ecology

Population Ecology

Community and Ecosystem Ecology

Major Ecosystems of the Biosphere

Conservation of Biodiversity

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