Question 1

How many different codons are there?

Accepted Answer

A)  4 
B)  16 
C)  32 
D)  64 
E)  128 
A)  4 
B)  16 
C)  32 
D)  64 
E)  128

Question 2

Many ribosome-inactivating proteins are not a problem for humans because

Accepted Answer

A)  we have enzymes to detoxify them. 
B)  they are very rare in nature. 
C)  they are sequestered by white blood cells. 
D)  they are rapidly metabolized. 
E)  they do not cross cell membranes very well. 
A)  we have enzymes to detoxify them. 
B)  they are very rare in nature. 
C)  they are sequestered by white blood cells. 
D)  they are rapidly metabolized. 
E)  they do not cross cell membranes very well.

Question 3

Which of the following could NOT be an RNA transcript?

Accepted Answer

A)  GGCUAG 
B)  CCGATC 
C)  UUAACC 
D)  ACGGAU 
E)  GAGCAU 
A)  GGCUAG 
B)  CCGATC 
C)  UUAACC 
D)  ACGGAU 
E)  GAGCAU

Question 4

Which of the following functions do enzymes perform?

Accepted Answer

A)  assemble lipids 
B)  assemble carbohydrates 
C)  replicate DNA 
D)  make RNA 
E)  enzymes perform all of these functions 
A)  assemble lipids 
B)  assemble carbohydrates 
C)  replicate DNA 
D)  make RNA 
E)  enzymes perform all of these functions

Question 5

Which of the following is true of a methylation?

Accepted Answer

A)  the particular methylation is passed on in mitosis 
B)  chemicals in cigarette smoke remove methyl groups 
C)  methylation is never a random event 
D)  histones are immune to methylation 
E)  methylation is always harmful 
A)  the particular methylation is passed on in mitosis 
B)  chemicals in cigarette smoke remove methyl groups 
C)  methylation is never a random event 
D)  histones are immune to methylation 
E)  methylation is always harmful

Question 6

Epigenetics is most closely associated with which of the following?

Accepted Answer

A)  base-pair substitution 
B)  metylation 
C)  Barr bodies 
D)  hydrolysis 
E)  phosphorylation 
A)  base-pair substitution 
B)  metylation 
C)  Barr bodies 
D)  hydrolysis 
E)  phosphorylation

Question 7

Heritable changes in gene expression not due to changes in DNA sequences is termed

Accepted Answer

A)  epigenetics. 
B)  methylation. 
C)  translational mutation. 
D)  differentiation. 
E)  frameshift inheritance. 
A)  epigenetics. 
B)  methylation. 
C)  translational mutation. 
D)  differentiation. 
E)  frameshift inheritance.

Question 8

What do transcription factors do?

Accepted Answer

A)  speed up transcription 
B)  slow the rate of gene expression 
C)  stop gene expression completely 
D)  increase the amount of proteins produced 
E)  transcription factors do more than one of these 
A)  speed up transcription 
B)  slow the rate of gene expression 
C)  stop gene expression completely 
D)  increase the amount of proteins produced 
E)  transcription factors do more than one of these

Question 9

In RNA synthesis, thymine is complementary to

Accepted Answer

A)  guanine 
B)  adenine 
C)  cytosine 
D)  uracil 
E)  more than one of these 
A)  guanine 
B)  adenine 
C)  cytosine 
D)  uracil 
E)  more than one of these

Question 10

Transcription

Accepted Answer

A)  involves both strands of DNA as templates. 
B)  uses the enzyme DNA polymerase. 
C)  results in a double-stranded end product. 
D)  produces three different types of RNA molecules. 
E)  is true of all of these. 
A)  involves both strands of DNA as templates. 
B)  uses the enzyme DNA polymerase. 
C)  results in a double-stranded end product. 
D)  produces three different types of RNA molecules. 
E)  is true of all of these.

Question 11

What percent of our DNA actually codes for protein products?

Accepted Answer

A)  3 
B)  26 
C)  48 
D)  71 
E)  100 
A)  3 
B)  26 
C)  48 
D)  71 
E)  100

Question 12

The difference between normal and sickle-cell hemoglobin is based upon

Accepted Answer

A)  the number of amino acids in the molecule. 
B)  the substitution of one amino acid for another. 
C)  the number and orientation of the amino acid chain attached to the heme portion of the molecule. 
D)  the number of oxygen molecules that can be carried. 
E)  the types of bone marrow that produce it. 
A)  the number of amino acids in the molecule. 
B)  the substitution of one amino acid for another. 
C)  the number and orientation of the amino acid chain attached to the heme portion of the molecule. 
D)  the number of oxygen molecules that can be carried. 
E)  the types of bone marrow that produce it.

Question 13

Examine the figure above and answer the following question(s). In this representation of transcription, strand # ____ is ____ because it ____.

Accepted Answer

A)  2; RNA; is double-stranded 
B)  3; RNA; contains uracil 
C)  2; RNA; contains thymine 
D)  2; RNA; has no uracil 
E)  3; DNA; contains adenine 
A)  2; RNA; is double-stranded 
B)  3; RNA; contains uracil 
C)  2; RNA; contains thymine 
D)  2; RNA; has no uracil 
E)  3; DNA; contains adenine

Question 14

A Barr body exists for the purpose of

Accepted Answer

A)  protein dosage compensation. 
B)  insuring fertilization. 
C)  blocking the activity of the Y chromosome. 
D)  turning on the SRY gene. 
E)  activating master genes. 
A)  protein dosage compensation. 
B)  insuring fertilization. 
C)  blocking the activity of the Y chromosome. 
D)  turning on the SRY gene. 
E)  activating master genes.

Question 15

How many bases change during DNA replication?

Accepted Answer

A)  17.5 
B)  175 
C)  1750 
D)  17500 
E)  175000 
A)  17.5 
B)  175 
C)  1750 
D)  17500 
E)  175000

Question 16

Selecting the Exception Four of the five answers listed below are related to translation. Select the EXCEPTION.

Accepted Answer

A)  RNA polymerase 
B)  mRNA 
C)  tRNA 
D)  ribosome 
E)  amino acid 
A)  RNA polymerase 
B)  mRNA 
C)  tRNA 
D)  ribosome 
E)  amino acid

Question 17

Selecting the Exception Four of the five answers listed below are related to RNA synthesis. Select the EXCEPTION.

Accepted Answer

A)  nucleotides 
B)  thymine 
C)  RNA polymerase 
D)  messenger RNA 
E)  DNA 
A)  nucleotides 
B)  thymine 
C)  RNA polymerase 
D)  messenger RNA 
E)  DNA

Question 18

If the codon consisted of only 2 nucleotides there would be how many possible codons?

Accepted Answer

A)  4 
B)  8 
C)  16 
D)  32 
E)  64 
A)  4 
B)  8 
C)  16 
D)  32 
E)  64

Question 19

tRNA differs from other types of RNA because it

Accepted Answer

A)  acts as an enzyme. 
B)  is only involved in transcription. 
C)  carries amino acids. 
D)  codes for multiple amino acids. 
E)  is complexed with a protein. 
A)  acts as an enzyme. 
B)  is only involved in transcription. 
C)  carries amino acids. 
D)  codes for multiple amino acids. 
E)  is complexed with a protein.

Question 20

If an mRNA carries AUCGUG as a sequence, what would be the sequence of the DNA complement to the sequence of DNA that is the complement to the mRNA?

Accepted Answer

A)  ATCGTG 
B)  TCGCAC 
C)  CGATCT 
D)  GCTACA 
E)  UAGCAC 
A)  ATCGTG 
B)  TCGCAC 
C)  CGATCT 
D)  GCTACA 
E)  UAGCAC

Exam 7: Gene Expression and Control

How many different codons are there?

Many ribosome-inactivating proteins are not a problem for humans because

Which of the following could NOT be an RNA transcript?

Which of the following functions do enzymes perform?

Which of the following is true of a methylation?

Epigenetics is most closely associated with which of the following?

Heritable changes in gene expression not due to changes in DNA sequences is termed

What do transcription factors do?

In RNA synthesis, thymine is complementary to

Transcription

What percent of our DNA actually codes for protein products?

The difference between normal and sickle-cell hemoglobin is based upon

Examine the figure above and answer the following question(s). In this representation of transcription, strand # ____ is ____ because it ____.

A Barr body exists for the purpose of

How many bases change during DNA replication?

Selecting the Exception Four of the five answers listed below are related to translation. Select the EXCEPTION.

Selecting the Exception Four of the five answers listed below are related to RNA synthesis. Select the EXCEPTION.

If the codon consisted of only 2 nucleotides there would be how many possible codons?

tRNA differs from other types of RNA because it

If an mRNA carries AUCGUG as a sequence, what would be the sequence of the DNA complement to the sequence of DNA that is the complement to the mRNA?

Invitation to Biology

Molecules of Life

Cell Structure

Energy and Metabolism

Capturing and Releasing Energy

Dna Structure and Function

How Cells Reproduce

Patterns of Inheritance

Biotechnology

Evidence of Evolution

Processes of Evolution

Early Life Forms and the Viruses

Plants and Fungi

Animal Evolution

Population Ecology

Communities and Ecosystems

The Biosphere and Human Effects

Animal Tissues and Organs

How Animals Move

Circulation and Respiration

Immunity

Digestion and Excretion

Neural Control and the Senses

Endocrine Control

Reproduction and Development

Plant Form and Function

Plant Reproduction and Development

Filters

Examine the figure above and answer the following question(s). In this representation of transcription, strand # is because it .