Lab: Building Proteins from RNA — Unit test Answers

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21
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What does DNA provide the code for?

A
nitrogenous base pairing
B
protein synthesis
C
deoxyribose formation
D
nucleotide synthesis
22
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A mutation causes a sequence of DNA that has the nucleotides TTG to be changed to TCG. The resulting protein has a different sequence of amino acids. Which type of mutation is this?

A
missense
B
nonsense
C
silent
D
frameshift
23

Which accurately describes the relationship between cancer risk and exposure to mutagens?

A
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutation decreases as well.
B
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations increases as well.
C
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations decreases considerably.
D
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutations increases considerably.
24

Missense, nonsense, and silent mutations are examples of which type of mutation?

A
substitution
B
insertion
C
deletion
D
replication
25

Which of the following difference between DNA and RNA allows them to perform their unique functions?

A
DNA contains ribose, while RNA contains deoxyribose.
B
DNA is single-stranded, whereas RNA is double-stranded.
C
DNA contains thymine, while RNA contains uracil.
D
RNA is found only in the nucleus, while DNA is found only in the cytoplasm.
26

Many different types of mutations can occur within the body. An individual experiences a mutation that changes a base in a mRNA strand, but during translation the mRNA strand still creates the same protein. Which type of mutation is responsible for the change in the mRNA base?

A
silent
B
missense
C
nonsense
D
insertion
27

Which does not occur during translation?

A
tRNA pairs with complementary mRNA.
B
Met-tRNA binds to the start codon.
C
DNA is transcribed into a complementary strand of mRNA.
D
A chain of amino acids, linked by peptide bonds, is formed.
28

The structure of DNA resembles a twisted ladder. Which structural components form the rungs of the ladder?

A
deoxyribose sugars
B
phosphate groups
C
nitrogenous base pairs
D
ribosomes
29

Francois Jacob and Jacques Monod studied Escherichia coli (E. coli) bacteria by using lab experimentation. What revision to their initial hypothesis did they come up with?

A
The lac operon is repressed by allolactose.
B
E. coli are unable to process lactose sugar.
C
All E. coli operons are always turned on.
D
Two operons regulate gene control in E. coli.
30

Which is not something that occurs in translation?

A
A codon and an anticodon pair.
B
A peptide bond is created.
C
A molecule of mRNA is formed.
D
An amino acid is added to a polypeptide.

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