Unit Test — Unit test Answers

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21
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Which base is found only in DNA?

A
adenine
B
guanine
C
cytosine
D
thymine
22
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Which base is found only in DNA?

A
adenine
B
guanine
C
cytosine
D
thymine
23

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
24

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.
25

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
26

Which best describes a codon?

A
a cell structure that gives the master instructions for an organism
B
a segment of DNA that is the basis of heredity in organisms
C
the sequence of three bases that codes for a specific amino acid
D
the basic unit of structure and function of all living things
27

Which flow chart correctly organizes the structures of heredity, from least to most complex?

A
codon ® gene ® DNA ® chromosome
B
gene ® chromosome ® codon ® DNA
C
DNA ® codon ® chromosome ® gene
D
chromosome ® DNA ® gene ® codon
28

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

A
substitution
B
insertion
C
deletion
D
replication
29

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.

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