AnswersTX-Biology A-ACC RISD QuestDNA Mutations

DNA Mutations Answers

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A scientist thinks that a certain chemical is a mutagen. She exposes plant cells to a large amount of this chemical in the laboratory. Which statement best provides evidence that the substance is a mutagen?

A
The cells die within hours of being exposed to the chemical.
B
The cells grow more quickly than those that were not exposed to the chemical.
C
The cells change after being exposed to the chemical, and this change is passed to the next generation of cells.
D
The cells continue to divide at the same rate as before they were exposed to the chemical.
2
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Which is a point mutation and not a frameshift mutation?

A
mutagen
B
insertion
C
deletion
D
silent
3

The DNA sequence reads ACGTTCATT before a mutation occurs. After the mutation, the DNA sequence reads ATCGTTCATT. Which type of mutation occurred?

A
substitution
B
insertion
C
deletion
D
point
4

A point mutation changes the DNA sequence CGA to CGT, but the same protein is still produced. Which point mutation occurred?

A
nonsense
B
missense
C
silent
D
frameshift
5

Which best describes genetic mutations?

A
Some inherited genetic mutations can be good for the offspring.
B
Different genetic mutations cause few forms of cancer.
C
Somatic mutations can be inherited from parents or acquired during life.
D
Genetic mutations that cause diseases are always passed on to offspring.
6

Which type of mutation occurs only in reproductive cells?

A
somatic mutation
B
germline mutation
C
point mutation
D
frameshift mutation
7

Which is considered a chemical mutagen?

A
tanning beds
B
tobacco
C
X-rays
D
sunlight
8

Based on scientific research, which statement best describes mutations?

A
Mutations are rare occurrences.
B
Mutations are always harmful.
C
Mutations cannot be inherited.
D
Mutations cannot be acquired.
9

A mutagen is

A
a living thing that has undergone a mutation.
B
an agent that causes a mutation in DNA.
C
a mutation that has affected one gene.
D
any chemical that can poison living cells.
10

Which type of mutation occurs only in gametes?

A
germline mutation
B
somatic mutation
C
point mutation
D
frameshift mutation

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