AnswersTX-Biology A-ACC RISD QuestDNA Mutations

DNA Mutations Answers

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1
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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.
2
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Which statement is scientifically based?

A
Mutations rarely occur.
B
All mutations are harmful.
C
Some mutations can be contagious, like infections.
D
Mutations are not passed from parent to offspring.
3

Which is considered a chemical mutagen?

A
tanning beds
B
tobacco
C
X-rays
D
sunlight
4

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.
5

Ji wants to write an example of a frameshift mutation using the following sentence: THE CAT SAW THE RAT. Which sentence best shows a frameshift mutation?

A
THC ATS AWT HER AT.
B
CAT THE SAW RAT THE.
C
EHT TAC WAS EHT TAR.
D
THE THE CAT SAW THE RAT.
6

Many different types of mutations can occur within the body. Tay-Sachs disease is a deadly disorder that is caused by a missing codon in the gene coding for production of the hex A enzyme in the body. Which type of mutation is responsible for causing Tay-Sachs disease?

A
substitution
B
replacement
C
insertion
D
deletion
7

Which best describes somatic mutations?

A
They are usually passed on to offspring.
B
They can cause different kinds of cancer.
C
They always result from point mutations.
D
They only occur in reproductive cells.
8

Which is a point mutation and not a frameshift mutation?

A
mutagen
B
insertion
C
deletion
D
silent
9

Which type of mutation always produces a stop codon?

A
missense
B
nonsense
C
silent
D
point
10

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

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