DNA Mutations

Question 1

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?

Revolt · Accepted Answer

The cells change after being exposed to the chemical, and this change is passed to the next generation of cells.

Question 2

Which is a point mutation and not a frameshift mutation?

Revolt · Accepted Answer

silent

Question 3

Which type of mutation occurs only in gametes?

Revolt · Accepted Answer

germline mutation

Question 4

Which statement is scientifically based?

Revolt · Accepted Answer

Mutations rarely occur.

Question 5

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

Revolt · Accepted Answer

insertion

Question 6

Which is considered a chemical mutagen?

Revolt · Accepted Answer

tobacco

Question 7

A mutagen is

Revolt · Accepted Answer

an agent that causes a mutation in DNA.

Question 8

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?

Revolt · Accepted Answer

THC ATS AWT HER AT.

Question 9

Many different types of mutations can occur within the body. Sickle cell anemia is a disease that occurs when a mutation in a base pair of the hemoglobin beta gene causes a single replacement of the amino acid glutamic acid by the amino acid valine. As a result of this mutation, the individual’s blood cells take on a sickle shape under certain conditions and form clusters that can block blood vessels and cause organ damage. Which type of mutation causes sickle cell anemia?

Revolt · Accepted Answer

missense

Question 10

Which type of mutation always produces a stop codon?

Revolt · Accepted Answer

nonsense

DNA Mutations Answers

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