Question

Students are studying how mutations in DNA that result from external factors called mutagens can affect an organism. They consider changes that happen to DNA and the possible causes of those mutations.

Information
A picture shows a DNA strand with lettered nucleotide pairs. Mutagens from outside of the strand change a few of the nucleotide pair letters.

Question
Which ,begin emphasis,three,end emphasis, statements describe how mutations in DNA can occur?

Answer options with 5 options
A.
Radiation from the Sun alters the DNA coding, which results in a new trait in the organism.

B.
Radiation from the Sun alters cell structure, which results in a new DNA code and new, abnormal traits.

C.
Inhalation of chemical pollutants in the air alters cell respiration, which produces a new, abnormal protein.

D.
Exposure to chemical pollutants alters the base sequences in DNA, which introduces a new, abnormal trait in the organism.

E.
Carcinogenic compounds in cigarettes alter amino acid sequences, which introduces a new, abnormal protein in the organism.

Answer 1

The three statements that describe how mutations in DNA can occur are:

A. Radiation from the Sun alters the DNA coding, which results in a new trait in the organism.

D. Exposure to chemical pollutants alters the base sequences in DNA, which introduces a new, abnormal trait in the organism.

E. Carcinogenic compounds in cigarettes alter amino acid sequences, which introduces a new, abnormal protein in the organism.

These options all reference external factors (mutagens) causing changes in DNA or proteins, leading to new or abnormal traits.