Unit Test — Unit test 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.
23

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.
24

Which occurs during transcription?

A
DNA is copied to create a second DNA strand.
B
mRNA codons and tRNA anticodons assemble amino acids.
C
DNA is unzipped with the aid of DNA polymerase.
D
mRNA is synthesized from a strand of DNA.

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