Multiple choice

1. Let T mean tall and t mean short. If Clara’s mother is Tt and her father is it, what is the chance that she’ll be tall?

A. 1 in 4

B. 2 in 4

C. 3 in 4

D. Zero

2. Which statement about Chargaff’s rules is correct?

A. In each species, the amount of adenine equals the amount of guanine.

B. In each species, the amount of adenine equals the amount of thymine.

C. In each species, the amount of adenine equals the amount of cytosine.

D. The amount of adenine, guanine, thymine, and cytosine is the same in every species.

3. Once the _______ checkpoint is passed in the cell cycles, the cell is committed 

to division.

A. M

B. G2

C. S

D. G1

4. A change in a single DNA nucleotide is called a

A. point mutation.

B. mutagen.

C. transposon.

D. ligase