1. Which is true, regarding DNA?
a. DNA contains nucleotides made of bases, phosphates, and ribose sugar.
b. DNA is always single-stranded when it is inside the nucleus.
c. DNA contains uracil but not thymine.
d. DNA contains thymine but not uracil.

2. An anticodon is _________________.
a. a three-nucleotide sequence of DNA
b. a three-nucleotide sequence of mRNA
c. a sequence of three amino acids
d. a three-nucleotide sequence attached to tRNA

3. Which protein adds nucleotides to a developing strand of mRNA?
a. DNA polymerase
b. RNA polymerase
c. DNA ligase
d. primase
e. helicase

4. Baldness in human males is an example of:
a. epistasis.
b. polygenic inheritance.
c. a sex-linked condition.
d. a sex-influenced condition.
e. an example of X inactivation.

5. Which of the following diseases is an example of a mitochondrial disease?
a. hemophilia A
b. Huntington disease
c. myopathy
d. phenylketonuria

6. Which of the following labrador retrievers is a "chocolate lab"?
a. BBEE
b. BbEe
c. bbee
d. bbEe

7. The location of a gene on a chromosome is called:
a. a locus.
b. a chiasma.
c. an allele.
d. a phenotype.

8. If a tt (short, homozygous recessive) pea plant is crossed with a Tt (tall, heterozygous dominant) pea plant, how many offspring in the F1 generation will be tall?
a. 0/4
b. 1/4
c. 2/4
d. 3/4
e. 4/4

Answers: d, d, b, d, c, d, a, c