What was once thought to be junk DNA is now known to
a. function as templates for building proteins.
b. control phenotypes.
c. regulate activity of other genes.
d. determine genotypes.
Question 2
Scientists estimate that the average human cell contains about _____ genes.
a. 200-250
b. 20,000-25,000
c. 200,000-250,000
d. 2,000,000-250,000,000