How many amino acids cannot be made by the body, so they must be obtained in the diet?
a. 2
b. 5
c. 10
d. 20

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere