An N-terminus is the end of a(n) ____________________ that has a free amino group. Fill in the blank(s) with the appropriate word(s)

In the human diet, there are no "essential" ______ . 

A. amino acids B. vitamins C. fatty acids D. minerals E. carbohydrates

During the __________ epoch, the mammals experienced an explosive adaptive radiation

a. Holocene b. Paleocene c. Pleistocene d. Eocene e. Pliocene

What percentage of oxygen is transported by hemoglobin?

A) 75% B) 98.5% C) 86% D) 1.5% E) 5%

Crassulacean acid metabolism (CAM) is a form of photosynthesis that 

A. encourages the light-independent reactions to take place at night. B. allows photosynthesis to take place without water. C. encourages the light-dependent reactions to take place at night. D. allows photosynthesis to take place without carbon dioxide.