Earth’s moon has a surface gravity equal to of earth’s surface gravity. a. one-sixth b. three-fourths c. one-half d. two-thirds

Which class of organic compounds makes up the channels and pumps that move materials from one side of the cell membrane to the other? a.) carbohydrates b.) lipids c.) proteins d.) nucleic acids

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Works together in the synthesis, modification, packaging, and transport of lipids and proteins