Which of the following best shows how primary structure relates to protein function?
a. high temperatures cause proteins to denature.
b. changing one amino acid in the protein hemoglobin causes sickle-cell anemia.
c. proteins are sensitive to changes in ph.
d. the shape and chemistry of an enzyme's active site determine its function.

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

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f