Because of James Hutton's idea, Darwin concluded that A. The earth is ancient

B. The earth is only a few thousand years old

C. That natural selection occurred

D. That fossils are old

Charles Lyell’s contribution to Darwins thinking was that

A. Turtles change over time

B. Use and disuse

C. fossils show evolution

D. That the earth geology has been changing since ancient times and still changing

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

Omg substrates with the same size and shape as the active site will bind to the enzyme. why is the key labeled the “bad” substrate?

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit. there is a precise compatibility between the active site and the lactose molecule. specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed. reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.