Which of the following is not characteristic of facilitated diffusion? A It moves substances against a concentration gradient. B It requires a carrier protein. C It involves a change in the shape of its carrier. D It requires no energy input.

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

How will you manage your time to accomplish the necessary tasks both on the job and at home?

What are two examples of conduction that we use everyday