In the body, protein buffers are very important in . defending the body against bacteria and toxins. b. maintaining acid-base balance in the body. c. accelerating chemical reactions in the body. d. maintaining and repairing body tissue.

b. maintaining acid-base balance in the body.

Explanation:

The protein buffers are the most abundant buffers in intracellular fluid and blood plasma and maintain the acid-base balance of the body. Protein hemoglobin serves as a buffer within red blood cells, and albumin is the main protein buffer in blood plasma. Proteins are polymers of amino acids.

Amino acids have at least one carboxyl group (COOH) and at least one amino group (NH2) which in turn serve as functional components of the protein buffer system. The free carboxyl group of a protein acts as an acid and releases H+ when pH rises. The released H+ ions react with any excess OH− in the solution to form water.

On the other hand, the free amino group of a protein can act as a base by combining with H+ when pH falls. In this way, protein buffers maintain the acid-base balance.

100 dollars because yeah

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!