The enzymes catalase and malate dehydrogenase are both classified as oxidoreductases. Catalase has a heme group present at its catalytic site, whereas malate dehydrogenase has no bound cofactors or prosthetic groups and uses NAD as a coenzyme. What can you infer about these two enzymes

one uses metal ion catalysis, while the other uses a nonmetal group to transfer electrons

Explanation:

A prosthetic group is a non-peptide (non-protein) component of a conjugated protein, which is covalently linked to the protein and is required for its activity. A heme group is a prosthetic group composed of a protoporphyrin ring and an iron atom in the center. Catalase is a tetramer composed of 4 heme groups which allow the enzyme to react with hydrogen peroxide (H2O2) in order to catalyze its decomposition to water (H2O) and oxygen (O2). Moreover, a cofactor is a non-protein compound and/or metallic ion that is required by an enzyme for its activity. Nicotinamide adenine dinucleotide (NAD) is a coenzyme involved in oxidation-reduction chemical reactions by carrying electrons from one reaction to another. NAD exists in two different states: an oxidized state (NAD+) and a reduced state (NADH, H for hydrogen).

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!