BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Enzymes are proteinaceous structures that can be embedded in cell membranes (integral membrane proteins), loosely associated with membranes (peripheral membrane proteins), free-floating in intracellular fluid (cytosolic), or secreted outside the cell (extracellular). Therefore, the answer is false.

Detailed explanation-2: -Enzymes in the membrane can do the same thing they do in the cytoplasm of a cell: transform a molecule into another form. Anchor proteins can physically link intracellular structures with extracellular structures.

Detailed explanation-3: -Red blood cell plasma membranes contain a number of enzymes: ATPases, anion transport protein, glyceraldehyde 3-phosphate dehydrogenase, protein kinases, adenylate cyclase, acetylcholinesterase. Most of them are tightly bound to the membrane and are present in small amounts.

Detailed explanation-4: -All enzymes are a type of protein. As a result, a membrane protein that is embedded into the membrane can sometimes be an enzyme, which may have its active site facing substances outside of the lipid bilayer.

Detailed explanation-5: -Membrane proteins account for about half the mass of a plasma membrane. All membrane proteins span both layers of the membrane. Membrane proteins are the primary contributors to membrane fluidity. All membrane proteins facilitate molecular transport across the bilayer.