Question

1. which structure makes up the major component of cell membranes? a. steroids b. phospholipids c. triglycerides d. waxes 3. which part of a phospholipid is hydrophobic? c. glycerol backbone d. enzyme group

Explanation:

Question 2:

Cell membranes are mainly composed of phospholipids, which form a bilayer structure. Steroids (like cholesterol) are present in smaller amounts, triglycerides are not a main component of cell membranes, and waxes have other functions and are not the main component of cell membranes.

A phospholipid has a hydrophilic head (containing the phosphate group) and hydrophobic tails. The tails are made of fatty acid chains, which are non - polar and thus hydrophobic. The glycerol backbone is part of the structure, but the fatty acid tails (not listed as an option here, but among the options, the fatty acid - like non - polar part which is the lipid tail region, and in the context of the options, the fatty acid chains (the non - polar part) which are hydrophobic. Wait, maybe the options were mis - transcribed. But typically, the fatty acid tails of a phospholipid are hydrophobic. If we assume the options were about the parts, and maybe a typo, but in standard phospholipid structure, the two fatty acid chains (the non - polar part) are hydrophobic. If the options were, for example, if there was an option of fatty acid tails, but in the given options (maybe miswritten), but if we consider the structure, the lipid (fatty acid) part is hydrophobic. Let's assume the question is about the phospholipid structure: the hydrophobic part is the fatty acid tails (the non - polar region). If the options were like (maybe a misprint), but in general, the two fatty acid chains in a phospholipid are hydrophobic.

Answer:

B. Phospholipids

Question 3: