Question

36. what are the building blocks of carbohydrates?
a) monosaccharides
b) nucleotides
c) fatty acids
d) amino acids

37. what is the primary component of the cell membrane?
a) phospholipid bilayer
b) protein channels
c) carbohydrates
d) nucleic acids

38. in a phospholipid bilayer, which part of the phospholipid is hydrophobic?
a) fatty acid tails
b) phosphate head
c) proteins
d) both heads and tails

39. what is the function of the phospholipid bilayer in a cell?
a) to regulate what enters and leaves the cell
b) to synthesize proteins
c) to store genetic information
d) to produce energy

Explanation:

• For question 36: Monosaccharides are the simplest form of carbohydrates and are the building - blocks. Nucleotides are for nucleic acids, fatty acids for lipids, and amino acids for proteins.
• For question 37: The cell membrane's primary component is the phospholipid bilayer which forms a stable barrier. Protein channels are embedded in it, carbohydrates are on the surface for cell - cell recognition, and nucleic acids are not the main part of the cell membrane.
• For question 38: In a phospholipid, the fatty acid tails are non - polar and hydrophobic, while the phosphate head is hydrophilic. Proteins are not part of the basic structure of the phospholipid.
• For question 39: The phospholipid bilayer in a cell functions to regulate what enters and leaves the cell, creating a semi - permeable barrier. Protein synthesis occurs in ribosomes, genetic information is stored in nucleic acids, and energy production mainly occurs in mitochondria.

Answer:

1. a) Monosaccharides
2. a) Phospholipid bilayer
3. a) Fatty acid tails
4. a) To regulate what enters and leaves the cell