Question

1. which are units that make up proteins?

a fatty acids
b amino acids
c glucose molecules
d nucleotide molecules

1. which role do proteins play in the body?

a they provide long - term energy storage.
b they provide short - term energy storage.
c they provide structure to form dna and rna molecules.
d they provide structure for body tissue, hair, and fingernails.

1. waxes create a waterproof layer on the outside of some living organisms. to which group of organic molecules do waxes belong?

a carbohydrates
b lipids
c nucleic acids
d proteins

1. salivary amylase is an enzyme in humans that breaks down starches. what substance would humans have difficulty digesting without this enzyme?

a lipids
b nucleic acids
c proteins
d carbohydrates

Explanation:

1. Proteins are made up of amino acids. Fatty acids are part of lipids, glucose is a carbohydrate monomer, and nucleotides are part of nucleic acids.
2. Proteins provide structure for body tissue, hair, and fingernails. Long - term energy storage is from lipids, short - term from carbohydrates, and nucleic acids (DNA and RNA) are made of nucleotides.
3. Waxes belong to lipids. Carbohydrates include sugars and starches, nucleic acids are DNA and RNA, and proteins are made of amino acids.
4. Salivary amylase breaks down starches (a type of carbohydrate). Lipids are broken down by lipases, nucleic acids by nucleases, and proteins by proteases.

Answer:

1. B. amino acids
2. D. They provide structure for body tissue, hair, and fingernails.
3. B. lipids
4. D. carbohydrates