Question

test name: bio_us01_u01_py26
test id: 3645064

1. which of the following best describes how metalloproteinase functions?

(a) it regulates a chemical reaction.
(b) it is a product of a chemical reaction.
(c) it is a reactant in a chemical reaction.
(d) it provides the energy for a chemical reaction.

1. which category of macromolecules does collagen belong to?

(a) carbohydrates
(b) lipids
(c) nucleic acids
(d) proteins

1. which of the following is a characteristic shared by all the molecules described in this passage?

(a) they all contain at least one fatty acid.
(b) they all contain unique r - groups.
(c) they all contain carbon.
(d) they all contain nitrogen.

Explanation:

1. Metalloproteinases are enzymes. Enzymes regulate chemical reactions by lowering the activation - energy. They are neither products, reactants, nor energy - providers for reactions.
2. Collagen is a fibrous protein that provides structural support in connective tissues. It is not a carbohydrate, lipid, or nucleic acid.
3. Organic molecules (which are commonly discussed in biology) all contain carbon. Not all contain fatty acids (e.g., proteins), unique R - groups (only amino acids in proteins have them), or nitrogen (e.g., carbohydrates).

Answer:

1. A. It regulates a chemical reaction.
2. D. proteins
3. C. They all contain carbon.