Question

1. which macromolecule is pictured below?

chemical structure diagram
a. carbohydrate
b. lipid
c. protein
d. nucleic acid
enzymes

1. an enzyme reaction is pictured above. which macromolecule are enzymes an example of?

enzyme reaction diagram
a. carbohydrate
b. lipid
c. protein
d. nucleic acid

1. in this reaction, what will happen to the enzyme (catalase) if the amount of substrate (hydrogen peroxide) keeps increasing?

$2\ce{h_2o_2} \xrightarrow{\text{catalase}} 2\ce{h_2o} + \ce{o_2}$
a. it will be used up, and more of the enzyme will be produced
b. it will be denatured by the hydrogen peroxide
c. it will be reused to break down the hydrogen peroxide

Explanation:

Question 10 (Which macromolecule is pictured?):

The structure shows a glycerol backbone with fatty acid chains, which is characteristic of lipids (triglycerides). Lipids have this structure with long hydrocarbon chains and ester linkages to glycerol, unlike carbohydrates (sugars/polysaccharides), proteins (amino acid chains), or nucleic acids (nucleotide chains).

Enzymes are mostly proteins (some RNA enzymes exist but are rare). Proteins have specific 3D structures (like the active site shown) and function as catalysts. Carbohydrates, lipids, and nucleic acids don’t primarily act as enzymes (except rare ribozymes, not the norm here).

Enzymes are reusable catalysts; they aren’t used up in reactions. Increasing substrate increases reaction rate until saturation, but enzymes remain to catalyze more reactions. Option a is wrong (enzymes aren’t used up), b is wrong (substrate doesn’t denature enzymes; factors like pH/temperature do), so c is correct as enzymes are reused.

Answer:

b. Lipid

Question 1 (Enzymes as macromolecule example):