TCSS Biology Sample Assessment Items
Unit 1 – Concept 2 Enzymes
SB1B. Explain how enzymes function as catalysts.
1. Which of the following best explains why enzymes are necessary for many cellular reactions?
A. Enzymes supply the oxygen necessary for the reactions.
B. Enzymes change reactants from solid to liquid during the reactions.
C. The reactions take up too much space in the cell if enzymes are missing.
D. The reactions are too slow to meet the needs of the cell if enzymes are missing.
2. Which most directly controls the rate at which food is broken down to release energy?
A. Enzymes
B. Hormones
C. Nucleic acids
D. Vitamins
3.
4.
5. Enzymes are proteins that help increase the rate of chemical reactions inside cells. These
proteins are composed of many simpler molecules called amino acids. Which of the following
suggests that the shape of an enzyme determines the enzyme’s function?
F Enzymes are specific to a substrate.
G Enzymes can operate in a wide range of conditions.
H Enzymes are activated by neighboring molecules.
J Enzymes can be found in all life-forms.