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Enzymes
Test Description: BIO.A.2.3 Explain how enzymes regulate biochemical reactions within a cell
Instructions: Answer all questions to get your test result.
1) Because they speed up the rates of chemical reactions, enzymes are known as BIOLOGICAL
A
chemicals
B
rapids
C
reactors
D
catalysts
2) Enzymes are globular proteins. Which of the following accurately identifies the structure of enzymes?
A
primary
B
quaternary
C
tertiary
D
both tertiary and quaternary
3) High temperatures and extreme pH environments cause the globular structure to unfold during
A
deconstruction
B
denaturation
C
transformation
D
unraveling
4) Molecules that are acted on by enzymes specifically known as
A
substrates
B
solutions
C
solvents
D
solutes
5) The _________ is the region on an enzyme to which a substrate binds during an enzyme-catalyzed reaction.
A
action site
B
active site
C
allosteric
D
activation site
6) Which of the following is NOT a factor that affects the rate of enzymatic reactions?
A
substrate concentration
B
time
C
temperature
D
pH
7) Enzymes speed up the rates of chemical reactions by lowering
A
thermal energy
B
kinetic energy
C
activation energy
D
potential
8) What structure is formed once a substrate binds to the active site of the enzyme?
A
substrate-active site complex
B
enzyme-substrate complex
C
active enzyme complex
D
enzyme-active site complex
9) What are substrates transformed into and released as during an enzyme-catalyzed reaction?
A
reactants
B
products
C
solutions
D
catalysts
10) Enzymes are changed during enzyme-catalyzed reactions.
A
True
B
False
11) In addition to temperature, pH, and substrate concentration, what else affects the rate of enzymatic reactions?
A
solutes
B
reactants
C
inhibitors
D
exhibitors
12) To what category of biological macromolecules do enzymes belong?
A
carbohydrates
B
nucleic acids
C
lipids
D
proteins
13) Which of the following describes enzyme action as lock and key and induced fit?
A
laws
B
models
C
hypotheses
D
theories
14) What word describes the fact that an enzyme only acts on certain substrates?
A
selectively permeable
B
relationship
C
semipermeable
D
specificity
15) What do we call molecules that bind to enzymes but block their activity?
A
inhibitors
B
exhibitors
C
blockers
D
non-enzymes
*select an answer for all questions
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