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Oxygen, carbon dioxide, and other small molecules cross the plasma membrane through the process of ____.
a. osmosis
b. facilitated diffusion
c. endocytosis and exocytosis
d. active transport
e. diffusion
4 points
QUESTION 2
The minimum amount of energy needed to get a chemical reaction started is called the ____ energy.
a. chemical
b. activation
c. enzymatic
d. reaction
e. triggering
4 points
QUESTION 3
A series of enzyme-mediated reactions by which cells build, remodel, or break down organic molecules is known as ____.
a. the induced-fit model
b. intermediary compounds
c. energy carriers
d. metabolic pathways
e. activation
4 points
QUESTION 4
The sodium-potassium pump is an example of ____.
a. active transport
b. osmosis
c. facilitated diffusion
d. simple diffusion
e. bulk flow
4 points
QUESTION 5
What happens to a molecule when it is phosphorylated?
a. It gains electrons.
b. It loses electrons and protons.
c. It receives a phosphate group.
d. It loses energy.
e. It becomes denatured.
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