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Cell Test Review
Test Description: Chapter 6 Advanced Biology Review
Instructions: Answer all questions to get your test result.
1) Osmosis can be defined as
A
the diffusion of nonpolar molecules.
B
passive transport.
C
the diffusion of water.
D
active transport.
2) Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell is called
A
competition.
B
selective permeability.
C
signal transduction.
D
inhibition.
3) Small, nonpolar, hydrophobic molecules such as fatty acids
A
require transport proteins to pass through a membrane's lipid bilayer.
B
very slowly diffuse through a membrane's lipid bilayer.
C
are actively transported across cell membranes.
D
easily pass through a membrane's lipid bilayer.
4) The cholesterol associated with animal cell membranes
A
helps to stabilize the cell membrane at body temperature.
B
helps solidify the membranes when the room temperature is below freezing.
C
is an abnormality resulting from a diet high in cholesterol.
D
is attached to membrane proteins and extends into the watery environment surrounding the cell.
5) Membrane phospholipids
A
have hydrophobic heads that face the center of the membrane and are shielded from water.
B
are able to drift about in the plasma membrane
C
have hydrophilic tails that face outward and are exposed to water.
D
remain fluid because they are tightly packed against one another.
6) Which of the following statements regarding enzymes is true?
A
All enzymes depend on protein cofactors to function.
B
Enzymes are inorganic.
C
Enzymes catalyze specific reactions.
D
An enzyme's function is unaffected by changes in pH.
7) In a hypotonic solution, an animal cell will
A
experience turgor.
B
neither gain nor lose water.
C
lyse.
D
shrivel.
8) A plant cell in a hypotonic solution
A
becomes turgid because of an inflow of water.
B
bursts because of an inflow of water.
C
shrivels because of an outflow of water.
D
wilts because of an outflow of water.
9) Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
A
transport proteins . . . down
B
transport proteins . . . against
C
energy and transport proteins . . . down
D
energy and transport proteins . . . against
10) The transfer of a phosphate group to a molecule or compound is called
A
carboxylation.
B
hydrogenation.
C
ionization.
D
phosphorylation.
11) The active site of an enzyme is
A
the highly changeable portion of an enzyme that adapts to fit the substrates of various reactions.
B
the region of an enzyme that attaches to a substrate.
C
the region of a product that detaches from the enzyme.
D
the region of a substrate that is changed by an enzyme.
12) Aquaporins
A
allow for the active transport of water.
B
allow water to cross the plasma membrane via facilitated diffusion.
C
are found in all cells.
D
allow water to cross the plasma membrane against its concentration gradient.
13) The process of a white blood cell engulfing a bacterium is
A
receptor-mediated endocytosis.
B
osmosis.
C
phagocytosis.
D
pinocytosis.
14) Which of the following examples is classified as a metabolic pathway?
A
osmosis
B
passive diffusion
C
protein synthesis
D
cell lysis
15) What is the basic difference between exergonic and endergonic reactions?
A
Exergonic reactions involve the breaking of bonds; endergonic reactions involve the formation of bonds.
B
Exergonic reactions release energy; endergonic reactions absorb it.
C
In exergonic reactions the reactants have less chemical energy than the products in endergonic reactions the opposite is true
D
Exergonic reactions involve ionic bonds; endergonic reactions involve covalent bonds.
*select an answer for all questions
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