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Advanced Biology
Test Description: Chapter 5 Test Review
Instructions: Answer all questions to get your test result.
1) The fluid mosaic model describes the plasma membrane as consisting of
A
carbohydrates and phospholipids that can drift in the membrane.
B
two layers of phospholipids with cholesterol sandwiched between them.
C
diverse proteins embedded in a phospholipid bilayer.
D
a phospholipid bilayer with embedded carbohydrates.
2) The cholesterol associated with animal cell membranes
A
is attached to membrane proteins and extends into the watery environment surrounding the cell.
B
helps to stabilize the cell membrane at body temperature.
C
helps solidify the membranes when the room temperature is below freezing.
D
is an abnormality resulting from a diet high in cholesterol.
3) Which of the following statements regarding membrane protein function is false?
A
Membrane proteins transfer genetic information to the cytoplasm.
B
Membrane proteins form junctions between cells.
C
Membrane proteins act as receptors to molecules like hormones.
D
Membrane proteins serve as enzymes.
4) Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell is called
A
selective permeability.
B
inhibition.
C
signal transduction.
D
competition.
5) Small, nonpolar, hydrophobic molecules such as fatty acids
A
very slowly diffuse through a membrane's lipid bilayer.
B
are actively transported across cell membranes.
C
require transport proteins to pass through a membrane's lipid bilayer.
D
easily pass through a membrane's lipid bilayer.
6) When two aqueous solutions that differ in solute concentration are placed on either side of a semipermeable membrane and osmosis is allowed to take place, the water will
A
exhibit an equal movement in both directions across the membrane.
B
exhibit a net movement to the side with lower solute concentration.
C
exhibit a net movement to the side with lower free water concentration.
D
exhibit a net movement to the side with higher free water concentration.
7) Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
A
energy and transport proteins . . . down
B
transport proteins . . . against
C
energy and transport proteins . . . against
D
transport proteins . . . down
8) What is the basic difference between exergonic and endergonic reactions?
A
In exergonic reactions, the reactants have less chemical energy than the products; in endergonic reactions, the opposite is t
B
Exergonic reactions involve the breaking of bonds; endergonic reactions involve the formation of bonds.
C
Exergonic reactions involve ionic bonds; endergonic reactions involve covalent bonds.
D
Exergonic reactions release energy; endergonic reactions absorb it.
9) The process of a white blood cell engulfing a bacterium is
A
osmosis.
B
receptor-mediated endocytosis.
C
pinocytosis.
D
phagocytosis.
10) When a cell uses chemical energy to perform work, it uses the energy released from a(n) ________ reaction to drive a(n) ________ reaction.
A
exergonic . . . spontaneous
B
spontaneous . . . exergonic
C
exergonic . . . endergonic
D
endergonic . . . exergonic
*select an answer for all questions
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