Advanced Biology Question Preview (ID: 38682)
Chapter 5 Test Review.
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Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
a) transport proteins . . . down
b) energy and transport proteins . . . against
c) energy and transport proteins . . . down
d) transport proteins . . . against
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 a net movement to the side with lower solute concentration.
b) exhibit an equal movement in both directions across the membrane.
c) exhibit a net movement to the side with higher free water concentration.
d) exhibit a net movement to the side with lower free water concentration.
Small, nonpolar, hydrophobic molecules such as fatty acids
a) very slowly diffuse through a membrane's lipid bilayer.
b) require transport proteins to pass through a membrane's lipid bilayer.
c) easily pass through a membrane's lipid bilayer.
d) are actively transported across cell membranes.
Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell is called
a) selective permeability.
b) signal transduction.
c) competition.
d) inhibition.
Which of the following statements regarding membrane protein function is false?
a) Membrane proteins act as receptors to molecules like hormones.
b) Membrane proteins form junctions between cells.
c) Membrane proteins serve as enzymes.
d) Membrane proteins transfer genetic information to the cytoplasm.
The fluid mosaic model describes the plasma membrane as consisting of
a) diverse proteins embedded in a phospholipid bilayer.
b) two layers of phospholipids with cholesterol sandwiched between them.
c) a phospholipid bilayer with embedded carbohydrates.
d) carbohydrates and phospholipids that can drift in the membrane.
The cholesterol associated with animal cell membranes
a) is an abnormality resulting from a diet high in cholesterol.
b) is attached to membrane proteins and extends into the watery environment surrounding the cell.
c) helps to stabilize the cell membrane at body temperature.
d) helps solidify the membranes when the room temperature is below freezing.
The process of a white blood cell engulfing a bacterium is
a) osmosis.
b) phagocytosis.
c) receptor-mediated endocytosis.
d) pinocytosis.
When a cell uses chemical energy to perform work, it uses the energy released from a(n) ________ reaction to drive a(n) ________ reaction.
a) spontaneous . . . exergonic
b) exergonic . . . endergonic
c) exergonic . . . spontaneous
d) endergonic . . . exergonic
What is the basic difference between exergonic and endergonic reactions?
a) Exergonic reactions release energy; endergonic reactions absorb it.
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) In exergonic reactions, the reactants have less chemical energy than the products; in endergonic reactions, the opposite is t
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