Question: Question 1
Plasma membranes are selectively
permeable. This means that

A.

glucose cannot e…


Question 1

Plasma membranes are selectively
permeable. This means that

A.

glucose cannot enter the cell.

B.

the plasma membrane allows some substances to enter or leave a
cell more easily than others.

C.

plasma membranes must be very thick.

Question 2

Oxygen molecules O2
crosse a plasma membrane by

A.

passive transport

B.

osmosis

C.

active transport

Question 3

Facilitated diffusion across a
biological membrane requires ________ and moves a substance
________ its concentration gradient.

A.    energy and
channel proteins; against (up)

B.     transport
proteins that  make channels ; down

C.     energy
; down

Question 4

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.    move to the side
with lower water concentration

B.

move to the side with higher water concentration

C.

move to the side with lower solute concentration

Question 5

Kinetic energy differs from
chemical energy in that

A.

chemical energy is a particular form of kinetic energy.

B.

kinetic energy is the energy of a moving object, whereas
chemical energy is the potential energy of molecules.

C.

kinetic energy is stored energy that has the potential to do
work, and chemical energy is the energy of movement.

Question 6

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; endergonic

B.

endergonic; exergonic

C.

spontaneous; exergonic

Question 7

When an enzyme catalyzes a
reaction

A.    it raises the
activation energy of the reaction.

B.     it lowers
the activation energy of the reaction.

C.     it is used
once and discarded.

  

Question 8

Which of the following statements
regarding enzyme function is false?

A.    An enzyme’s
function depends on its three-dimensional shape.

B.     Enzymes are
very specific for their substrates.

C.     Enzymes are
used up when they catalyze a chemical reaction so must be
synthesized for each new chemical reaction

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