BIOL 2160 Chapter : Test 2 Chapter 4
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Which can cross the phospholipid bilayer of a membrane without assistance from transport proteins?
A. | Ions such as Na+. | |
B. | Small hydrophobic molecules such as O2. | |
C. | Small hydrophilic molecules such as glucose. | |
D. | Any small molecule or ion. |
QUESTION 2
Which transport process requires a cell to expend energy?
A. | Moving a solute up its concentration gradient. | |
B. | No transport processes require energy. | |
C. | Moving a solute either up or down its concentration gradient. | |
D. | Moving a solute down its concentration gradient. |
QUESTION 3
Imagine a cell whose membrane is permeable to water, but impermeable to solute X. If solute X is more concentrated outside the cell than inside, which way will water move by osmosis?
A. | Water will not move in either direction, in or out of the cell. | |
B. | Water will move equally in both directions, in and out of the cell. | |
C. | Water will leave the cell. | |
D. | Water will enter the cell. |
QUESTION 4
The cellular structure that encloses the DNA/genes is the
ribosome. | ||
plasma membrane. | ||
nucleus. | ||
mitochondrion. |
QUESTION 5
The part of metabolism that builds larger, more complex molecules or structures from smaller, simpler components is | |
A. | anabolism. | |
B. | catabolism. | |
C. | catalysis. | |
D. | hydrolysis. |
QUESTION 6
In an exergonic reaction
A. | the reactants have more energy than the products, so energy is absorbed. | |
B. | the reactants have more energy than the products, so energy is released. | |
C. | the reactants have less energy than the products, so energy is released. | |
D. | the reactants have less energy than the products, so energy is absorbed. |
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 |