What form(s) can potential energy take in a cell? How can the cell store potential energyso that it can be used to do work?
ï· What form(s) can kinetic energy take in a cell? How can the cell harness kinetic energyand use it to do work?
What form(s) can potential energy take in a cell? How can the cell store potential energyso that it can be used to do work?
ï· What form(s) can kinetic energy take in a cell? How can the cell harness kinetic energyand use it to do work?
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40. When a protein is synthesized within the cell, this process represents a chemical reaction that is:
explosive | ||
exergonic and anabolic | ||
exergonic and catabolic | ||
endergonic and anabolic | ||
endergonic and catabolic |
39. Chemical bonds in carbohydrates (i.e., glucose) and fats, have:
no potential or kinetic energy | ||
large amount of kinetic energy | ||
large amount of potential energy | ||
small amount of potential energy | ||
small amount of kinetic energy |
38. When Na+ moves into the cell following the openning of Na+ channels, _____________________________.
the ion charge across the membrane in the area that Na+ moves in will change. | ||
voltage-gated channels will close. | ||
an action potential will be observed. | ||
the cell will hyperpolarize. | ||
same amount of K+ ions will move out of the cell to counteract the Na+ moving into the cell. |
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 |