Question 1

Answer the questions by matching each word or groups of words with the appropriate definition.
a.reactant
b.product
c.ATP
d.activation energy
e.reaction
f.phosphorylation
-the main energy carrier between reaction sites in cells

Accepted Answer

The answer of Answer the questions by matching each word...

Question 2

Passive molecular diffusion occurs when

Accepted Answer

A)   the energy of ATP is added.
B)   random collisions between molecules occurs.
C)   there are variations in molecular sizes.
D)   enzymes catalyze their movement.
E)   none of these things occur.F) A) and D)
G) All of the above

Question 3

Which of the following statements is CORRECT about energy?

Accepted Answer

A)   Energy is the capacity to do work.
B)   It can be created using nuclear reactors.
C)   It can be created using a windmill.
D)   It can be created using biofuels.
E)   All of these are correct.F) B) and C)
G) C) and D)

Question 4

In order to survive,heterotrophs must

Accepted Answer

A)   harvest the heat energy that is lost in energy conversions.
B)   recycle energy from our metabolic reactions.
C)   constantly take in energy rich foods.
D)   harvest energy from sunlight.
E)   convert low energy molecules into high energy molecules.F) All of the above
G) A) and B)

Question 5

Energy

Accepted Answer

A)   cannot be created.
B)   cannot be destroyed.
C)   cannot be created or destroyed.
D)   can be created, but it cannot be destroyed.
E)   can be created, and it can be destroyed.F) A) and E)
G) C) and D)

Question 6

Which of the following statements is TRUE?

Accepted Answer

A)   The products of a reaction can have less energy than the reactants.
B)   The products of a reaction can have more energy than the reactants.
C)   Reversible reactions tend to approach equilibrium.
D)   Many reactions are reversible.
E)   All of these are true.F) A) and C)
G) B) and D)

Question 7

Movement of substances that requires the expenditure of ATP molecules is

Accepted Answer

A)   facilitated diffusion.
B)   simple diffusion.
C)   active transport.
D)   osmosis.
E)   bulk flow.F) A) and C)
G) A) and E)

Question 8

To engulf a bacterium,a white blood cell would use

Accepted Answer

A)   facilitated diffusion
B)   osmosis
C)   phagocytosis
D)   exocytosis
E)   sodium-potassium pumpsF) A) and C)
G) B) and D)

Question 9

Tonicity refers to

Accepted Answer

A)   the total concentration of solutes in fluids separated by a selectively permeable membrane.
B)   the pressure exerted by the fluids surrounding a cell.
C)   the amount of negative versus positive charges of the molecules and ions in a solution.
D)   how able a cell is to resist changes in solute concentrations without bursting or shrinking.
E)   the ease with which solutes can cross a particular cell membrane.F) A) and E)
G) A) and C)

Question 10

Unlike plants,fungi,and bacteria,animal cells cannot resist volume increases in hypotonic environments.This is because unlike those other organisms,animal cells

Accepted Answer

A)   do not have central vacuoles.
B)   do not have cell walls.
C)   do not have pumps that can actively pump out excess fluid.
D)   are smaller than those other cells and thus cannot handle large increases in volume.
E)   have relatively more solutes.F) All of the above
G) A) and B)

Question 11

The following statements are all true about energy except one.Choose the exception.

Accepted Answer

A)   Energy is captured by heterotrophs.
B)   Energy is not recycled.
C)   Energy is the ability to do work.
D)   Energy has a tendency to disperse.
E)   Energy can be transferred from one form to another.F) C) and E)
G) A) and B)

Question 12

The second law of thermodynamics implies that

Accepted Answer

A)   energy can be transformed into matter, and because of this, we can get something for nothing.
B)   energy can be destroyed during nuclear reactions.
C)   if energy is gained by one region of the universe, another place in the universe must also gain energy in order to maintain the balance of nature.
D)   energy that is available to do work in the universe is decreasing.
E)   energy can be created out of nothing.F) A) and E)
G) A) and B)

Question 13

Match the following correctly.
a.simple diffusion
b.exocytosis
c.osmosis
d.active transport
e.phagocytosis
-This process explains the movement of molecules against their concentration gradient.

Accepted Answer

The answer of Match the following correctly.
a.simple diffusion
b.exocytosis
c.osmosis
d.active transport
e.phagocytosis
-This process...

Question 14

The amount of turgor that is enough to stop osmosis is called

Accepted Answer

A)   the wilting point.
B)   osmotic pressure.
C)   hypotonicity.
D)   expansion pressure.
E)   hypertonicity.F) All of the above
G) C) and D)

Question 15

Which is true about guncotton?

Accepted Answer

A)   it is a highly explosive derivative of cholesterol.
B)   it is used to make gunpowder.
C)   it is less stable than gunpowder
D)   it has a higher activation energy for a reaction with oxygen than gunpowder
E)   more than one of these is correct.F) None of the above
G) A) and B)

Question 16

Enzymes speed up reactions by

Accepted Answer

A)   lowering activation energy.
B)   adding some energy to the system.
C)   increasing activation energy.
D)   lowering activation energy and adding some energy to the system.
E)   doing all of these.F) All of the above
G) D) and E)

Question 17

Which of the following is most toxic?

Accepted Answer

A)   alcohol dehydrogenase
B)   ethanol
C)   acetaldehyde
D)   acetate
E)   carbon dioxideF) A) and B)
G) B) and D)

Question 18

Oxygen,carbon dioxide,as well as other small molecules,cross the plasma membrane through the process(es) of

Accepted Answer

A)   diffusion.
B)   osmosis.
C)   endocytosis and exocytosis.
D)   active transport.
E)   facilitated diffusion.F) None of the above
G) A) and E)

Question 19

The rate of diffusion across a selectively permeable membrane will be slow when which of the following is (are) true?

Accepted Answer

A)   I only
B)   II only
C)   I and III
D)   II and III
E)   I, II, and IIIF) A) and C)
G) A) and B)

Question 20

In passive transport,the movement of a small,nonpolar molecule across a cell membrane depends on

Accepted Answer

A)   adequate amounts of ATP.
B)   a concentration gradient.
C)   adequate ATP and a concentration gradient
D)   the proper transport protein.
E)   gated channels.F) C) and D)
G) A) and D)

Exam 4: Energy and Metabolism

Enzymes speed up reactions by

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Answer the questions by matching each word or groups of words with the appropriate definition. a.reactant b.product c.ATP d.activation energy e.reaction f.phosphorylation -the main energy carrier between reaction sites in cells

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In passive transport,the movement of a small,nonpolar molecule across a cell membrane depends on

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The following statements are all true about energy except one.Choose the exception.

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Movement of substances that requires the expenditure of ATP molecules is

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Oxygen,carbon dioxide,as well as other small molecules,cross the plasma membrane through the process(es) of

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Which of the following is most toxic?

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Passive molecular diffusion occurs when

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The amount of turgor that is enough to stop osmosis is called

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Which of the following statements is CORRECT about energy?

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Which is true about guncotton?

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Energy

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To engulf a bacterium,a white blood cell would use

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Match the following correctly. a.simple diffusion b.exocytosis c.osmosis d.active transport e.phagocytosis -This process explains the movement of molecules against their concentration gradient.

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Unlike plants,fungi,and bacteria,animal cells cannot resist volume increases in hypotonic environments.This is because unlike those other organisms,animal cells

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The rate of diffusion across a selectively permeable membrane will be slow when which of the following is (are) true?

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The second law of thermodynamics implies that

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Which of the following statements is TRUE?

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In order to survive,heterotrophs must

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Tonicity refers to

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