Question 1

During high tide a plant or animal would be at risk of ______.

Accepted Answer

A)  Bursting by osmosis of water
B)  Dehydration by facilitated diffusion of salts
C)  Dehydration by osmosis of water
D)  Bursting by active transport of salts
E)  Dehydration by active transport of saltsF) All of the above
G) B) and D)

Question 2

The breakdown of glucose to carbon dioxide and water is:

Accepted Answer

A)  An endergonic reaction in photosynthesis
B)  An endergonic reaction in cellular respiration
C)  An exergonic reaction in photosynthesis
D)  An exergonic reaction in cellular respirationE) C) and D)
F) B) and D)

Question 3

The energy source that powers the process of photosynthesis is:

Accepted Answer

A)  Water
B)  Glucose
C)  Carbon dioxide
D)  Sunlight
E)  OxygenF) B) and E)
G) A) and D)

Question 4

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of:

Accepted Answer

A)  Positive feedback
B)  Denaturation
C)  Equilibrium
D)  Negative feedback
E)  A coenzymeF) A) and D)
G) A) and C)

Question 5

The sodium-potassium pump catalyzes:

Accepted Answer

A)  Osmosis
B)  Facilitated diffusion
C)  Diffusion
D)  Equilibrium
E)  Active transportF) None of the above
G) C) and E)

Question 6

Coupled reactions:

Accepted Answer

A)  Are reactions in which a exergonic reaction drives an endergonic reaction
B)  Are reactions in which a exergonic reaction drives a spontaneous reaction
C)  Are reactions in which a endergonic reaction drives an exergonic reaction
D)  Are reactions in which a endergonic reaction drives a spontaneous reactionE) A) and B)
F) A) and C)

Question 7

When an end product of a reaction pathway is in excess and inhibits the first enzyme of the pathway,this is an example of positive feedback.

Accepted Answer

A) True 
 B)False

Question 8

Phagocytosis is a process that cells only use to obtain nutrients.

Accepted Answer

A) True 
 B)False

Question 9

What is the independent variable in figure 4.24?

Accepted Answer

A)  The number of defective copies of the CFTR gene in humans
B)  The number of defective copies of the CFTR gene in mice
C)  The amount of fluid in the intestines
D)  Whether or not the subjects were exposed to cholera toxin
E)  Whether or not the subjects were exposed to Vibrio cholera bacteria.F) B) and C)
G) D) and E)

Question 10

At high tide a plant or animal cell will be in ____.

Accepted Answer

A)  An isotonic solution
B)  A hypertonic solution
C)  A hypotonic solution
D)  Equilibrium
E)  OsmosisF) A) and C)
G) B) and D)

Question 11

If a cell has a greater concentration of solute than its environment:

Accepted Answer

A)  The cell is hypertonic to the environment
B)  The cell is isotonic to the environment
C)  The cell is hypotonic to the environment
D)  The cell will not experience a net gain or loss of water
E)  The cell will dieF) A) and B)
G) A) and C)

Question 12

An example (examples) of potential energy is (are) :

Accepted Answer

A)  Chemical bonds and concentration gradients
B)  Light and chemical bonds
C)  Concentration gradients
D)  Chemical bonds
E)  LightF) B) and E)
G) B) and D)

Question 13

Pellagra is caused by a deficiency of:

Accepted Answer

A)  Vitamin C
B)  Vitamin B1
C)  Niacin
D)  Minerals
E)  None are correctF) A) and E)
G) A) and C)

Question 14

The molecule (molecules) that fits into the active site of an enzyme and reacts with the enzyme is:

Accepted Answer

A)  Always a protein
B)  An analog
C)  Always a carbohydrate
D)  A substrate
E)  Always broken down by the enzymeF) A) and B)
G) A) and C)

Question 15

Reduction is the loss of electrons.

Accepted Answer

A) True 
 B)False

Question 16

After the active transport of chloride ions out of the cell by CFTR,why does water follow by osmosis?

Accepted Answer

A)  The cell is now in a hypertonic solution
B)  The cell is now in a hypotonic solution
C)  The cell is now in an isotonic solution
D)  The cell needs to regenerate the ATP used in active transport
E)  The cell must pump out water to avoid burstingF) None of the above
G) C) and E)

Question 17

Which of the following are examples of potential energy?

Accepted Answer

A)  Electrons moving through electron transport chain, proton gradient
B)  Electrons in chemical bonds, proton gradient, ATP
C)  Protons moving through ATPase, ATP
D)  Electrons moving through the electron transport chain, and protons moving through ATPase
E)  All are correctF) B) and D)
G) A) and B)

Question 18

Noncompetitive inhibition of enzymes:

Accepted Answer

A)  Occurs when a substance other than the substrate binds at the active site of an enzyme.
B)  Occurs when a substance binds to an enzyme at a site away from the active site
C)  Occurs by denaturation of an enzyme
D)  Occurs by blocking the production of an enzymeE) B) and C)
F) A) and B)

Question 19

During low tide a plant cell will have an advantage over an animal cell because of its ____.

Accepted Answer

A)  Cell wall
B)  Plasma membrane
C)  Chloroplasts
D)  Nucleus
E)  MitochondriaF) A) and B)
G) C) and D)

Question 20

The metabolic rate of individuals is influenced by:

Accepted Answer

A)  Age
B)  Weight
C)  The amount of thyroxin produced by the thyroid
D)  The amount of body fat
E)  All are correctF) A) and E)
G) A) and D)

Exam 4: The Energy of Life

The molecule (molecules) that fits into the active site of an enzyme and reacts with the enzyme is:

Correct AnswerverifiedShow Answer

After the active transport of chloride ions out of the cell by CFTR,why does water follow by osmosis?

Correct AnswerverifiedShow Answer

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of:

Correct AnswerverifiedShow Answer

During high tide a plant or animal would be at risk of ______.

Correct AnswerverifiedShow Answer

Pellagra is caused by a deficiency of:

Correct AnswerverifiedShow Answer

The metabolic rate of individuals is influenced by:

Correct AnswerverifiedShow Answer

During low tide a plant cell will have an advantage over an animal cell because of its ____.

Correct AnswerverifiedShow Answer

If a cell has a greater concentration of solute than its environment:

Correct AnswerverifiedShow Answer

An example (examples) of potential energy is (are) :

Correct AnswerverifiedShow Answer

Noncompetitive inhibition of enzymes:

Correct AnswerverifiedShow Answer

The breakdown of glucose to carbon dioxide and water is:

Correct AnswerverifiedShow Answer

The energy source that powers the process of photosynthesis is:

Correct AnswerverifiedShow Answer

Coupled reactions:

Correct AnswerverifiedShow Answer

Which of the following are examples of potential energy?

Correct AnswerverifiedShow Answer

When an end product of a reaction pathway is in excess and inhibits the first enzyme of the pathway,this is an example of positive feedback.

Correct AnswerverifiedShow Answer

At high tide a plant or animal cell will be in ____.

Correct AnswerverifiedShow Answer

What is the independent variable in figure 4.24?

Correct AnswerverifiedShow Answer

The sodium-potassium pump catalyzes:

Correct AnswerverifiedShow Answer

Phagocytosis is a process that cells only use to obtain nutrients.

Correct AnswerverifiedShow Answer

Reduction is the loss of electrons.

Correct AnswerverifiedShow Answer

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