Question 1

A bowl of sugar water is very stable.But if you feed it to cells then it is rapidly broken down into carbon dioxide,water,and ATP.What is the best explanation for this observation?

Accepted Answer

A)  Enzymes in the cell catalyze the breakdown of the glucose.
B)  Cells use energy to break down the glucose.
C)  Glucose becomes more chemically reactive inside of a cell.
D)  Glucose cannot be broken down outside of a cell.
E)  Glucose is removed from the cell by active transport.F) A) and C)
G) C) and E)

Question 2

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) C) and D)
G) D) and E)

Question 3

Exergonic reactions do not require activation energy to get started since they release energy.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A)  chemical bonds and concentration gradients.
B)  light and chemical bonds.
C)  quartz crystals vibrating in a wristwatch.
D)  soil heated by sunlight.
E)  light.F) B) and E)
G) B) and D)

Question 5

The two data curves on the figure illustrate that

Accepted Answer

A)  temperature ranges are not the same for all enzyme activity.
B)  temperature is not related to enzyme efficiency.
C)  optimal temperature ranges are not the same for all enzymes.
D)  pH is not related to enzyme efficiency.
E)  All answers are correct.F) A) and D)
G) D) and E)

Question 6

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) D) and E)
G) A) and E)

Question 7

One way to produce a vaccine is to heat a virus or bacteria and then inject the inactive pathogen as a vaccination.How does the heat inactivate a virus?

Accepted Answer

A)  All answers are correct
B)  by inhibiting its metabolism
C)  by destroying the membrane
D)  by blocking facilitated diffusion
E)  by denaturing proteinsF) C) and D)
G) D) and E)

Question 8

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 coenzymE.F) A) and B)
G) All of the above

Question 9

Enzymes speed chemical reactions by

Accepted Answer

A)  lowering the amount of reactants that are needed.
B)  maintaining temperature.
C)  lowering the energy required to start a chemical reaction.
D)  raising the temperature of the surroundings.
E)  supplying energy to the reaction process.F) C) and D)
G) A) and D)

Question 10

During low 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) A) and D)
G) A) and E) A

Question 11

The vertical drop slightly after the peak of each curve on the figure illustrates

Accepted Answer

A)  that enzymes will not work if temperatures are too hot (or too cold) .
B)  an increased rate of reaction.
C)  a decreased temperature.
D)  that temperatures only affect enzymes up to a specific temperature.
E)  that enzymes are most efficient at cold temperatures.F) All of the above
G) B) and E) A

Question 12

Active transport is different from simple diffusion because active transport

Accepted Answer

A)  requires energy.
B)  moves molecules against a concentration gradient.
C)  requires the use of proteins embedded within the cell membrane.
D)  moves molecules from an area of lower concentration to an area of higher concentration.
E)  All answers are correct.F) B) and C)
G) A) and E)

Question 13

Reduction is the gain of electrons.

Accepted Answer

A) True 
 B)False

Question 14

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 diE.F) All of the above
G) C) and E)

Question 15

Energy is harvested from ______ and used ______.

Accepted Answer

A)  food,light,and chemicals;to do endergonic reactions
B)  endergonic reactions;to do cellular processes
C)  active transport;facilitated diffusion
D)  endocytosis;exocytosis
E)  exocytosis;endocytosisF) None of the above
G) A) and E)

Question 16

Which of the following are examples of potential energy?

Accepted Answer

A)  electrons moving through the electron transport chain,proton gradient
B)  electrons in chemical bonds,proton gradient,ATP
C)  protons moving through ATP synthase,ATP
D)  electrons moving through the electron transport chain,and protons moving through ATP synthase
E)  All answers are correct.F) B) and E)
G) A) and B)

Question 17

Salted and pickled foods can last unrefridgerated for many years because

Accepted Answer

A)  the extreme salt or pH concentration denatures the proteins,including enzymes.
B)  the concentration gradient of salt or vinegar causes osmosis into the food.
C)  equilibrium with the environment has occured.
D)  the concentration gradient of salt or vinegar causes osmosis out of the fooD.
E)  the concentration gradient of salt or vinegar causes osmosis out of the food and the extreme salt or pH concentration denatures the proteins,including enzymes.F) B) and E)
G) B) and C) E

Question 18

If you drop a rubber ball and it does not bounce back to the height you dropped it from.This is consistent with

Accepted Answer

A)  conversion of entropy into potential energy.
B)  the first law of thermodynamics.
C)  conversion of kinetic energy into potential energy.
D)  conversion of kinetic energy into entropy.
E)  the second law of thermodynamics.F) A) and B)
G) A) and C)

Question 19

Why does phenylalanine accumulate in patients with phenylketonuria?

Accepted Answer

A)  They lack an enzyme to break down phenylalanine.
B)  They lack an enzyme to produce phenylalanine.
C)  They produce too much phenylalanine.
D)  They lack an inhibitor of an enzyme to break down phenylalanine.
E)  They eat more phenylalanine than most peoplE.F) None of the above
G) A) and E)

Question 20

An endergonic reaction is a reaction that

Accepted Answer

A)  requires an input of energy.
B)  typically builds complex molecules from smaller molecules.
C)  releases energy to its surroundings.
D)  Both releases energy to its surroundings and typically builds complex molecules from smaller molecules are correct.
E)  Both requires an input of energy and typically builds complex molecules from smaller molecules are correct.F) A) and B)
G) All of the above

Exam 4: The Energy of Life

A bowl of sugar water is very stable.But if you feed it to cells then it is rapidly broken down into carbon dioxide,water,and ATP.What is the best explanation for this observation?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Exergonic reactions do not require activation energy to get started since they release energy.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The two data curves on the figure illustrate that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

One way to produce a vaccine is to heat a virus or bacteria and then inject the inactive pathogen as a vaccination.How does the heat inactivate a virus?

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

Enzymes speed chemical reactions by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

The vertical drop slightly after the peak of each curve on the figure illustrates

Correct AnswerverifiedA

Active transport is different from simple diffusion because active transport

Correct AnswerverifiedShow Answer

Reduction is the gain of electrons.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Energy is harvested from ______ and used ______.

Correct AnswerverifiedShow Answer

Which of the following are examples of potential energy?

Correct AnswerverifiedShow Answer

Salted and pickled foods can last unrefridgerated for many years because

Correct AnswerverifiedE

If you drop a rubber ball and it does not bounce back to the height you dropped it from.This is consistent with

Correct AnswerverifiedShow Answer

Why does phenylalanine accumulate in patients with phenylketonuria?

Correct AnswerverifiedShow Answer

An endergonic reaction is a reaction that

Correct AnswerverifiedShow Answer

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A

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A

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Energy is harvested from and used .

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E

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