Question 1

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",if two carriers of the defective CFTR gene have a child,what is the probability that the child will have cystic fibrosis?

Accepted Answer

A)  75%
B)  50%
C)  100%
D)  0%
E)  25%F) B) and C)
G) A) and B)

Question 2

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",what is the independent variable in the figure?

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 bacteriaF) A) and B)
G) A) and C)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

The chemical formula for glucose is ______.

Accepted Answer

A)  C6H6O6.
B)  C12H6O12
C)  C12H22O11
D)  C6H6O12
E)  C6H12O6F) A) and B)
G) A) and C)

Question 5

When NaCl (table salt) forms,sodium (Na) loses energy by ______ and chlorine (Cl) gains energy by ______.

Accepted Answer

A)  giving up an electron in oxidation;gaining an electron in reduction
B)  going with its concentration gradient;going against its concentration gradient
C)  going against its concentration gradient;going with its concentration gradient
D)  gaining an electron in oxidation;by giving up an electron in reduction
E)  gaining an electron in reduction;giving up an electron in oxidationF) None of the above
G) C) and D)

Question 6

Which of the following is incorrect about turgor pressure?

Accepted Answer

A)  It occurs in an organism with cell walls when placed into a hypertonic environment.
B)  It is necessary to keep plants from wilting.
C)  It is the force of water against the inside of the cell wall.
D)  It is maintained by osmosis.
E)  It occurs in an organism with cell walls when placed into a hypotonic environment.F) A) and C)
G) B) and C)

Question 7

Enzymes speed up reactions by lowering the activation energy of a reaction.This is analogous with

Accepted Answer

A)  reducing the force a ball needs to start rolling down a hill.
B)  increasing the height an apple will fall from a tree.
C)  blocking a flowing river with a dam to stop the flow.
D)  causing a snow storm in the middle of summer when temperatures are hot.
E)  All answers are correct.F) D) and E)
G) B) and C)

Question 8

Cells use energy for which of the following?

Accepted Answer

A)  to do work
B)  to synthesize proteins
C)  to expel waste
D)  to move substances across membranes
E)  All answers are correctF) A) and B)
G) B) and D)

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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 enzymE.F) A) and E)
G) B) and E)

Question 11

Plants require energy from light to perform photosynthesis in which glucose is formed from carbon dioxide and water.This is an example of _____.

Accepted Answer

A)  an exergonic reaction
B)  kinetic energy
C)  an endergonic reaction
D)  potential energy
E)  equilibriumF) All of the above
G) A) and E)

Question 12

Which of the following are examples of kinetic energy?

Accepted Answer

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

Question 13

If the environment surrounding a cell has a lower concentration of solute than the cell

Accepted Answer

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

Question 14

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",the CFTR receptor moves chloride ions out of a cell by active transport.This is an example of

Accepted Answer

A)  a reaction coupled with the production of ATP.
B)  an oxidation reaction.
C)  a reduction reaction.
D)  a reaction requiring the input of energy (ATP) .
E)  equilibrium.F) C) and D)
G) A) and B)

Question 15

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 B)
G) A) and E)

Question 16

Which statement is NOT associated of the first law of thermodynamics?

Accepted Answer

A)  The amount of energy in the universe is constant.
B)  Energy cannot be created or destroyed.
C)  Energy can be converted to other forms of energy.
D)  Any energy transformation loses some energy to its surroundings as heat.
E)  None of the answers are correct.F) C) and D)
G) None of the above

Question 17

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",why does water leave the cell by osmosis after the active transport of chloride ions out of the cell by CFTR?

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

Question 18

Noncompetitive inhibition of enzymes

Accepted Answer

A)  occurs when a substance other than the correct 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 enzyme.
E)  occurs when two enzymes bind together.F) C) and D)
G) B) and D)

Question 19

Entropy is

Accepted Answer

A)  order.
B)  complexity.
C)  disorder.
D)  Both order and disorder are correct.
E)  Both complexity and disorder are correct.F) A) and D)
G) C) and D)

Question 20

The diffusion of water across a selectively permeable membrane is

Accepted Answer

A)  facilitated diffusion.
B)  active transport.
C)  a rare occurrence.
D)  osmosis.
E)  always beneficial to a cell.F) B) and C)
G) A) and E)

Exam 4: The Energy of Life

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

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Which of the following is incorrect about turgor pressure?

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Plants require energy from light to perform photosynthesis in which glucose is formed from carbon dioxide and water.This is an example of _____.

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

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Which statement is NOT associated of the first law of thermodynamics?

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In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",what is the independent variable in the figure?

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Noncompetitive inhibition of enzymes

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

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If the environment surrounding a cell has a lower concentration of solute than the cell

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The chemical formula for glucose is ______.

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Enzymes speed up reactions by lowering the activation energy of a reaction.This is analogous with

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When NaCl (table salt) forms,sodium (Na) loses energy by ______ and chlorine (Cl) gains energy by ______.

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In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",the CFTR receptor moves chloride ions out of a cell by active transport.This is an example of

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Entropy is

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

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The diffusion of water across a selectively permeable membrane is

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Which of the following are examples of kinetic energy?

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Cells use energy for which of the following?

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In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",if two carriers of the defective CFTR gene have a child,what is the probability that the child will have cystic fibrosis?

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In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",why does water leave the cell by osmosis after the active transport of chloride ions out of the cell by CFTR?

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When NaCl (table salt) forms,sodium (Na) loses energy by and chlorine (Cl) gains energy by .

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