Question 1

Which of the following substrates are required to run cellular respiration?

Accepted Answer

A)  glucose & oxygen
B)  glucose & carbon dioxide
C)  sunlight & oxygen
D)  energy & glucose

Question 2

Which substrate is missing: 6CO2 + ______ + energy = C6H12O6 + 6O2

Accepted Answer

A)  6H2O
B)  4H2O
C)  4O2
D)  glucose

Question 3

All of the biochemical pathways in a cell constitute

Accepted Answer

A)  coupling reactions.
B)  free energy.
C)  endergonic reactions only.
D)  exergonic reactions only.
E)  metabolism.

Question 4

Which best describes the second law of thermodynamics?

Accepted Answer

A)  Energy is not created nor destroyed,but it can change into matter.
B)  Energy is not created nor destroyed,but it can change from one energy form to another.
C)  Energy can be created from matter or used to produce matter.
D)  Some useful energy is lost as heat whenever an energy transfer occurs.
E)  Energy transfers are always 100% efficient in changing energy from one useful form to another.

Question 5

Lactose is milk sugar,and humans produce substantial lactase enzyme to digest it when we are infants.However,we soon lose some or even all of our lactase after childhood.In such cases,undigested lactose passes to the lower intestine where bacteria break it down into lactic acid and CO2,causing painful gas and bloating.This problem could be avoided by

Accepted Answer

A)  avoiding all dairy products containing lactose.
B)  taking lactase enzyme tablets when consuming lactose products.
C)  taking any enzyme tablets when consuming dairy products.
D)  consuming lactose in tablet form.
E)  Both taking lactase enzyme and avoiding all dairy products would be correct.

Question 6

Which of the following statements about high energy electrons and NADH is correct?

Accepted Answer

A)  NAD+ will capture two electrons and one H+ in order to make NADH.
B)  NAD+ will capture one electron and two H+ in order to make NADH.
C)  NAD+ will capture 2 electrons and one H+ in order to make NADPH.
D)  NAD+ does not require electrons or H+ in order to make NADH.

Question 7

If there are twelve different intermediate products produced in the stages of a metabolic pathway within a cell,we can expect that there

Accepted Answer

A)  is one enzyme that carries this process through to the end product.
B)  is one enzyme for degradation and another enzyme for synthesis.
C)  may not be any enzymes involved if this is a natural cell product.
D)  must be twelve different raw materials combined in the cell by one enzyme.
E)  are about twelve enzymes,at least one responsible for each step in the metabolic pathway.

Question 8

During oxidation NAD+ will accept ______ but only _______.

Accepted Answer

A)  2 electrons,1 hydrogen
B)  1 electron,2 hydrogens
C)  2 electrons,2 hydrogens
D)  1 electron,1 hydrogen

Question 9

If an organism runs photosynthesis for its main form of energy,the removal of what substrate would limit it's growth?

Accepted Answer

A)  6H2O
B)  C6H12O6
C)  6O2
D)  6CO-

Question 10

The metabolic pathway at right involves how many possible chemical reactions?

Accepted Answer

A)  five
B)  six
C)  one
D)  three

Question 11

Which form of energy is NOT correctly associated with the related example?

Accepted Answer

A)  kinetic energy: fat molecules
B)  kinetic energy: movement of muscles
C)  chemical energy: glucose
D)  potential energy: water held behind a dam
E)  potential energy: ATP

Question 12

Which of the following is an example of potential energy?

Accepted Answer

A)  a snickers bar
B)  an apple growing on a tree
C)  a glass of milk
D)  all are examples of potential energy

Question 13

Energy coupling of endergonic and exergonic reactions within cells

Accepted Answer

A)  permits biological reactions to proceed at temperatures consistent with life.
B)  uses heat released by one reaction to fuel the other reaction.
C)  utilizes ATP to carry energy between the exergonic and endergonic reactions.
D)  All of the choices are correct.

Question 14

If the reaction graphed at right is coupled with D  →\rightarrow→  E,then D  →\rightarrow→  E is:

Accepted Answer

A)  exergonic
B)  endergonic
C)  spontaneous
D)  none of the above

Question 15

While science is not yet able to describe the phenomenon of "thinking" in physical terms,we can be certain that it is a process involving the metabolism of brain cells.With positron emission tomography (PET scan) it is possible to inject short-lived isotopes and image the regions of the brain that have the most active metabolism during various mental activities.For different mental functions,different regions and amounts of nerve cells become active.However,

Accepted Answer

A)  the cellular energy expended in "thinking" must be less than the chemical bond energy supplied in food to these brain cells.
B)  "thought" cannot be linked to cell processes because energy is not related to matter.
C)  since thoughts can occur over and over,the requirement for a continual input of energy to prevent entropy does not apply to this cell activity.
D)  "thinking" is beyond the scope of science to study.

Exam 6: Metabolism: Energy and Enzymes

Which substrate is missing: 6CO₂ + ______ + energy = C₆H₁₂O₆ + 6O₂

Correct Answer
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Which of the following substrates are required to run cellular respiration?

Correct Answer
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If an organism runs photosynthesis for its main form of energy,the removal of what substrate would limit it's growth?

Correct Answer
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Which best describes the second law of thermodynamics?

Correct Answer
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Correct Answer
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During oxidation NAD⁺ will accept but only _.

Correct Answer
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The metabolic pathway at right involves how many possible chemical reactions?

Correct Answer
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All of the biochemical pathways in a cell constitute

Correct Answer
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Which of the following statements about high energy electrons and NADH is correct?

Correct Answer
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If there are twelve different intermediate products produced in the stages of a metabolic pathway within a cell,we can expect that there

Correct Answer
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If the reaction graphed at right is coupled with D $\rightarrow$ E,then D $\rightarrow$ E is: $If the reaction graphed at right is coupled with D \rightarrow E,then D \rightarrow E is: A) exergonic B) endergonic C) spontaneous D) none of the above$

Correct Answer
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Which form of energy is NOT correctly associated with the related example?

Correct Answer
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Correct Answer
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Which of the following is an example of potential energy?

Correct Answer
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Energy coupling of endergonic and exergonic reactions within cells

Correct Answer
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Exam 6: Metabolism: Energy and Enzymes

Which substrate is missing: 6CO2 + ______ + energy = C6H12O6 + 6O2

Correct AnswerverifiedShow Answer

Which of the following substrates are required to run cellular respiration?

Correct AnswerverifiedShow Answer

If an organism runs photosynthesis for its main form of energy,the removal of what substrate would limit it's growth?

Correct AnswerverifiedShow Answer

Which best describes the second law of thermodynamics?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

During oxidation NAD+ will accept ______ but only _______.

Correct AnswerverifiedShow Answer

The metabolic pathway at right involves how many possible chemical reactions?

Correct AnswerverifiedShow Answer

All of the biochemical pathways in a cell constitute

Correct AnswerverifiedShow Answer

Which of the following statements about high energy electrons and NADH is correct?

Correct AnswerverifiedShow Answer

If there are twelve different intermediate products produced in the stages of a metabolic pathway within a cell,we can expect that there

Correct AnswerverifiedShow Answer

If the reaction graphed at right is coupled with D →\rightarrow→ E,then D →\rightarrow→ E is:

Correct AnswerverifiedShow Answer

Which form of energy is NOT correctly associated with the related example?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is an example of potential energy?

Correct AnswerverifiedShow Answer

Energy coupling of endergonic and exergonic reactions within cells

Correct AnswerverifiedShow Answer

Which substrate is missing: 6CO₂ + ______ + energy = C₆H₁₂O₆ + 6O₂

Correct Answer
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Correct Answer
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During oxidation NAD⁺ will accept but only _.

Correct Answer
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If the reaction graphed at right is coupled with D $\rightarrow$ E,then D $\rightarrow$ E is: $If the reaction graphed at right is coupled with D \rightarrow E,then D \rightarrow E is: A) exergonic B) endergonic C) spontaneous D) none of the above$

Correct Answer
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