Question 1

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

Question 2

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

Accepted Answer

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

Question 3

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. 
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 4

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. 
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.

Question 5

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

Question 6

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

Question 7

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

Question 8

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. 
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 9

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

Question 10

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

Question 11

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

Accepted Answer

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

Question 12

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. 
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 13

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 
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 14

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. 
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 15

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. 
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.

Exam 6: Metabolism: Energy and Enzymes

During oxidation NAD+ will accept ______ but only _______.

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

Energy coupling of endergonic and exergonic reactions within cells

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

All of the biochemical pathways in a cell constitute

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

Which best describes the second law of thermodynamics?

Which of the following is an example of potential energy?

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

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

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

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

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

A View of Life

Basic Chemistry

The Chemistry of Organic Molecules

Cell Structure and Function

Membrane Structure and Function

Photosynthesis

Cellular Respiration

The Cell Cycle and Cellular Reproduction

Meiosis and Sexual Reproduction

Mendelian Patterns of Inheritance

Molecular Biology of the Gene

Regulation of Gene Expression

Biotechnology and Genomics

Darwin and Evolution

How Populations Evolve

Speciation and Macroevolution

Origin and History of Life

Taxonomy,systematics,and Phylogeny

Viruses,bacteria,and Archaea

Protist Evolution and Diversity

Fungi Evolution and Diversity

Plant Evolution and Diversity

Flowering Plants: Structure and Organization

Flowering Plants: Nutrition and Transport

Flowering Plants: Control of Growth Responses

Flowering Plants: Reproduction

Invertebrate Evolution

Vertebrate Evolution

Human Evolution

Animal Organization and Homeostasis

Circulation and Cardiovascular Systems

The Lymphatic and Immune Systems

Digestive Systems and Nutrition

Respiratory Systems

Body Fluid Regulation and Excretory Systems

Neurons and Nervous Systems

Sense Organs

Locomotion and Support Systems

Hormones and Endocrine Systems

Reproductive Systems

Animal Development

Behavioral Ecology

Population Ecology

Community and Ecosystem Ecology

Major Ecosystems of the Biosphere

Conservation of Biodiversity

Filters

During oxidation NAD⁺ will accept but only _.

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

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