Question 1

What are the products of one turn of the Krebs cycle?

Accepted Answer

A) 1 CO2, 2 NADH, 1 FADH2, 1 ATP 
B) 2 CO2, 3 NADH, 1 FADH2, 1 ATP 
C) 2 CO2, 6 NADH, 2 FADH2, 2 ATP 
D) 4 CO2, 6 NADH, 2 FADH2, 2 ATP 
A) 1 CO2, 2 NADH, 1 FADH2, 1 ATP 
B) 2 CO2, 3 NADH, 1 FADH2, 1 ATP 
C) 2 CO2, 6 NADH, 2 FADH2, 2 ATP 
D) 4 CO2, 6 NADH, 2 FADH2, 2 ATP

Question 2

What is the net number of ATP generated directly during glycolysis per molecule of glucose?

Accepted Answer

A) 0 
B) 2 
C) 4 
D) 6 
A) 0 
B) 2 
C) 4 
D) 6

Question 3

Glucose is not our only food source, nor the only one we can utilize in our bodies to generate energy.Other primary sources of energy include other sugars, proteins, and fats.What metabolic intermediate are fats primarily converted into?

Accepted Answer

A) Pyruvate 
B) Acetyl-CoA 
C) Krebs cycle intermediates 
D) Electron transport chain components 
A) Pyruvate 
B) Acetyl-CoA 
C) Krebs cycle intermediates 
D) Electron transport chain components

Question 4

It is thought that the oldest stage of cellular respiration from an evolutionary perspective is

Accepted Answer

A) the krebs cycle. 
B) the electron transport chain. 
C) fermentation. 
D) glycolysis. 
A) the krebs cycle. 
B) the electron transport chain. 
C) fermentation. 
D) glycolysis.

Question 5

How many oxidation reactions occur during the Krebs cycle?rev: 02_07_2014_QC_44516

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
A) 1 
B) 2 
C) 4 
D) 6

Question 6

Organisms that depend on the energy stored in chemical bonds by other organisms for their food energy are called ____________.

Accepted Answer

A) Autotrophs 
B) Heterotrophs 
C) Oligotrophs 
D) Chemotrophs 
A) Autotrophs 
B) Heterotrophs 
C) Oligotrophs 
D) Chemotrophs

Question 7

One way to generate acetyl-CoA is to convert pyruvate into acetyl-CoA by stripping off a CO2 molecule.The removal of CO2 is referred to as what type of reaction?

Accepted Answer

A) Decarboxylation 
B) Glycolytic 
C) Carboxylation 
D) Acetylation 
A) Decarboxylation 
B) Glycolytic 
C) Carboxylation 
D) Acetylation

Question 8

Cardiac muscle cells need to generate significant amounts of ATP to allow for constant contractile activity.As a result, they primarily depend upon beta-oxidation of fatty acids, which has a higher energy yield than the catabolism of glucose.What would be the ATP yield for beta-oxidation of a hypothetical 10-carbon fatty acid?

Accepted Answer

A) 32 ATP 
B) 35 ATP 
C) 50 ATP 
D) 62 ATP 
A) 32 ATP 
B) 35 ATP 
C) 50 ATP 
D) 62 ATP

Question 9

In aerobic respiration, chemiosmotic generation of ATP is driven by:

Accepted Answer

A) Pi transfer through the plasma membrane. 
B) the Na+/K+ pump. 
C) a difference in H+ concentration on the two sides of the inner mitochondrial membrane. 
D) osmosis of macromolecules. 
A) Pi transfer through the plasma membrane. 
B) the Na+/K+ pump. 
C) a difference in H+ concentration on the two sides of the inner mitochondrial membrane. 
D) osmosis of macromolecules.

Question 10

Why are the components of the electron transport chain embedded in the inner mitochondrial membrane rather than floating freely in the cytoplasm of mitochondrial matrix?

Accepted Answer

A) To generate and maintain the proton gradient essential for ATP production. 
B) To separate the ATP from the ADP. 
C) Because electrons cannot float in the matrix. 
D) Because NADH cannot localize to the mitochondrial matrix. 
A) To generate and maintain the proton gradient essential for ATP production. 
B) To separate the ATP from the ADP. 
C) Because electrons cannot float in the matrix. 
D) Because NADH cannot localize to the mitochondrial matrix.

Question 11

What would be the ATP yield for a molecule that is catabolized to form one molecule of pyruvate in a eukaryotic cell?

Accepted Answer

A) 10 ATP 
B) 12.5 ATP 
C) 25 ATP 
D) 30 ATP 
A) 10 ATP 
B) 12.5 ATP 
C) 25 ATP 
D) 30 ATP

Question 12

Why is the energy generated from the catabolism of sugars and other macromolecules ultimately harnessed to generate ATP?

Accepted Answer

A) ATP can be used by cells to drive endergonic reactions 
B) ATP can be used to make RNA, which is an energy storage molecule in the cell 
C) ATP synthesis is an exergonic reaction 
D) ATP is required to generate the proton gradient in the intermembrane space of mitochondria 
A) ATP can be used by cells to drive endergonic reactions 
B) ATP can be used to make RNA, which is an energy storage molecule in the cell 
C) ATP synthesis is an exergonic reaction 
D) ATP is required to generate the proton gradient in the intermembrane space of mitochondria

Question 13

What aspect of cellular respiration occurs in the cytoplasm in eukaryotic cells?

Accepted Answer

A) Glycolysis 
B) Pyruvate oxidation 
C) The Krebs cycle 
D) The electron transport chain 
A) Glycolysis 
B) Pyruvate oxidation 
C) The Krebs cycle 
D) The electron transport chain

Question 14

When oxygen is unavailable during heavy exercise what process do muscle cells use for energy generation?

Accepted Answer

A) Glycolysis coupled with alcohol fermentation 
B) Anaerobic respiration 
C) Aerobic respiration 
D) Glycolysis coupled with lactate fermentation 
A) Glycolysis coupled with alcohol fermentation 
B) Anaerobic respiration 
C) Aerobic respiration 
D) Glycolysis coupled with lactate fermentation

Question 15

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis, the Krebs cycle and electron transport.Your best advice would be to

Accepted Answer

A) follow ATP production. 
B) follow the protons. 
C) follow NAD+ production. 
D) follow the electrons. 
A) follow ATP production. 
B) follow the protons. 
C) follow NAD+ production. 
D) follow the electrons.

Exam 7: How Cells Harvest Energy

What are the products of one turn of the Krebs cycle?

What is the net number of ATP generated directly during glycolysis per molecule of glucose?

Glucose is not our only food source, nor the only one we can utilize in our bodies to generate energy.Other primary sources of energy include other sugars, proteins, and fats.What metabolic intermediate are fats primarily converted into?

It is thought that the oldest stage of cellular respiration from an evolutionary perspective is

How many oxidation reactions occur during the Krebs cycle?rev: 02_07_2014_QC_44516

Organisms that depend on the energy stored in chemical bonds by other organisms for their food energy are called ____________.

One way to generate acetyl-CoA is to convert pyruvate into acetyl-CoA by stripping off a CO2 molecule.The removal of CO2 is referred to as what type of reaction?

In aerobic respiration, chemiosmotic generation of ATP is driven by:

Why are the components of the electron transport chain embedded in the inner mitochondrial membrane rather than floating freely in the cytoplasm of mitochondrial matrix?

What would be the ATP yield for a molecule that is catabolized to form one molecule of pyruvate in a eukaryotic cell?

Why is the energy generated from the catabolism of sugars and other macromolecules ultimately harnessed to generate ATP?

What aspect of cellular respiration occurs in the cytoplasm in eukaryotic cells?

When oxygen is unavailable during heavy exercise what process do muscle cells use for energy generation?

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis, the Krebs cycle and electron transport.Your best advice would be to

The Science of Biology

The Nature of Molecules and the Properties of Water

The Chemical Building Blocks of Life

Cell Structure

Membranes

Energy and Metabolism

Photosynthesis

Cell Communication

How Cells Divide

Sexual Reproduction and Meiosis

Patterns of Inheritance

Chromosomes, Mapping, and the Meiosis-Inheritance Connection

Dna: the Genetic Material

Genes and How They Work

Control of Gene Expression

Biotechnology

Genomics

Cellular Mechanisms of Development

Genes Within Populations

The Evidence for Evolution

The Origin of Species

Systematics, Phylogenies, and Comparative Biology

Genome Evolution

Evolution of Development

The Origin and Diversity of Life

Viruses

Prokaryotes

Protists

Seedless Plants

Seed Plants

Fungi

Animal Diversity and the Evolution of Body Plans

Protostomes

Deuterostomes

Plant Form

Transport in Plants

Plant Nutrition and Soils

Plant Defense Responses

Sensory Systems in Plants

Plant Reproduction

The Animal Body and Principles of Regulation

The Nervous System

Sensory Systems

The Endocrine System

The Musculoskeletal System

The Digestive System

The Respiratory System

The Circulatory System

Osmotic Regulation and the Urinary System

The Immune System

The Reproductive System

Animal Development

Behavioral Biology

Ecology of Individuals and Populations

Community Ecology

Dynamics of Ecosystems

The Biosphere

Conservation Biology

Filters

One way to generate acetyl-CoA is to convert pyruvate into acetyl-CoA by stripping off a CO₂ molecule.The removal of CO₂ is referred to as what type of reaction?