Question 1

A light microscope can be used to view very large proteins in a cell.

Accepted Answer

A) True 
 B)False

Question 2

Your colleague has discovered a new species and you are viewing one of the cells under the electron microscope.You see a large,oval-shaped structure in the center of the cell,surrounded by a membrane.After this observation,you hypothesize that the cells of this species are prokaryotic cells.

Accepted Answer

A) True 
 B)False

Question 3

Electrons transferred along the electron transport chain can be used to form

Accepted Answer

A) water. 
B) glucose. 
C) ATP. 
D) NADH. 
E) acetyl coenzyme A. 
A) water. 
B) glucose. 
C) ATP. 
D) NADH. 
E) acetyl coenzyme A.

Question 4

Which is NOT true about fatty acid synthesis?

Accepted Answer

A) Takes place in the cytosol of cells 
B) Results in molecules with an even number of carbon atoms only 
C) Requires more energy than is produced by the catabolism of the same fatty acid 
D) Begins with a molecule of acetyl coenzyme A 
E) The enzymes that catalyze it are in the same location as those that mediate fatty acid catabolism 
A) Takes place in the cytosol of cells 
B) Results in molecules with an even number of carbon atoms only 
C) Requires more energy than is produced by the catabolism of the same fatty acid 
D) Begins with a molecule of acetyl coenzyme A 
E) The enzymes that catalyze it are in the same location as those that mediate fatty acid catabolism

Question 5

In a blood cell,water and carbon dioxide can combine in a reversible reaction to form carbonic acid.If the concentration of carbonic acid increases,which direction will the net reaction proceed in?

Accepted Answer

A) The forward direction (toward more carbonic acid accumulation) 
B) The reverse direction (toward more water and carbon dioxide accumulation) 
C) The net rate will be unaffected by an increase in carbonic acid concentration. 
A) The forward direction (toward more carbonic acid accumulation) 
B) The reverse direction (toward more water and carbon dioxide accumulation) 
C) The net rate will be unaffected by an increase in carbonic acid concentration.

Question 6

With regard to reversible chemical reaction rates,which of the following statements is true?

Accepted Answer

A) Decreasing the concentration of the reactants will increase the forward reaction rate. 
B) Increasing the temperature will increase the forward and reverse reaction rate. 
C) Increasing the activation energy will increase the forward reaction rate. 
D) Increasing the concentration of the products will increase the forward reaction rate. 
E) As a reaction progresses,the rate of the forward reaction increases as the concentration of reactants decreases. 
A) Decreasing the concentration of the reactants will increase the forward reaction rate. 
B) Increasing the temperature will increase the forward and reverse reaction rate. 
C) Increasing the activation energy will increase the forward reaction rate. 
D) Increasing the concentration of the products will increase the forward reaction rate. 
E) As a reaction progresses,the rate of the forward reaction increases as the concentration of reactants decreases.

Question 7

The enzyme carbonic anhydrase catalyzes the catabolism of H₂CO₃ to H₂O and CO₂.

Accepted Answer

A) True 
 B)False

Question 8

During anaerobic glycolysis,a net of two molecules of ATP are generated for each molecule of glucose broken down.

Accepted Answer

A) True 
 B)False

Question 9

Proteins are broken down to amino acids by enzymes called transaminases.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following are TRUE of the Krebs cycle?

Accepted Answer

A) Oxygen is required. 
B) Fats can be utilized as an energy source through conversion to acetyl-coA. 
C) Carbohydrates can be utilized as an energy source through conversion to acetyl-coA. 
D) It takes place in the cytosol. 
E) Only muscle cells utilize it as a way to make ATP. 
A) Oxygen is required. 
B) Fats can be utilized as an energy source through conversion to acetyl-coA. 
C) Carbohydrates can be utilized as an energy source through conversion to acetyl-coA. 
D) It takes place in the cytosol. 
E) Only muscle cells utilize it as a way to make ATP.

Question 11

Transcription factors activate or repress the transcription of specific genes by binding to regions of DNA that interact with the promoter region of a gene.

Accepted Answer

A) True 
 B)False

Question 12

ATP is

Accepted Answer

A) formed during the hydrolysis of ADP. 
B) used by cells for the storage of energy. 
C) used to transfer energy within a cell. 
D) a protein. 
E) a molecule with less total energy content than ADP. 
A) formed during the hydrolysis of ADP. 
B) used by cells for the storage of energy. 
C) used to transfer energy within a cell. 
D) a protein. 
E) a molecule with less total energy content than ADP.

Question 13

Desmosomes are structures that permit direct communication between cells by allowing the cells to exchange small molecules in their cytoplasms.

Accepted Answer

A) True 
 B)False

Question 14

Cyanide is a molecule that binds irreversibly to and acts as an allosteric inhibitor for one of the cytochromes in the electron transport chain.Which of the following molecules would you see increased in the cells of a person suffering from cyanide poisoning?

Accepted Answer

A) ATP 
B) Glucose 
C) Pyruvate 
D) NAD⁺ 
E) NADH 
A) ATP 
B) Glucose 
C) Pyruvate 
D) NAD⁺ 
E) NADH

Question 15

Intracellular fluid is defined as the fluid in the cytosol and organelles.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is true concerning the rate-limiting step in a metabolic pathway?

Accepted Answer

A) It is likely to be the slowest reaction in the pathway,and it is always the last step in a metabolic pathway. 
B) It is likely to be the fastest reaction in the pathway,and it is always the last step in a metabolic pathway. 
C) It is always the first step in the pathway,and may be subject to end-product inhibition. 
D) It is likely to be the slowest reaction in the pathway,and it may be subject to end-product inhibition. 
E) It is likely to be the fastest reaction in the pathway,and it may be subject to end-product inhibition. 
A) It is likely to be the slowest reaction in the pathway,and it is always the last step in a metabolic pathway. 
B) It is likely to be the fastest reaction in the pathway,and it is always the last step in a metabolic pathway. 
C) It is always the first step in the pathway,and may be subject to end-product inhibition. 
D) It is likely to be the slowest reaction in the pathway,and it may be subject to end-product inhibition. 
E) It is likely to be the fastest reaction in the pathway,and it may be subject to end-product inhibition.

Question 17

Macrophages are cells that engulf and digest bacteria and cell debris.To perform the digestive function,macrophages tend to have more ________ than other cells.

Accepted Answer

A) peroxisomes 
B) endosomes 
C) lysosomes 
D) ribosomes 
E) mitochondria 
A) peroxisomes 
B) endosomes 
C) lysosomes 
D) ribosomes 
E) mitochondria

Question 18

Enzymes

Accepted Answer

A) are catalysts in chemical reactions. 
B) can be carbohydrate molecules. 
C) are broken down during chemical reactions they catalyze. 
D) have names generally ending in the suffix "-ose." 
E) are polymers of ATP that store large amounts of energy. 
A) are catalysts in chemical reactions. 
B) can be carbohydrate molecules. 
C) are broken down during chemical reactions they catalyze. 
D) have names generally ending in the suffix "-ose." 
E) are polymers of ATP that store large amounts of energy.

Question 19

You are learning about an integral membrane protein.This protein has a region that is exposed to the extracellular fluid,a region that spans the membrane,and another region that is exposed to the intracellular fluid.Which of the following is likely TRUE of this protein?

Accepted Answer

A) It is a polar molecule. 
B) It is a nonpolar molecule. 
C) It is an amphipathic molecule. 
A) It is a polar molecule. 
B) It is a nonpolar molecule. 
C) It is an amphipathic molecule.

Question 20

What is a coenzyme?

Accepted Answer

A) An organic cofactor that directly participates as one of the substrates in an enzymatic reaction 
B) A metal,such as zinc,that participates in enzymatic reactions 
C) A term regarding enzymatic reactions that is synonymous with "cofactor" 
D) Any ligand that binds to a specific site on a protein receptor 
E) An inorganic molecule that catalyzes enzymatic reactions 
A) An organic cofactor that directly participates as one of the substrates in an enzymatic reaction 
B) A metal,such as zinc,that participates in enzymatic reactions 
C) A term regarding enzymatic reactions that is synonymous with "cofactor" 
D) Any ligand that binds to a specific site on a protein receptor 
E) An inorganic molecule that catalyzes enzymatic reactions

A light microscope can be used to view very large proteins in a cell.

Your colleague has discovered a new species and you are viewing one of the cells under the electron microscope.You see a large,oval-shaped structure in the center of the cell,surrounded by a membrane.After this observation,you hypothesize that the cells of this species are prokaryotic cells.

Electrons transferred along the electron transport chain can be used to form

Which is NOT true about fatty acid synthesis?

In a blood cell,water and carbon dioxide can combine in a reversible reaction to form carbonic acid.If the concentration of carbonic acid increases,which direction will the net reaction proceed in?

With regard to reversible chemical reaction rates,which of the following statements is true?

The enzyme carbonic anhydrase catalyzes the catabolism of H₂CO₃ to H₂O and CO₂.

During anaerobic glycolysis,a net of two molecules of ATP are generated for each molecule of glucose broken down.

Proteins are broken down to amino acids by enzymes called transaminases.

Which of the following are TRUE of the Krebs cycle?

Transcription factors activate or repress the transcription of specific genes by binding to regions of DNA that interact with the promoter region of a gene.

ATP is

Desmosomes are structures that permit direct communication between cells by allowing the cells to exchange small molecules in their cytoplasms.

Cyanide is a molecule that binds irreversibly to and acts as an allosteric inhibitor for one of the cytochromes in the electron transport chain.Which of the following molecules would you see increased in the cells of a person suffering from cyanide poisoning?

Intracellular fluid is defined as the fluid in the cytosol and organelles.

Which of the following is true concerning the rate-limiting step in a metabolic pathway?

Macrophages are cells that engulf and digest bacteria and cell debris.To perform the digestive function,macrophages tend to have more ________ than other cells.

Enzymes

You are learning about an integral membrane protein.This protein has a region that is exposed to the extracellular fluid,a region that spans the membrane,and another region that is exposed to the intracellular fluid.Which of the following is likely TRUE of this protein?

What is a coenzyme?

Homeostasis: A Framework for Human Physiology

Chemical Composition of the Body and Its Relation to Physiology

Movement of Solutes and Water Across Cell Membranes

Cell Signalling in Physiology

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control Body Movement

The Endocrine System

Cardiovascular Physiology

Respiratory Physiology

The Kidneys and Regulation of Water and Inorganic Ions

The Digestion and Absorption of Food

Regulation of Organic Metabolism and Energy Balance

Reproduction

The Immune System

Filters

Exam 3: Cellular Structure, Proteins, and Metabolic Pathways

A light microscope can be used to view very large proteins in a cell.

Your colleague has discovered a new species and you are viewing one of the cells under the electron microscope.You see a large,oval-shaped structure in the center of the cell,surrounded by a membrane.After this observation,you hypothesize that the cells of this species are prokaryotic cells.

Electrons transferred along the electron transport chain can be used to form

Which is NOT true about fatty acid synthesis?

In a blood cell,water and carbon dioxide can combine in a reversible reaction to form carbonic acid.If the concentration of carbonic acid increases,which direction will the net reaction proceed in?

With regard to reversible chemical reaction rates,which of the following statements is true?

The enzyme carbonic anhydrase catalyzes the catabolism of H₂CO₃ to H₂O and CO₂.

During anaerobic glycolysis,a net of two molecules of ATP are generated for each molecule of glucose broken down.

Proteins are broken down to amino acids by enzymes called transaminases.

Which of the following are TRUE of the Krebs cycle?

Transcription factors activate or repress the transcription of specific genes by binding to regions of DNA that interact with the promoter region of a gene.

ATP is

Desmosomes are structures that permit direct communication between cells by allowing the cells to exchange small molecules in their cytoplasms.

Cyanide is a molecule that binds irreversibly to and acts as an allosteric inhibitor for one of the cytochromes in the electron transport chain.Which of the following molecules would you see increased in the cells of a person suffering from cyanide poisoning?

Intracellular fluid is defined as the fluid in the cytosol and organelles.

Which of the following is true concerning the rate-limiting step in a metabolic pathway?

Macrophages are cells that engulf and digest bacteria and cell debris.To perform the digestive function,macrophages tend to have more ________ than other cells.

Enzymes

You are learning about an integral membrane protein.This protein has a region that is exposed to the extracellular fluid,a region that spans the membrane,and another region that is exposed to the intracellular fluid.Which of the following is likely TRUE of this protein?

What is a coenzyme?

Homeostasis: A Framework for Human Physiology

Chemical Composition of the Body and Its Relation to Physiology

Movement of Solutes and Water Across Cell Membranes

Cell Signalling in Physiology

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control Body Movement

The Endocrine System

Cardiovascular Physiology

Respiratory Physiology

The Kidneys and Regulation of Water and Inorganic Ions

The Digestion and Absorption of Food

Regulation of Organic Metabolism and Energy Balance

Reproduction

The Immune System

Filters