Question 1

Which is NOT a feature of the fluid-mosaic model of plasma membranes.

Accepted Answer

A)  Integral membrane proteins are embedded in the membrane. 
B)  Phospholipids form a bilayer. 
C)  Cholesterol associates with phospholipid molecules. 
D)  Carbohydrates are linked to lipids and proteins on the interior surface, forming a glycocalyx layer. 
E)  Peripheral membrane proteins associate with polar regions of integral membrane proteins. 
A)  Integral membrane proteins are embedded in the membrane. 
B)  Phospholipids form a bilayer. 
C)  Cholesterol associates with phospholipid molecules. 
D)  Carbohydrates are linked to lipids and proteins on the interior surface, forming a glycocalyx layer. 
E)  Peripheral membrane proteins associate with polar regions of integral membrane proteins.

Question 2

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 3

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

Accepted Answer

A) True 
 B)False

Question 4

Which is NOT a function of the Golgi apparatus?

Accepted Answer

A)  sorting of proteins destined for various locations in the cell 
B)  modifying proteins destined for secretion 
C)  packaging enzymes destined for lysosomes 
D)  addition of carbohydrate groups to proteins 
E)  transcribing a signal sequence onto proteins destined for secretion 
A)  sorting of proteins destined for various locations in the cell 
B)  modifying proteins destined for secretion 
C)  packaging enzymes destined for lysosomes 
D)  addition of carbohydrate groups to proteins 
E)  transcribing a signal sequence onto proteins destined for secretion

Question 5

ATP is

Accepted Answer

A)  a nucleotide. 
B)  a lipid. 
C)  an amino acid. 
D)  a carbohydrate. 
E)  a steroid. 
A)  a nucleotide. 
B)  a lipid. 
C)  an amino acid. 
D)  a carbohydrate. 
E)  a steroid.

Question 6

How does the synthesis of proteins that are destined to be secreted differ from that of proteins with functions inside the cell?

Accepted Answer

A)  Proteins destined to be secreted have a signal sequence. 
B)  Proteins destined to be secreted are synthesized on free ribosomes. 
C)  Proteins destined to be secreted are packaged into secretory vesicles in the granular endoplasmic reticulum. 
D)  Only proteins destined for secretion need transfer RNA to be synthesized. 
E)  Genes for proteins with functions inside the cell are located in the cytoplasm. 
A)  Proteins destined to be secreted have a signal sequence. 
B)  Proteins destined to be secreted are synthesized on free ribosomes. 
C)  Proteins destined to be secreted are packaged into secretory vesicles in the granular endoplasmic reticulum. 
D)  Only proteins destined for secretion need transfer RNA to be synthesized. 
E)  Genes for proteins with functions inside the cell are located in the cytoplasm.

Question 7

Which is NOT true about cofactors involved in enzymatic reactions?

Accepted Answer

A)  They may alter the conformation of the enzyme. 
B)  They may be a metal such as iron. 
C)  They may be a substrate in a catalyzed reaction. 
D)  There must be equal quantities of enzyme and cofactor molecules for a reaction to proceed. 
E)  Only a small number of cofactor molecules may be needed to maintain enzyme activity. 
A)  They may alter the conformation of the enzyme. 
B)  They may be a metal such as iron. 
C)  They may be a substrate in a catalyzed reaction. 
D)  There must be equal quantities of enzyme and cofactor molecules for a reaction to proceed. 
E)  Only a small number of cofactor molecules may be needed to maintain enzyme activity.

Question 8

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

Question 9

Most energy in the body is stored in what form?

Accepted Answer

A)  ATP 
B)  glucose 
C)  fat 
D)  protein 
E)  DNA 
A)  ATP 
B)  glucose 
C)  fat 
D)  protein 
E)  DNA

Question 10

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 11

Ribosomes transcribe DNA into RNA.

Accepted Answer

A) True 
 B)False

Question 12

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 13

How does a chemical catalyst increase the rate of a reaction?

Accepted Answer

A)  by acting as one of the reactant molecules 
B)  by decreasing the energy of activation 
C)  by increasing the energy content of the product molecules 
D)  by increasing the temperature of a solution 
E)  by phosphorylating a reactant 
A)  by acting as one of the reactant molecules 
B)  by decreasing the energy of activation 
C)  by increasing the energy content of the product molecules 
D)  by increasing the temperature of a solution 
E)  by phosphorylating a reactant

Question 14

Which of the following is NOT a product of glycolysis?

Accepted Answer

A)  carbon dioxide 
B)  ATP 
C)  pyruvate 
D)  NADH 
A)  carbon dioxide 
B)  ATP 
C)  pyruvate 
D)  NADH

Question 15

Allosteric inhibition of rate-limiting enzymes is a common means of regulating anabolic pathways.

Accepted Answer

A) True 
 B)False

Question 16

The probability of a reaction occurring is increased

Accepted Answer

A)  by decreasing reactant concentrations. 
B)  by increasing the activation energy. 
C)  by increasing the concentration of any of the products. 
D)  if the reaction uses a great deal of energy. 
E)  if the concentration of one of the reactants increases. 
A)  by decreasing reactant concentrations. 
B)  by increasing the activation energy. 
C)  by increasing the concentration of any of the products. 
D)  if the reaction uses a great deal of energy. 
E)  if the concentration of one of the reactants increases.

Question 17

Neurons have a very prominent nucleolus, which indicates that they are actively performing what function?

Accepted Answer

A)  making ATP 
B)  synthesizing lipids 
C)  manufacturing ribosomes 
D)  breaking down carbohydrates 
E)  dividing by mitosis 
A)  making ATP 
B)  synthesizing lipids 
C)  manufacturing ribosomes 
D)  breaking down carbohydrates 
E)  dividing by mitosis

Question 18

Which is a major function of the plasma membrane?

Accepted Answer

A)  storing calcium ions 
B)  storing organic chemicals for metabolism 
C)  providing genetic information 
D)  generating ATP 
E)  regulating the passage of molecules into and out of the cell 
A)  storing calcium ions 
B)  storing organic chemicals for metabolism 
C)  providing genetic information 
D)  generating ATP 
E)  regulating the passage of molecules into and out of the cell

Question 19

In the absence of oxygen, cells can derive energy to form ATP from the metabolism of fatty acids.

Accepted Answer

A) True 
 B)False

Question 20

The shape of a ligand and the shape of its binding site influence both the specificity and the affinity of binding.

Accepted Answer

A) True 
 B)False

Which is NOT a feature of the fluid-mosaic model of plasma membranes.

Which is NOT true about fatty acid synthesis?

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

Which is NOT a function of the Golgi apparatus?

ATP is

How does the synthesis of proteins that are destined to be secreted differ from that of proteins with functions inside the cell?

Which is NOT true about cofactors involved in enzymatic reactions?

What is a coenzyme?

Most energy in the body is stored in what form?

Enzymes

Ribosomes transcribe DNA into RNA.

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

How does a chemical catalyst increase the rate of a reaction?

Which of the following is NOT a product of glycolysis?

Allosteric inhibition of rate-limiting enzymes is a common means of regulating anabolic pathways.

The probability of a reaction occurring is increased

Neurons have a very prominent nucleolus, which indicates that they are actively performing what function?

Which is a major function of the plasma membrane?

In the absence of oxygen, cells can derive energy to form ATP from the metabolism of fatty acids.

The shape of a ligand and the shape of its binding site influence both the specificity and the affinity of binding.

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body and Its Relation to Physiology

Movement of Molecules Across Cell Membranes

Cell Signaling in Physiology

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control of 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

Which is NOT a feature of the fluid-mosaic model of plasma membranes.

Which is NOT true about fatty acid synthesis?

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

Which is NOT a function of the Golgi apparatus?

ATP is

How does the synthesis of proteins that are destined to be secreted differ from that of proteins with functions inside the cell?

Which is NOT true about cofactors involved in enzymatic reactions?

What is a coenzyme?

Most energy in the body is stored in what form?

Enzymes

Ribosomes transcribe DNA into RNA.

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

How does a chemical catalyst increase the rate of a reaction?

Which of the following is NOT a product of glycolysis?

Allosteric inhibition of rate-limiting enzymes is a common means of regulating anabolic pathways.

The probability of a reaction occurring is increased

Neurons have a very prominent nucleolus, which indicates that they are actively performing what function?

Which is a major function of the plasma membrane?

In the absence of oxygen, cells can derive energy to form ATP from the metabolism of fatty acids.

The shape of a ligand and the shape of its binding site influence both the specificity and the affinity of binding.

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body and Its Relation to Physiology

Movement of Molecules Across Cell Membranes

Cell Signaling in Physiology

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control of 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