Question 1

Allosteric modulation of a protein involves noncovalent binding of a ligand to a regulatory binding site.

Accepted Answer

A) True 
 B)False

Question 2

The promoter sequence of nucleotides in a gene is present on both strands of the DNA molecule,allowing transcription of both strands.

Accepted Answer

A) True 
 B)False

Question 3

Coenzymes are organic cofactors.

Accepted Answer

A) True 
 B)False

Question 4

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 5

In general,the larger the number of different ligands that can bind to a particular binding site on a protein,the less the specificity of that binding site.

Accepted Answer

A) True 
 B)False

Question 6

What is a codon?

Accepted Answer

A) a triplet of deoxyribonucleotides 
B) a triplet of ribonucleotides 
C) a sequence of ribonucleotides on tRNA 
D) a very small gene 
E) a very small genome 
A) a triplet of deoxyribonucleotides 
B) a triplet of ribonucleotides 
C) a sequence of ribonucleotides on tRNA 
D) a very small gene 
E) a very small genome

Question 7

Which is NOT true about protein kinases?

Accepted Answer

A) They add phosphate groups to proteins. 
B) They produce effects similar to allosteric modulation. 
C) They perform the opposite function as phosphatases. 
D) They use ATP to carry out their reactions. 
E) They remove phosphate groups from proteins. 
A) They add phosphate groups to proteins. 
B) They produce effects similar to allosteric modulation. 
C) They perform the opposite function as phosphatases. 
D) They use ATP to carry out their reactions. 
E) They remove phosphate groups from proteins.

Question 8

A certain protein receptor is capable of binding the neurotransmitter epinephrine but does not bind to the neurotransmitters dopamine,glutamate,or serotonin.This is because the receptor displays what characteristic?

Accepted Answer

A) saturation 
B) inhibition 
C) specificity 
D) acclimatization 
E) accommodation 
A) saturation 
B) inhibition 
C) specificity 
D) acclimatization 
E) accommodation

Question 9

What is the defining characteristic of an allosteric protein?

Accepted Answer

A) They contain two polypeptide chains,with each being an exact mirror image of the other. 
B) They contain only one ligand-binding site,but because the specificity is low,many different ligands can bind to it. 
C) They contain two ligand-binding sites,one that activates the protein when a ligand binds,and the other that inactivates the protein when the same ligand binds. 
D) They contain more than one ligand-binding site,and noncovalent binding of a ligand to one site alters the shape of other ligand binding sites. 
E) They contain no binding sites of their own,but act by modulating the activity of other proteins. 
A) They contain two polypeptide chains,with each being an exact mirror image of the other. 
B) They contain only one ligand-binding site,but because the specificity is low,many different ligands can bind to it. 
C) They contain two ligand-binding sites,one that activates the protein when a ligand binds,and the other that inactivates the protein when the same ligand binds. 
D) They contain more than one ligand-binding site,and noncovalent binding of a ligand to one site alters the shape of other ligand binding sites. 
E) They contain no binding sites of their own,but act by modulating the activity of other proteins.

Question 10

The first step in glycogen synthesis is the phosphorylation of glucose.

Accepted Answer

A) True 
 B)False

Question 11

Proteins destined to become integral membrane proteins have a signal sequence.

Accepted Answer

A) True 
 B)False

Question 12

Which best describes functions of the agranular (smooth)endoplasmic reticulum?

Accepted Answer

A) transcription of DNA into RNA 
B) generation of ATP 
C) digestion of engulfed bacteria and cellular debris 
D) synthesis and packaging of proteins for secretion from the cell or export to other organelles 
E) synthesis of lipids and intracellular storage of calcium ions 
A) transcription of DNA into RNA 
B) generation of ATP 
C) digestion of engulfed bacteria and cellular debris 
D) synthesis and packaging of proteins for secretion from the cell or export to other organelles 
E) synthesis of lipids and intracellular storage of calcium ions

Question 13

The only role of modulator molecules is to enhance the binding affinity of the functional site of an allosteric protein.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following metabolic pathways can proceed in the absence of oxygen?

Accepted Answer

A) glycolysis 
B) oxidative phosphorylation 
C)  Krebs cycle 
D) the breakdown of fatty acids to CO2 and H2O 
E)  None of the choices are correct. 
A) glycolysis 
B) oxidative phosphorylation 
C)  Krebs cycle 
D) the breakdown of fatty acids to CO2 and H2O 
E)  None of the choices are correct.

Question 15

The organelles that digest engulfed bacteria and cell debris are the:

Accepted Answer

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

Question 16

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 17

A solution containing proteins of a particular type is exposed to the same concentrations of ligands X and Y,but the percent saturation of molecule X is greater than the percent saturation of molecule Y.Which is most likely to be a true statement?

Accepted Answer

A) The binding sites for ligand X are 100% saturated. 
B) The binding sites for ligand X have greater specificity than the binding site for ligand Y. 
C) Ligand X must be a competitive inhibitor of ligand Y. 
D) Both ligands must bind to the same binding site on the protein. 
E) The protein has a higher affinity for ligand X than for ligand Y. 
A) The binding sites for ligand X are 100% saturated. 
B) The binding sites for ligand X have greater specificity than the binding site for ligand Y. 
C) Ligand X must be a competitive inhibitor of ligand Y. 
D) Both ligands must bind to the same binding site on the protein. 
E) The protein has a higher affinity for ligand X than for ligand Y.

Question 18

In which organelle are carbohydrate chains added to glycoproteins?

Accepted Answer

A) golgi apparatus 
B) smooth endoplasmic reticulum 
C) nucleus 
D) lysosome 
E) mitochondrion 
A) golgi apparatus 
B) smooth endoplasmic reticulum 
C) nucleus 
D) lysosome 
E) mitochondrion

Question 19

Lysosomes are organelles specialized for breaking down intracellular debris or malfunctioning parts of cells.

Accepted Answer

A) True 
 B)False

Question 20

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

Allosteric modulation of a protein involves noncovalent binding of a ligand to a regulatory binding site.

The promoter sequence of nucleotides in a gene is present on both strands of the DNA molecule,allowing transcription of both strands.

Coenzymes are organic cofactors.

What is a coenzyme?

In general,the larger the number of different ligands that can bind to a particular binding site on a protein,the less the specificity of that binding site.

What is a codon?

Which is NOT true about protein kinases?

A certain protein receptor is capable of binding the neurotransmitter epinephrine but does not bind to the neurotransmitters dopamine,glutamate,or serotonin.This is because the receptor displays what characteristic?

What is the defining characteristic of an allosteric protein?

The first step in glycogen synthesis is the phosphorylation of glucose.

Proteins destined to become integral membrane proteins have a signal sequence.

Which best describes functions of the agranular (smooth)endoplasmic reticulum?

The only role of modulator molecules is to enhance the binding affinity of the functional site of an allosteric protein.

Which of the following metabolic pathways can proceed in the absence of oxygen?

The organelles that digest engulfed bacteria and cell debris are the:

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

A solution containing proteins of a particular type is exposed to the same concentrations of ligands X and Y,but the percent saturation of molecule X is greater than the percent saturation of molecule Y.Which is most likely to be a true statement?

In which organelle are carbohydrate chains added to glycoproteins?

Lysosomes are organelles specialized for breaking down intracellular debris or malfunctioning parts of cells.

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

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body

Movement of Molecules Across Cell Membranes

Control of Cells by Chemical Messengers

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

Defense Mechanisms of the Body

Medical Physiology: Integration Using Clinical Cases

Filters

Exam 3: Cellular Structure, Proteins, and Metabolism

Allosteric modulation of a protein involves noncovalent binding of a ligand to a regulatory binding site.

The promoter sequence of nucleotides in a gene is present on both strands of the DNA molecule,allowing transcription of both strands.

Coenzymes are organic cofactors.

What is a coenzyme?

In general,the larger the number of different ligands that can bind to a particular binding site on a protein,the less the specificity of that binding site.

What is a codon?

Which is NOT true about protein kinases?

A certain protein receptor is capable of binding the neurotransmitter epinephrine but does not bind to the neurotransmitters dopamine,glutamate,or serotonin.This is because the receptor displays what characteristic?

What is the defining characteristic of an allosteric protein?

The first step in glycogen synthesis is the phosphorylation of glucose.

Proteins destined to become integral membrane proteins have a signal sequence.

Which best describes functions of the agranular (smooth)endoplasmic reticulum?

The only role of modulator molecules is to enhance the binding affinity of the functional site of an allosteric protein.

Which of the following metabolic pathways can proceed in the absence of oxygen?

The organelles that digest engulfed bacteria and cell debris are the:

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

A solution containing proteins of a particular type is exposed to the same concentrations of ligands X and Y,but the percent saturation of molecule X is greater than the percent saturation of molecule Y.Which is most likely to be a true statement?

In which organelle are carbohydrate chains added to glycoproteins?

Lysosomes are organelles specialized for breaking down intracellular debris or malfunctioning parts of cells.

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

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body

Movement of Molecules Across Cell Membranes

Control of Cells by Chemical Messengers

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

Defense Mechanisms of the Body

Medical Physiology: Integration Using Clinical Cases

Filters