Question 1

What cellular structures are most closely associated with vaults?

Accepted Answer

A) nuclear pores 
B) peroxisomes 
C) lysosomes 
D) mitochondria 
E) gap junctions 
A) nuclear pores 
B) peroxisomes 
C) lysosomes 
D) mitochondria 
E) gap junctions

Question 2

Free ribosomes differ from membrane-bound ribosomes in that free ribosomes specialize in synthesizing proteins for export (secretion)from the cell.

Accepted Answer

A) True 
 B)False

Question 3

In order to increase the overall rate of a metabolic pathway consisting of five reactions catalyzed by five different enzymes,which must occur?

Accepted Answer

A) increasing the reaction rate of all five enzymes 
B) increasing the reaction rate of the fastest enzyme 
C) increasing the reaction rate of the slowest enzyme 
D) increasing the reaction rate of the first enzyme in the pathway 
E) increasing the reaction rate of the last enzyme in the pathway 
A) increasing the reaction rate of all five enzymes 
B) increasing the reaction rate of the fastest enzyme 
C) increasing the reaction rate of the slowest enzyme 
D) increasing the reaction rate of the first enzyme in the pathway 
E) increasing the reaction rate of the last enzyme in the pathway

Question 4

Peripheral membrane proteins are involved in regulating cell shape and motility.

Accepted Answer

A) True 
 B)False

Question 5

Most of the energy stored in the body is in the form of glycogen.

Accepted Answer

A) True 
 B)False

Question 6

Living cells cannot be viewed under an electron microscope.

Accepted Answer

A) True 
 B)False

Question 7

Which organelles would you expect to be especially numerous in cells that utilize oxygen to generate a great deal of energy in the form of ATP?

Accepted Answer

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

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

The major waste product of metabolism is H2O.

Accepted Answer

A) True 
 B)False

Question 10

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 11

When a reversible chemical reaction is at equilibrium

Accepted Answer

A)  the rate of the reaction in one direction is equal to the rate in the reverse direction. 
B)  the concentration of the reactants is equal to the concentration of the products. 
C)  both the forward and reverse reactions stop occurring. 
D)  the supply of reactants has become exhausted,so the forward reaction ceases and the rate of the reverse reaction increases. 
E)  catalysts no longer influence either the forward or reverse reaction rates. 
A)  the rate of the reaction in one direction is equal to the rate in the reverse direction. 
B)  the concentration of the reactants is equal to the concentration of the products. 
C)  both the forward and reverse reactions stop occurring. 
D)  the supply of reactants has become exhausted,so the forward reaction ceases and the rate of the reverse reaction increases. 
E)  catalysts no longer influence either the forward or reverse reaction rates.

Question 12

The reactions of the Krebs cycle:

Accepted Answer

A) take place in the cytosol of human cells. 
B) generate ATP directly by substrate-level phosphorylation. 
C) are important for the metabolism of carbohydrates but not other molecules. 
D) take place only when no oxygen is present. 
E) produce pyruvate and lactate as end products. 
A) take place in the cytosol of human cells. 
B) generate ATP directly by substrate-level phosphorylation. 
C) are important for the metabolism of carbohydrates but not other molecules. 
D) take place only when no oxygen is present. 
E) produce pyruvate and lactate as end products.

Question 13

Proteins that mediate or catalyze,reactions in which the covalent bonding of the reactant molecules changes are called substrates.

Accepted Answer

A) True 
 B)False

Question 14

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 15

In the Krebs cycle,an acetyl fragment is broken down to CO2 and H ions.

Accepted Answer

A) True 
 B)False

Question 16

What is the term for the segments of primary RNA that are cleaved and discarded by spliceosomes?

Accepted Answer

A) codons 
B) introns 
C) exons 
D) anticodons 
E) genes 
A) codons 
B) introns 
C) exons 
D) anticodons 
E) genes

Question 17

What are desmosomes?

Accepted Answer

A) low-resistance channel-like passages that let ions travel between the interiors of adjacent cells 
B) cell organelles that contain enzymes for digesting cellular debris and foreign microbes 
C) cellular organelles that transcribe RNA into DNA 
D) membrane-bound vesicles that pinch off from the plasma membrane and enter the cell 
E) dense plaques of proteins that maintain firm attachments between adjacent cells 
A) low-resistance channel-like passages that let ions travel between the interiors of adjacent cells 
B) cell organelles that contain enzymes for digesting cellular debris and foreign microbes 
C) cellular organelles that transcribe RNA into DNA 
D) membrane-bound vesicles that pinch off from the plasma membrane and enter the cell 
E) dense plaques of proteins that maintain firm attachments between adjacent cells

Question 18

In a metabolic pathway,the same enzyme ordinarily catalyzes several different reactions.

Accepted Answer

A) True 
 B)False

Question 19

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 20

What is the main function of cellular tight junctions?

Accepted Answer

A) They resist forces that tend to pull cells apart. 
B) They form barriers that restrict the passage of materials through the extracellular space between cells. 
C) They are protein channels that allow the movement of ions between the cytosol of adjacent cells. 
D) They are spaces that allow movement of substances between the interior of the nucleus and the cytosol. 
E) They hold the genetic material in a tightly coiled conformation. 
A) They resist forces that tend to pull cells apart. 
B) They form barriers that restrict the passage of materials through the extracellular space between cells. 
C) They are protein channels that allow the movement of ions between the cytosol of adjacent cells. 
D) They are spaces that allow movement of substances between the interior of the nucleus and the cytosol. 
E) They hold the genetic material in a tightly coiled conformation.

What cellular structures are most closely associated with vaults?

Free ribosomes differ from membrane-bound ribosomes in that free ribosomes specialize in synthesizing proteins for export (secretion)from the cell.

In order to increase the overall rate of a metabolic pathway consisting of five reactions catalyzed by five different enzymes,which must occur?

Peripheral membrane proteins are involved in regulating cell shape and motility.

Most of the energy stored in the body is in the form of glycogen.

Living cells cannot be viewed under an electron microscope.

Which organelles would you expect to be especially numerous in cells that utilize oxygen to generate a great deal of energy in the form of ATP?

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

The major waste product of metabolism is H₂O.

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

When a reversible chemical reaction is at equilibrium

The reactions of the Krebs cycle:

Proteins that mediate or catalyze,reactions in which the covalent bonding of the reactant molecules changes are called substrates.

ATP is

In the Krebs cycle,an acetyl fragment is broken down to CO₂ and H ions.

What is the term for the segments of primary RNA that are cleaved and discarded by spliceosomes?

What are desmosomes?

In a metabolic pathway,the same enzyme ordinarily catalyzes several different reactions.

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

What is the main function of cellular tight junctions?

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

What cellular structures are most closely associated with vaults?

Free ribosomes differ from membrane-bound ribosomes in that free ribosomes specialize in synthesizing proteins for export (secretion)from the cell.

In order to increase the overall rate of a metabolic pathway consisting of five reactions catalyzed by five different enzymes,which must occur?

Peripheral membrane proteins are involved in regulating cell shape and motility.

Most of the energy stored in the body is in the form of glycogen.

Living cells cannot be viewed under an electron microscope.

Which organelles would you expect to be especially numerous in cells that utilize oxygen to generate a great deal of energy in the form of ATP?

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

The major waste product of metabolism is H2O.

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

When a reversible chemical reaction is at equilibrium

The reactions of the Krebs cycle:

Proteins that mediate or catalyze,reactions in which the covalent bonding of the reactant molecules changes are called substrates.

ATP is

In the Krebs cycle,an acetyl fragment is broken down to CO2 and H ions.

What is the term for the segments of primary RNA that are cleaved and discarded by spliceosomes?

What are desmosomes?

In a metabolic pathway,the same enzyme ordinarily catalyzes several different reactions.

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

What is the main function of cellular tight junctions?

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

The major waste product of metabolism is H₂O.

In the Krebs cycle,an acetyl fragment is broken down to CO₂ and H ions.