Question 1

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 2

During oxidative phosphorylation, hydrogen atoms are passed serially from a coenzyme down a chain of molecules called cytochromes.

Accepted Answer

A) True 
 B)False

Question 3

What codon corresponds to the DNA sequence G-T-A?

Accepted Answer

A)  G-T-A 
B)  A-T-G 
C)  C-A-T 
D)  C-A-U 
E)  T-A-C 
A)  G-T-A 
B)  A-T-G 
C)  C-A-T 
D)  C-A-U 
E)  T-A-C

Question 4

A ribosome is composed of one molecule of RNA and several proteins.

Accepted Answer

A) True 
 B)False

Question 5

Chromosomes are composed mainly of DNA.

Accepted Answer

A) True 
 B)False

Question 6

Coenzymes are organic cofactors.

Accepted Answer

A) True 
 B)False

Question 7

Living cells cannot be viewed under an electron microscope.

Accepted Answer

A) True 
 B)False

Question 8

Which would be true about the following reaction? M + N   Y + Z

Accepted Answer

A)  Adding a catalyst would alter the final concentrations of products and reactants at equilibrium. 
B)  Starting at chemical equilibrium, increasing the concentration of M will transiently increase the rate of formation of Y and Z. 
C)  Starting at chemical equilibrium, decreasing the concentration of M will increase the concentration of Y and Z. 
D)  Both the reaction is reversible and at chemical equilibrium and increasing the concentration of M will drive the reaction to the left are correct. 
E)  Because the reactants and products are different molecules, this is not a reversible reaction. 
A)  Adding a catalyst would alter the final concentrations of products and reactants at equilibrium. 
B)  Starting at chemical equilibrium, increasing the concentration of M will transiently increase the rate of formation of Y and Z. 
C)  Starting at chemical equilibrium, decreasing the concentration of M will increase the concentration of Y and Z. 
D)  Both the reaction is reversible and at chemical equilibrium and increasing the concentration of M will drive the reaction to the left are correct. 
E)  Because the reactants and products are different molecules, this is not a reversible reaction.

Question 9

Glucose cannot be synthesized from fatty acids because the reaction converting pyruvic acid to acetyl coenzyme A is not reversible.

Accepted Answer

A) True 
 B)False

Question 10

The consequences of mutations are invariably harmful.

Accepted Answer

A) True 
 B)False

Question 11

At equilibrium, in an irreversible reaction:

Accepted Answer

A)  almost all of the reactants will have been converted to products. 
B)  there will be an equal number of products and reactants. 
C)  there will be very few molecules of product. 
D)  small amounts of energy will have been released. 
E)  large amounts of energy must have been input to reach that state. 
A)  almost all of the reactants will have been converted to products. 
B)  there will be an equal number of products and reactants. 
C)  there will be very few molecules of product. 
D)  small amounts of energy will have been released. 
E)  large amounts of energy must have been input to reach that state.

Question 12

Which describes the action of a ligand's competitive antagonist?

Accepted Answer

A)  It decreases the amount of ligand required to activate the protein. 
B)  It blocks the binding of the ligand to its binding site and prevents activation of the protein. 
C)  It binds to a different binding site on the protein, altering the protein shape so that a ligand cannot bind. 
D)  When present, it increases the binding of a ligand to its receptor. 
A)  It decreases the amount of ligand required to activate the protein. 
B)  It blocks the binding of the ligand to its binding site and prevents activation of the protein. 
C)  It binds to a different binding site on the protein, altering the protein shape so that a ligand cannot bind. 
D)  When present, it increases the binding of a ligand to its receptor.

What are desmosomes?

During oxidative phosphorylation, hydrogen atoms are passed serially from a coenzyme down a chain of molecules called cytochromes.

What codon corresponds to the DNA sequence G-T-A?

A ribosome is composed of one molecule of RNA and several proteins.

Chromosomes are composed mainly of DNA.

Coenzymes are organic cofactors.

Living cells cannot be viewed under an electron microscope.

Which would be true about the following reaction? M + N Y + Z

Glucose cannot be synthesized from fatty acids because the reaction converting pyruvic acid to acetyl coenzyme A is not reversible.

The consequences of mutations are invariably harmful.

At equilibrium, in an irreversible reaction:

Which describes the action of a ligand's competitive antagonist?

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

What are desmosomes?

During oxidative phosphorylation, hydrogen atoms are passed serially from a coenzyme down a chain of molecules called cytochromes.

What codon corresponds to the DNA sequence G-T-A?

A ribosome is composed of one molecule of RNA and several proteins.

Chromosomes are composed mainly of DNA.

Coenzymes are organic cofactors.

Living cells cannot be viewed under an electron microscope.

Which would be true about the following reaction? M + N Y + Z

Glucose cannot be synthesized from fatty acids because the reaction converting pyruvic acid to acetyl coenzyme A is not reversible.

The consequences of mutations are invariably harmful.

At equilibrium, in an irreversible reaction:

Which describes the action of a ligand's competitive antagonist?

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