Question 1

The affinity a binding site has for a ligand

Accepted Answer

A)  Can be influenced by the shape of the binding site
B)  Can be influenced by the presence of charged groups on the ligand and the binding site
C)  Is a measure of how readily a bound ligand can be released from the protein
D)  Both can be influenced by the shape of the binding site and can be influenced by the presence of charged groups on the ligand and the binding site are correct
E)  All of the choices are correctF) C) and D)
G) A) and C)

Question 2

Which of the following does not describe the 50 percent saturation point of a solution of ligands and proteins?

Accepted Answer

A)  It refers to the amount of protein required to bind 50 percent of the ligand
B)  It refers to the amount of ligand required to bind 50 percent of the binding sites
C)  It refers to the amount of ligand required to bind one binding site 50 percent of the time
D)  It can be used to measure the affinity of a binding site for a ligandE) C) and D)
F) None of the above

Question 3

With respect to the genetic language,how many words are there? _______

Accepted Answer

The answer of With respect to the genetic language,how many...

Question 4

The major lipids in cellular membranes are phospholipids.

Accepted Answer

A) True 
 B)False

Question 5

RNA synthesis from a DNA template

Accepted Answer

A)  Is called translation of the message
B)  Requires DNA polymerase
C)  Is regulated
D)  Occurs in the nucleolus
E)  None of the choices are correctF) B) and D)
G) None of the above

Question 6

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

Accepted Answer

A)  Water
B)  Reactive oxygen species
C)  ATP
D)  NADH
E)  Water and reactive oxygen speciesF) A) and B)
G) B) and E)

Question 7

Once protein synthesis is completed,the protein that was synthesized may undergo further changes prior to its secretion or use within the cell.

Accepted Answer

A) True 
 B)False

Question 8

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)  Both used by cells for the storage of energy and used to transfer energy within a cellF) D) and E)
G) C) and D)

Question 9

One striking feature of plasma membrane structure is its symmetry,with the extracellular and cytoplasmic surfaces virtual mirror images of each other.

Accepted Answer

A) True 
 B)False

Question 10

Located primarily on the inner membrane surface is descriptive of

Accepted Answer

A)  Integral membrane proteins
B)  Peripheral membrane proteins
C)  Both kinds of membrane proteinsD) All of the above
E) A) and C)

Question 11

Chromosomes are condensed forms of chromatin.

Accepted Answer

A) True 
 B)False

Question 12

A gene

Accepted Answer

A)  Contains information necessary for the synthesis of proteins
B)  Is a sequence of nucleotides in DNA
C)  Is composed of many molecules of DNA
D)  Contains information necessary for the synthesis of proteins and is a sequence of nucleotides in DNA
E)  All of the choices are correctF) A) and D)
G) B) and D)

Question 13

Modulator molecules

Accepted Answer

A)  Bind to proteins and cause a conformational change that facilitates or inhibits the binding of the functional ligand to its binding site
B)  Enable ligands to bind to their binding sites by phosphorylating the ligand
C)  Prevent ligands from binding to their binding sites by phosphorylating the ligand
D)  Denature proteins containing binding sites for ligands
E)  Do none of the choicesF) C) and E)
G) None of the above

Question 14

Are allosteric proteins describes

Accepted Answer

A)  Protein kinases
B)  Phosphoprotein phosphatases
C)  Both protein kinases and phosphoprotein phosphatases
D)  Neither protein kinases nor phosphoprotein phosphatasesE) All of the above
F) A) and B)

Question 15

A major function of plasma membranes is to

Accepted Answer

A)  Store calcium ions
B)  Store organic chemicals for metabolism
C)  Provide genetic information
D)  Generate ATP
E)  Regulate the passage of molecules into and out of the cellF) D) and E)
G) C) and E)

Question 16

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 17

There are twenty different molecules of tRNA.

Accepted Answer

A) True 
 B)False

Question 18

One function of integral membrane proteins in the plasma membrane of cells is to form channels to allow passage of nonpolar solutes into the cell.

Accepted Answer

A) True 
 B)False

Question 19

Phosphorylation or dephosphorylation of proteins is a common means of

Accepted Answer

A)  Covalent modulation of the proteins
B)  The activation or inactivation of kinases
C)  Allosteric modulation of the proteins
D)  Covalent modulation of the proteins and the activation or inactivation of kinases
E)  All of the choices are correctF) B) and C)
G) C) and D)

Question 20

The greater the ligand concentration needed to achieve 50 percent saturation of a particular binding site,the higher the affinity of the binding site for that ligand.

Accepted Answer

A) True 
 B)False

Exam 3: Cellular Structure, Proteins, and Metabolism

The greater the ligand concentration needed to achieve 50 percent saturation of a particular binding site,the higher the affinity of the binding site for that ligand.

Correct AnswerverifiedShow Answer

Located primarily on the inner membrane surface is descriptive of

Correct AnswerverifiedShow Answer

RNA synthesis from a DNA template

Correct AnswerverifiedShow Answer

The affinity a binding site has for a ligand

Correct AnswerverifiedShow Answer

Chromosomes are condensed forms of chromatin.

Correct AnswerverifiedShow Answer

There are twenty different molecules of tRNA.

Correct AnswerverifiedShow Answer

Once protein synthesis is completed,the protein that was synthesized may undergo further changes prior to its secretion or use within the cell.

Correct AnswerverifiedShow Answer

Are allosteric proteins describes

Correct AnswerverifiedShow Answer

Which of the following does not describe the 50 percent saturation point of a solution of ligands and proteins?

Correct AnswerverifiedShow Answer

A major function of plasma membranes is to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Modulator molecules

Correct AnswerverifiedShow Answer

With respect to the genetic language,how many words are there? _______

Correct AnswerverifiedShow Answer

The major lipids in cellular membranes are phospholipids.

Correct AnswerverifiedShow Answer

ATP is

Correct AnswerverifiedShow Answer

Phosphorylation or dephosphorylation of proteins is a common means of

Correct AnswerverifiedShow Answer

A gene

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

One striking feature of plasma membrane structure is its symmetry,with the extracellular and cytoplasmic surfaces virtual mirror images of each other.

Correct AnswerverifiedShow Answer

One function of integral membrane proteins in the plasma membrane of cells is to form channels to allow passage of nonpolar solutes into the cell.

Correct AnswerverifiedShow Answer

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