Question 1

A stronger stimulus above threshold produces a greater action potential in a neuron.

Accepted Answer

A) True 
 B)False

Question 2

Match the result, labelled a. or b., with the force and involved ion in question. (Options may be used more than once or not at all.) a.The ion tends to be moved into the cell by this force. b.The ion tends to be moved out of the cell by this force. -electrical gradient for K⁺ at E_K+

Accepted Answer

The answer of Match the result, labelled a. or b.,...

Question 3

Which of the following statements correctly describes tetanus toxin?

Accepted Answer

A) It combines with glycine receptors, thus blocking the action of this inhibitory neurotransmitter. 
B) It destroys dopamine in the region of the brain that is involved in controlling complex movements. 
C)  It prevents the release of gamma-aminobutyric acid from presynaptic inputs terminating on neurons that supply skeletal muscles. 
D)  It promotes presynaptic facilitation.

Question 4

Neuropeptides are mainly neuromodulators.

Accepted Answer

A) True 
 B)False

Question 5

Match the terms, labelled a. through c., to their descriptions. (Options may be used more than once or not at all.)
a.flagella
b.cilia
c.microvilli
-whip-like appendages

Accepted Answer

The answer of Match the terms, labelled a. through c.,...

Question 6

____________________ is a peroxisomal enzyme that breaks down hydrogen peroxide.

Accepted Answer

The answer of ____________________ is a peroxisomal enzyme that breaks...

Question 7

Match the terms, labelled a. through d., to their descriptions. (Options may be used more than once or not at all.)
a.microtubules
b.microfilaments
c.intermediate filaments
d.micro trabecular lattice
-the largest of the cytoskeletal elements

Accepted Answer

The answer of Match the terms, labelled a. through d.,...

Question 8

Match the cellular proteins, labelled a. through e., with their correct characteristic.
a.dynamin
b.tubulin
c.kinesin
d.actin
e.ribophorin
-provides for transport of vesicles

Accepted Answer

The answer of Match the cellular proteins, labelled a. through...

Question 9

Phosphorylation of a carrier can alter the affinity of its binding sites, accompanied by a change in its conformation.

Accepted Answer

A) True 
 B)False

Question 10

Match the result, labelled a. or b., with the force and involved ion in question. (Options may be used more than once or not at all.) a.The ion tends to be moved into the cell by this force. b.The ion tends to be moved out of the cell by this force. -concentration gradient for K⁺ at resting potential

Accepted Answer

The answer of Match the result, labelled a. or b.,...

Question 11

Active transport is a kind of ____________________ transport.

Accepted Answer

The answer of Active transport is a kind of ____________________...

Question 12

Secretory vesicles are about 200 times larger than transport vesicles.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following are common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response?

Accepted Answer

A) opening or closing of specific channels to regulate ionic movement across the plasma membrane 
B) activation of an extracellular second messenger system 
C)  alteration of DNA structure by attaching to the nucleus 
D)  combination with surface receptor

Question 14

Which of these statements is correct for smooth endoplasmic reticulum?

Accepted Answer

A) It is most abundant in cells specialized for protein secretion. 
B) It gives rise to transport vesicles containing newly synthesized molecules wrapped in a layer of smooth ER membrane. 
C)  It consists of stacks of relatively flattened sacs called cisternae. 
D)  It has many ribosomes.

Question 15

Action potentials can be summed.

Accepted Answer

A) True 
 B)False

Question 16

Schwann cells promote axonal growth, while oligodendrocytes inhibit it.

Accepted Answer

A) True 
 B)False

Question 17

The only means by which an extracellular chemical messenger can bring about a desired intracellular response is to activate a second messenger system.

Accepted Answer

A) True 
 B)False

Question 18

Which of these statements correctly describes the result of a neuron being experimentally stimulated at both ends simultaneously?

Accepted Answer

A) The action potentials would pass in the middle and travel to the opposite ends. 
B) The action potentials would meet in the middle and then be propagated back to their starting positions. 
C)  The action potentials would stop as they met in the middle. 
D)  The stronger action potential would override the weaker action potential.

Question 19

Which of the following is responsible for the falling phase of an action potential?

Accepted Answer

A) opening of Na+ gates 
B) Na+-K+ pump restoring the ions to their original locations 
C)  greatly increased permeability to Na+ 
D)  opening of K+ gates and K+ efflux

Question 20

Cytokinesis is the division of the nucleus during mitosis.

Accepted Answer

A) True 
 B)False

Exam 2: Cell Physiology

A stronger stimulus above threshold produces a greater action potential in a neuron.

Match the result, labelled a. or b., with the force and involved ion in question. (Options may be used more than once or not at all.) a.The ion tends to be moved into the cell by this force. b.The ion tends to be moved out of the cell by this force. -electrical gradient for K+ at EK+

Which of the following statements correctly describes tetanus toxin?

Neuropeptides are mainly neuromodulators.

Match the terms, labelled a. through c., to their descriptions. (Options may be used more than once or not at all.) a.flagella b.cilia c.microvilli -whip-like appendages

____________________ is a peroxisomal enzyme that breaks down hydrogen peroxide.

Match the terms, labelled a. through d., to their descriptions. (Options may be used more than once or not at all.) a.microtubules b.microfilaments c.intermediate filaments d.micro trabecular lattice -the largest of the cytoskeletal elements

Match the cellular proteins, labelled a. through e., with their correct characteristic. a.dynamin b.tubulin c.kinesin d.actin e.ribophorin -provides for transport of vesicles

Phosphorylation of a carrier can alter the affinity of its binding sites, accompanied by a change in its conformation.

Active transport is a kind of ____________________ transport.

Secretory vesicles are about 200 times larger than transport vesicles.

Which of the following are common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response?

Which of these statements is correct for smooth endoplasmic reticulum?

Action potentials can be summed.

Schwann cells promote axonal growth, while oligodendrocytes inhibit it.

The only means by which an extracellular chemical messenger can bring about a desired intracellular response is to activate a second messenger system.

Which of these statements correctly describes the result of a neuron being experimentally stimulated at both ends simultaneously?

Which of the following is responsible for the falling phase of an action potential?

Cytokinesis is the division of the nucleus during mitosis.

Match the result, labelled a. or b., with the force and involved ion in question. (Options may be used more than once or not at all.) a.The ion tends to be moved into the cell by this force. b.The ion tends to be moved out of the cell by this force. -electrical gradient for K⁺ at E_K+