Question 1

The sodium-potassium pump moves ions against their concentration gradients and helps maintain an electrochemical gradient across the plasma membrane.

Accepted Answer

A) True 
 B)False

Question 2

Which statement is accurate?

Accepted Answer

A)   DNA is made up entirely of genes; a chromosome is the unwoven form of chromatin.
B)   A sequence of nucleotides in DNA constitutes a gene; DNA and associated proteins form chromatin.
C)   Human cells contain 46 genes; another name for a gene is a nucleosome.
D)   Each nucleotide in a gene is bound by hydrogen to the next nucleotide in the sequence; chromatin is a nitrogenous base.E) B) and C)
F) A) and D)

Question 3

Osmosis is the diffusion of

Accepted Answer

A)   water within the inside of a cell.
B)   water across a membrane.
C)   solutes within the inside of a cell.
D)   solutes across a membrane.E) A) and B)
F) C) and D)

Question 4

Which does not occur during the G2 phase?

Accepted Answer

A)   Centriole replication is completed.
B)   Organelle production continues.
C)   Enzymes needed for cell division are synthesized.
D)   Each DNA molecule replicates.
E)   No exceptions; all of these occur during the G2 phase.F) B) and E)
G) D) and E)

Question 5

Everything packaged by the Golgi apparatus for secretion leaves the cell within a vesicle.

Accepted Answer

A) True 
 B)False

Question 6

Which are the smallest components of the cytoskeleton?

Accepted Answer

A)   Microtubules
B)   Microfilaments
C)   Intermediate filaments
D)   Centrosomes
E)   CentriolesF) A) and B)
G) B) and E)

Question 7

The term used to describe the fluid within a cell is ________, or intracellular fluid.

Accepted Answer

The answer of The term used to describe the fluid...

Question 8

The microscope of choice for a detailed three-dimensional study of the surface of a specimen is the

Accepted Answer

A)   scanning electron microscope.
B)   transmission electron microscope.
C)   light microscope.
D)   telescope.E) All of the above
F) A) and B)

Question 9

The lysosome is an example of a membrane-bound organelle.

Accepted Answer

A) True 
 B)False

Question 10

Water can cross cell membranes only by way of channel-mediated diffusion.

Accepted Answer

A) True 
 B)False

Question 11

Cartilage cells and intestinal lining cells are described as being cube-shaped.

Accepted Answer

A) True 
 B)False

Question 12

The fuzzy coat made of glycoproteins and glycolipids found on the external surface of the plasma membrane is called the ________.

Accepted Answer

The answer of The fuzzy coat made of glycoproteins and...

Question 13

The subunits of ribosomes are exported outside the nucleus into the cytoplasm, where they are assembled into their finished product.

Accepted Answer

A) True 
 B)False

Question 14

The potential across a cell membrane has changed drastically, from -90 mV to +30 mV. In other words,

Accepted Answer

A)   there is a positive charge on the inside of the cell, relative to the outside.
B)   there is a negative charge on the inside of the cell, relative to the outside.
C)   the resting membrane potential has been established.
D)   there is no relative charge difference between the inside and the outside of the cell.E) B) and C)
F) A) and D)

Question 15

Neurons have a ________ membrane potential of -70 mV. In other words, this is their stable membrane potential under normal conditions.

Accepted Answer

The answer of Neurons have a ________ membrane potential of...

Question 16

The term "flagellum" is appropriate for the structure it represents because it means

Accepted Answer

A)   an eyelid.
B)   the center.
C)   a nut or kernel.
D)   a whip.
E)   a bench.F) B) and E)
G) A) and D)

Question 17

As potassium diffuses down its concentration gradient, it moves out of the cell. However, this movement is resisted by the accumulating negative charge outside the cell.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following factors influence cell membrane permeability?

Accepted Answer

A)   Phospholipid composition of the membrane
B)   Ionic charge along the membrane
C)   Presence or absence of transport proteins
D)   Molecule size
E)   All of the choices are correct.F) A) and E)
G) All of the above

Question 19

Most cells perform pinocytosis.

Accepted Answer

A) True 
 B)False

Question 20

The sodium-potassium ATPase functions by performing

Accepted Answer

A)   primary active transport.
B)   secondary active transport.
C)   exocytosis.
D)   both exocytosis and endocytosis.
E)   receptor-mediated endocytosis.F) B) and D)
G) A) and B)

Exam 4: Biology of the Cell

As potassium diffuses down its concentration gradient, it moves out of the cell. However, this movement is resisted by the accumulating negative charge outside the cell.

Correct AnswerverifiedShow Answer

The subunits of ribosomes are exported outside the nucleus into the cytoplasm, where they are assembled into their finished product.

Correct AnswerverifiedShow Answer

The sodium-potassium ATPase functions by performing

Correct AnswerverifiedShow Answer

Which are the smallest components of the cytoskeleton?

Correct AnswerverifiedShow Answer

Which does not occur during the G2 phase?

Correct AnswerverifiedShow Answer

The microscope of choice for a detailed three-dimensional study of the surface of a specimen is the

Correct AnswerverifiedShow Answer

The lysosome is an example of a membrane-bound organelle.

Correct AnswerverifiedShow Answer

The potential across a cell membrane has changed drastically, from -90 mV to +30 mV. In other words,

Correct AnswerverifiedShow Answer

The term "flagellum" is appropriate for the structure it represents because it means

Correct AnswerverifiedShow Answer

The fuzzy coat made of glycoproteins and glycolipids found on the external surface of the plasma membrane is called the ________.

Correct AnswerverifiedShow Answer

Most cells perform pinocytosis.

Correct AnswerverifiedShow Answer

Neurons have a ________ membrane potential of -70 mV. In other words, this is their stable membrane potential under normal conditions.

Correct AnswerverifiedShow Answer

Cartilage cells and intestinal lining cells are described as being cube-shaped.

Correct AnswerverifiedShow Answer

Which statement is accurate?

Correct AnswerverifiedShow Answer

The term used to describe the fluid within a cell is ________, or intracellular fluid.

Correct AnswerverifiedShow Answer

Water can cross cell membranes only by way of channel-mediated diffusion.

Correct AnswerverifiedShow Answer

Osmosis is the diffusion of

Correct AnswerverifiedShow Answer

The sodium-potassium pump moves ions against their concentration gradients and helps maintain an electrochemical gradient across the plasma membrane.

Correct AnswerverifiedShow Answer

Everything packaged by the Golgi apparatus for secretion leaves the cell within a vesicle.

Correct AnswerverifiedShow Answer

Which of the following factors influence cell membrane permeability?

Correct AnswerverifiedShow Answer

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Which does not occur during the G₂ phase?

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