The Cellular Level Of Organization

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Question 1
Free
Multiple Choice

What is an advantage of the electron microscope over the compound light microscope?

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A

It can function in complete darkness.

B

It is older, more reliable technology.

C

It is less expensive.

D

It allows much greater magnification of a specimen.

E

It is portable.

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Question 2
Free
Multiple Choice

The smallest living unit within the human body is

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A

a protein.

B

a cell.

C

a tissue.

D

an organ.

E

an organ system.

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Question 3
Free
Multiple Choice

The cell theory includes all of these concepts except

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A

each cell maintains homeostasis at the cellular level.

B

cells are the smallest units that carry out the essential functions of life.

C

cells are the building blocks of all organisms.

D

all cells come from the division of preexisting cells.

E

every cell is capable of living on its own if isolated from the body.

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Question 4
Free
Multiple Choice

The only kind of cell in the body that is not produced by the division of preexisting cells is

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A

a gamete (sperm or egg cell).

B

a neuron (nerve cell).

C

an osteocyte (bone cell).

D

none, because every cell is produced by the division of another cell.

E

a liver cell.

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Question 5
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Multiple Choice

What would be an example of a cell maintaining homeostasis at the cellular level?

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A

a cell of the intestine secretes digestive enzymes

B

a muscle cell contracts

C

a sperm fertilizes an egg

D

a cell takes up potassium to maintain the proper cytoplasmic potassium concentration

E

a cell divides to become two cells

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Question 6
Multiple Choice

Cytology is the study of

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A
biological macromolecules.
B
causes and treatment of cancer.
C
the origins of life on Earth.
D
genes and their function.
E
the structure and function of cells.
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Question 7
Multiple Choice

________ cells are all of the cells of the body except the reproductive cells (sperm and oocytes).

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A
Core
B
Somatic
C
Corpus
D
Main
E
Primary
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Question 8
Multiple Choice

Most cells have only one

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A
nucleus.
B
ribosome.
C
peroxisome.
D
lysosome.
E
mitochondrion.
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Question 9
Multiple Choice

The extracellular fluid in most tissues is called ________ fluid.

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A
interstitial
B
cytosolic
C
cytoplasmic
D
outside
E
peripheral
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Question 10
Multiple Choice

What is a structure that separates the contents of a human cell from its surrounding medium?

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A
cell wall
B
tissue
C
plasma membrane
D
skin
E
nucleus
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Question 11
Multiple Choice

If a hole is torn in a cell's plasma membrane, the cell will die because

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A
it will not be able to maintain differences between the cytoplasm and extracellular fluid.
B
germs are attracted toward cytoplasm leaking from a cell.
C
it will not be able to undergo cell division.
D
its chromosomes will not be held in place.
E
cells can only make more plasma membrane during cell division.
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Question 12
Multiple Choice

What is the first part of the cell that is affected when the pH of extracellular fluid changes?

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A
the nucleus
B
the nucleolus
C
the cytosol
D
the plasma membrane
E
the cytoskeleton
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Question 13
Multiple Choice

How is the plasma membrane involved in structural support of body tissues?

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A
It has specialized connections to other cells or extracellular materials.
B
It primarily consists of fibrous proteins.
C
It is inflated by cytoplasm at high pressure.
D
Tissues are largely composed of empty plasma membranes left by dead cells.
E
It is hydrophobic, so it repels extracellular fluid and attracts the membranes of other cells.
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Question 14
Multiple Choice

Functions of the plasma membrane include all of the following except

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A
separation of the cytoplasm from the extracellular fluid.
B
regulation of exchange of materials with the extracellular environment.
C
sensitivity to chemical changes in the extracellular fluid.
D
thermal insulation.
E
structural support.
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Question 15
Multiple Choice

Which of the following is not a function of membrane proteins?

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A
bind to ligands
B
regulate the passage of ions
C
act as carrier molecules for various solutes
D
act as anchors or stabilizers for the cell membrane
E
store cellular nutrients
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Question 16
Multiple Choice

Most of the surface area of a plasma membrane consists of

Choose correct answer/s
A
a protein bilayer.
B
a phospholipid bilayer.
C
carbohydrate molecules.
D
DNA.
E
cells.
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Question 17
Multiple Choice

The tails of a phospholipid molecule in a plasma membrane are

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A
hydrophilic.
B
composed of amino acids.
C
hydrophobic.
D
facing the cytosol.
E
interlocked to provide membrane strength.
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Question 18
Multiple Choice

The plasma membrane does not include

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A
integral proteins.
B
glycolipids.
C
phospholipids.
D
cholesterol.
E
silk mesh.
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Question 19
Multiple Choice

Identify the role of cholesterol in the plasma membrane.

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A
enables ions to pass
B
forms enzymes
C
reduces membrane fluidity and permeability
D
anchors the phospholipids
E
provides energy
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Question 20
Multiple Choice

image
Figure 3-1 The Plasma membrane
Use Figure 3-1 to answer the following questions.
-What part of the plasma membrane is hydrophobic?

Choose correct answer/s
A
2
B
3
C
4
D
5
E
6
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