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Multiple Choice Quiz
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1
The plasma membrane is composed primarily of _____.
A)phospholipids
B)carbohydrates
C)waxes
D)nucleic acids
2
The tails of the phospholipids are _____.
A)nonpolar
B)hydrophobic
C)directed inwards in the bilayer
D)all of the above
3
The amount of phospholipid extracted from red blood cells led researchers to propose that ____.
A)the phospholipids form a single layer around the cell
B)the phospholipids form a bilayer around the cell
C)there are not enough phospholipids to create a membrane around the cell
4
Electron micrographs support the _____ model of the plasma membrane.
A)sandwich
B)unit membrane
C)fluid-mosaic
5
According to the fluid-mosaic model, _____ are partially or wholly embedded in a fluid phospholipid bilayer.
A)nucleic acids
B)monosaccharides
C)proteins
D)triglycerides
6
All membranes appear the same in electron micrographs.
A)True
B)False
7
The plasma membrane is permeable to some nonlipid substances.
A)True
B)False
8
According to the fluid-mosaic model the hydrophilic heads of the phospholipids face the intra and extracellular fluids.
A)True
B)False
9
Phospholipids are the only type of lipid in the plasma membrane.
A)True
B)False
10
The permeability of most membranes is reduced by the presence of _____ in the membrane.
A)nucleotides
B)proteins
C)cholesterol
D)glycolipids
11
A sugar attached to a lipid is called a _____.
A)glycoplipid
B)disaccharide
C)monomer
D)glycoprotein
12
The plasma membrane is "sugar-coated" by _____.
A)glycolipids
B)gylcoproteins
C)both A and B
13
The proper functioning of some of the membrane proteins depends on the fluidity of the membrane.
A)True
B)False
14
Which of the following lipids may be found in the plasma membrane?
A)phospholipids.
B)cholesterol.
C)glycolipids.
D)all of the above.
15
The two halves of the plasma membrane are identical.
A)True
B)False
16
The plasma membrane is a stiff and rigid structure.
A)True
B)False
17
Glycolipids and glycoproteins vary from __________.
A)species to species
B)individual to individual
C)cell to cell
D)all of the above
18
Particular molecules or ions freely cross the plasma membrane with assistance from _____.
A)receptor proteins
B)cell recognition proteins
C)channel proteins
D)enzymatic proteins
19
Transplant rejections are the result of the immune system's response to foreign glycoproteins and glycolipids.
A)True
B)False
20
A person's blood type is determined by the presence of particular _____ in the red blood cells' membranes.
A)phospholipids
B)glycoproteins
C)steroids
D)nucleic acids
21
Receptor proteins in the plasma membrane bind to any kind of molecule.
A)True
B)False
22
Peripheral proteins are found within the plasma membrane.
A)True
B)False
23
Lipid-soluble molecules move freely across the plasma membrane.
A)True
B)False
24
Which of the following does NOT move freely (without energy or a carrier protein) across the plasma membrane?
A)H2O
B)steroids
C)Na+
D)O2
25
Which of the following requires energy?
A)diffusion
B)active transport
C)osmosis
D)facilitated transport
26
During diffusion molecules move from areas of low concentration to areas of high concentration.
A)True
B)False
27
The hydrophobic tails of the phospholipids in the plasma membrane are what prevent ions and charged molecules from freely crossing the membrane.
A)True
B)False
28
The sugar you stir into your coffee is an example of a _____.
A)solvent
B)solute
29
Osmosis is specifically about the movement of _____ in and out of cells.
A)sugars
B)proteins
C)water
D)oxygen
30
If the inside of a cell is 1% NaCl, which solution is isotonic to the cell?
A)0.01% NaCl
B)0.1% NaCl
C)1% NaCl
D)10% NaCl
31
If the inside of a cell is 1% NaCl, which solution is hypertonic to the cell?
A)0.01% NaCl
B)0.1 % NaCl
C)1% NaCl
D)10% NaCl
32
A hypotonic solution has fewer solutes than the cell.
A)True
B)False
33
Fluids and dissolved substances are transported into the cell by __________.
A)exocytosis
B)osmosis
C)diffusion
D)pinocytosis
34
Solutions that cause cells to neither gain nor lose water are known as ______ solutions.
A)isotonic
B)hypertonic
C)hypotonic
35
When a plant cell is placed in a hypotonic solution which of the following will occur?
A)The cell will swell and burst.
B)nothing
C)The central vacuole gains water.
D)The cell will shrink or shrivel up.
36
The term hemolysis refers to ______.
A)normal red blood cells
B)red blood cells that burst after being placed in a hypotonic solution
C)shrinking of the cytoplasm after a cell is placed in a hypertonic solution
D)the loss of turgor pressure in a plant cell
37
Carrier proteins are required for _____.
A)osmosis
B)facilitated transport
C)active transport
D)both B and C
38
Osmotic pressure affects _____.
A)water retention by the kidneys
B)water uptake from tissue fluids by the capillaries
C)water absorption from the large intestine
D)all of the above
39
Which of the following correctly describes facilitated transport?
A)It requires the expenditure of energy.
B)Molecules move from high concentration to low concentration.
C)Vacuoles form to move materials.
D)all of the above
40
Which of the following correctly describes active transport?
A)carrier proteins are needed.
B)it requires the expenditure of energy.
C)molecules move from areas of low concentration to areas of high concentration.
D)all of the above.
41
Insulin leaves insulin-secreting cells by _____.
A)phagocytosis
B)receptor-mediated endocytosis
C)osmosis
D)exocytosis
42
Macrophages, immune system cells, engulf bacteria by _____.
A)exocytosis
B)facilitated transport
C)phagocytosis
D)osmosis
43
Specific molecules enter cells by _____.
A)phagocytosis
B)receptor mediated endocytosis
C)diffusion
D)osmosis
44
The peptide hormone, follicle stimulating hormone, would activate its specific target cells by _____.
A)diffusing into the cells
B)binding a receptor protein in the plasma membranes
C)phagocytosis
45
Bacteria, fungi and plants all have an extracellular component called a cell wall.
A)True
B)False
46
Woody plants are characterized by _____.
A)a secondary cell wall
B)the absence of a cell wall
C)numerous desmosomes
D)collagen
47
The extracellular matrix of animal cells supports them and fills the spaces between the cells.
A)True
B)False
48
Plant cells are able to exchange materials through _____.
A)gap junctions
B)plasmodesmata
C)tight junctions
D)desmosomes
49
People may get injections of _____, a component of the extracellular matrix of animal cells, to get rid of their wrinkles.
A)collagen
B)cholesterol
C)cellolose
D)chromatin
50
Organs with tissues that get stretched a lot like the heart and bladder are characterized by _____.
A)tight junctions
B)adhesion junctions
C)plasmodesmata
D)gap junctions
51
Tight junctions between cells make tissues leakproof.
A)True
B)False
52
Heart cells are able to contract in unison because of the flow of ions through _____.
A)gap junctions
B)tight junctions
C)plasmodesmata
D)adhesion junctions
53
All cells have a _____.
A)cell wall
B)plasma membrane
C)nucleus
D)flagellum
54
The plasma membrane allows anything to move freely in or out of the cell.
A)True
B)False







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