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1

The type of membrane protein responsible for rejection in tissue transplants is the ____________.
A)receptor protein
B)cell surface protein
C)cellular adhesion molecule
D)transport protein
2

The most abundant molecules found in cell membranes are _____________.
A)glycoproteins
B)glycolipids
C)phospholipids
D)sterols
3

The portion of the cell membrane responsible for preventing the passage across the membrane of substances dissolved in water is/are the ________________.
A)regulatory proteins
B)transport proteins
C)hydrophobic interior of the cell membrane
D)hydrophilic portions of the cell membrane
4

True or false. Proteins within the lipid bilayer of the cell membrane can move laterally about within the membrane.
A)True
B)False
5

True or false. The protein to phospholipid ratio in both cell and organelle membranes has an important role in the functioning of the cell or organelle and may affect the health of an individual.
A)True
B)False
6

A given aqueous solution is dilute. This means the solute concentration is ___________ while the solvent concentration is proportionately ____________.
A)high; low
B)low; high
C)low; low
D)It is impossible to tell from the information given here.
7

Simple diffusion is defined as ______________.
A)movement of molecules across a membrane from low to high concentration
B)movement of molecules down a concentration gradient
C)movement of water across a membrane from a low solute concentration to a high solute concentration
D)movement of solute up a concentration gradient
8

If there are no active transport systems at work, when does net diffusion cease?
A)never
B)after 2 hours
C)when dynamic equilibrium is reached
D)when the temperature drops
9

If a hypertonic salt solution surrounds red blood cells, in what direction is there net movement of water?
A)into the cells
B)out of the cells
C)there is no net movement
10

When red blood cells are placed in distilled water they swell and burst. What prevents plant cells from bursting under the same circumstances?
A)plant cells are unaffected by distilled water
B)animal cell membranes are structurally weaker than plant cells
C)plant cells have cell walls which prevent them from bursting
D)plant cells have contractile vacuoles
11

Energy for active transport is most commonly provided directly by ____________.
A)water
B)ATP
C)phosphate
D)glucose
12

A type of transport across a membrane in which a protein carries one substance as it ferries another substance down a concentration gradient is called _____________.
A)facilitated transport
B)active transport
C)cotransport
D)passive transport
13

The sodium-potassium pump is an example of _____________.
A)facilitated transport
B)active transport
C)cotransport
D)passive transport
14

A chemical neurotransmitter from a motor neuron is released by ______________.
A)exocytosis
B)endocytosis
C)facilitated transport
D)cotransport
15

What factor(s) is/are involved in the specificity of receptor-mediated endocytosis?
A)channel protein
B)ligand
C)carrier protein
D)cell surface protein
16

The selective and rapid transport of material from one end of the cell to another, such as how monomers of nutrient molecules are passed across the cells lining of the digestive system, is called _______________.
A)facilitated diffusion
B)passive transport
C)transcytosis
D)exocytosis
17

Microtubules are made of pairs (dimers) of which protein?
A)tubulin
B)dynein
C)myosin
D)actin
18

Microtubules are coupled with which motor molecule (protein) to enable cells to move?
A)tubulin
B)dynein
C)myosin
D)actin
19

Cilia and flagella are built of a ____________ array of microtubules.
A)random
B)ordered
C)9 + 2
D)18 + 4
20

Microfilaments are made of the protein ____________ and often associate with another protein called __________, as is seen in muscle cells.
A)actin; tubulin
B)keratin; dynein
C)actin; myosin
D)myosin; keratin
21

In the bottommost layer of the epidermis, __________________ form a supportive framework.
A)microtubules
B)intermediate filaments
C)microfilaments
D)All of these are correct.
22

The blood-brain barrier occurs as a result of numerous______________ between capillary cells.
A)tight junctions
B)desmosomes
C)gap junctions
D)intermediate filaments
23

The region where the walls of adjacent plant cells meet is the ____________.
A)desmosome
B)middle lamella
C)plasmodesmata
D)rhizoid
24

What is the first protein in the sequence of cellular adhesion molecules (CAMs) that acts to slow down the white blood cell in the bloodstream?
A)dynein
B)selectin
C)integrin
D)None of these is correct.
25

Most types of signal transduction start by interaction with molecules found in _____________.
A)the nucleus
B)the mitochondrion
C)the endoplasmic reticulum
D)the cell membrane





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