What types of membrane activities require energy from ATP hydrolysis?

Na+ ions moving out of the cell

What is one way that the membranes of winter wheat remain fluid when it is extremely cold?

by increasing the percentage of unsaturated phospholipids

Why are lipids and proteins free to move laterally in membranes?

Hydrophilic portions of the lipids are in the interior

Cell membranes are asymmetrical. What is the most likely explanation for this?

Membrane proteins are determined while being packaged

What is true of the evolution of cell membranes?

As populations evolve, different properties are selected

The presence of cholesterol in the plasma membranes of some animals

enables the membrane to stay fluid

Familial hypercholesterolemia is characterized by?

defective LDL receptors on the cell membranes

Why does water pass quickly through cell membranes?

it moves through aquaporins in the membrane

What is a characteristic feature of a carrier protein in a plasma membrane?

it exhibits a specificity for a certain type of molecule

The difference between pinocytosis and receptor-mediated endocytosis is that

Pinocytosis brings mainly fluid into the cell

The sodium-potassium pump is called an electrogenic pump because it

contributes to the membrane potential

The movement of potassium into an animal cell requires

an energy source such as ATP or a proton gradient

Proton pumps are used by members of every organism kingdom. What does this most probably mean?

Cells with proton pumps were maintained in each Kingdom

What factors would tend to increase membrane fluidity?

greater proportion of unsaturated phospholipids

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AP Bio - Ch 7 Review

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Review of Ch 7

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Questions 28

Answers

1
What types of membrane activities require energy from ATP hydrolysis?
facilitated diffusion
Na+ ions moving out of the cell
movement of glucose molecules
movement of water into a cell
2
What is one way that the membranes of winter wheat remain fluid when it is extremely cold?
by increasing the percentage of cholesterol molecules
by decreasing the number of hydrophobic proteins
by increasing the percentage of unsaturated phospholipids
by using active transport
3
Why are lipids and proteins free to move laterally in membranes?
The interior of the membrane is filled with liquid water
No covalent bonds between lipid and protein in the membrane
There are only weak hydrophobic interactions in the interior
Hydrophilic portions of the lipids are in the interior
4
In the diagram, what is the structure labeled B
microfilament
glycolipid
cholesterol
hydrophobic tail
5
Cell membranes are asymmetrical. What is the most likely explanation for this?
all of the above
Cell membranes communicate signals
The membrane forms a border between one cell and another
Membrane proteins are determined while being packaged
6
What is true of the evolution of cell membranes?
As populations evolve, different properties are selected
An organism selects its preferred type of cell membrane
Cell membranes have stopped evolving
Cell membranes cannot evolve if proteins do not
7
The presence of cholesterol in the plasma membranes of some animals
enables the membrane to stay fluid
enable the animal to add hydrogen atoms
makes the animal more susceptible to circulatory diseases
enables the animal to remove hydrogen atoms
8
What often serve as receptors or cell recognition molecules on cell surfaces?
integral proteins
glycoproteins
integrins
peripheral proteins
9
In the diagram, what is the structure labeled D
carbohydrate
hydrophilic heads
peripheral protein
glycoprotein
10
Familial hypercholesterolemia is characterized by?
a poorly formed lipid bilayer
poor attachment of the cholesterol
defective LDL receptors on the cell membranes
a general lack of glycolipids
11
In order for a protein to be an integral membrane protein it would have to be?
hydrophilic
hydrophobic
amphipathic
lympathic
12
Which types of molecules are the major structural components of the cell membrane?
phospholipids and proteins
proteins and cellulose
phospholipids and cellulose
glycoproteins and cholesterol
13
What is the voltage across a membrane called?
chemical gradient
osmotic potential
water potential
membrane potential
14
Why does water pass quickly through cell membranes?
it moves through hydrophobic channels
it moves through aquaporins in the membrane
it is a small, polar, charged molecule
the bilayer is hydrophilic
15
What is a characteristic feature of a carrier protein in a plasma membrane?
it has only a few hydrophobic amino acids
it requires the use of cellular energy to function
it works against diffusion
it exhibits a specificity for a certain type of molecule
16
The difference between pinocytosis and receptor-mediated endocytosis is that
Pinocytosis requires cellular energy and the other doesn't
None of the above
Pinocyotosis increases the surface area
Pinocytosis brings mainly fluid into the cell
17
What are attached to the extracellular matrix?
integrins
glycoproteins
peripheral proteins
integral proteins
18
An organism with a cell wall would have the most difficulty doing which process?
osmosis
diffusion
active transport
phagocytosis
19
The sodium-potassium pump is called an electrogenic pump because it
contributes to the membrane potential
ionizes sodium and potassium atoms
pumps equal quantities of Na+ and K+ across the membrane
pumps hydrogen ions out of the cell
20
What are the membrane structures that function in active transport?
lipids
integral proteins
carbohydrates
peripheral proteins
21
White blood cells engulf bacteria through what process?
phagocytosis
exocytosis
pinocytosis
osmosis
22
The movement of potassium into an animal cell requires
low cellular concentrations of sodium
an energy source such as ATP or a proton gradient
high cellular concentrations of potassium
all of the above
23
Proton pumps are used by members of every organism kingdom. What does this most probably mean?
Cells with proton pumps were maintained in each Kingdom
Proton pumps are necessary to all cell membranes
Proton pumps are fundamental to all cell types
Proton pumps evolved before any organisms were on the earth.
24
What molecules are not embedded in the lipid bilayer at all?
intergral proteins
glycoproteins
peripheral proteins
transmembrane proteins
25
Based on the fluid mosaic model of cell membranes, what is a true about membrane phospholipids?
they are free to leave the membrane
they frequently flip-flop
they can move laterally
they have hydrophilic tails in the interior
26
What's used to load sucrose from photosynthesis into specialized cells in the veins of leaves?
a proton pump
an electrogenic pump
a contransport protein
all of the above
27
What factors would tend to increase membrane fluidity?
greater proportion of saturated phospholipids
lower temperature
all of the above
greater proportion of unsaturated phospholipids
28
What spans the phospholipids bilayer, usually a number of times?
peripheral proteins
glycoproteins
transmembrane proteins
integral proteins

AP Bio - Ch 7 Review Flashcards | StudBud