Biology ch.4

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The energy to conduct active transport comes from ___.

ATP

Cholesterol is a common carbohydrate on the surface of the plasma membrane.

F

Dioxygen passes into the cell by active transport.

F

During exocytosis vesicles form along the outer edge of the plasma membrane.

F

Enzymatic proteins are embedded in the plasma membrane and actively transport water out of the cell.

F

Exocytosis is a passive type of cell transport.

F

Glucose passes into the cell by active transport.

F

Large molecules can only cross the plasma membrane by active transport.

F

Phagocytosis is the process by which red blood cells engulf invading bacteria.

F

Phospholipids have a hydrophobic head and hydrophilic tails.

F

Phospholipids have three fatty acid tails.

F

Protein pumps move materials along a concentration gradient.

F

Proteins in the plasma membrane are in fixed positions.

F

Receptor molecules typically occur on the inside of the membrane.

F

The GLUT carrier proteins allow insulin to freely cross the plasma membrane.

F

The current model of membrane structure is the lipid fusion model.

F

The process by which carbon dioxide enters the blood is known as osmosis.

F

When a plant cell is placed in a solution of 90% water, the plant cell will ____.

Plasmolyse

Which of these is not a component of the cell membrane?

RNA

A solute is typically a solid dissolved in a liquid.

T

Charged ions cannot diffuse directly across the membrane.

T

Diffusion is the movement of materials from a high to a low concentration gradient.

T

Endocytosis is the process where vesicles form along the outer edge of the plasma membrane.

T

Exocytosis functions during secretion of products made by the endomembrane system.

T

Glycoproteins and glycolipids participate in the recognition of self-process by which the body's immune system identifies its own cells.

T

Integral proteins span across the membrane.

T

Isotonic solutions have equal concentrations of solutes.

T

Phospholipids align tail to tail to form the bilayer.

T

Phospholipids have a polar head and nonpolar tails.

T

Plasma membranes acts as selectively permeable barriers.

T

The MHC proteins influence the suitability of an organ match between donor and recipient.

T

The current model of the membrane structure is the fluid mosaic model.

T

The free energy of the system powers the passive transport processes.

T

Up to one-third of the energy needed during sleep goes to the operation of the sodium-potassium pump.

T

Water crosses the membrane by the process of osmosis.

T

Which of these transport processes is operating in the transmission of a nerve message from the fingertips to the brain?

all of these are involved in the transmission of a nerve message

Water crosses the plasma membrane through special channels known as _____.

aquaporins

When a plant cell is placed in a solution of 100% water, the plant cell will ____.

become turgid

Glycolipids and glycoproteins function as ____ in the cell membrane.

cell recognition components

An example of vesicle-mediated transport would be ___.

cell secretion by exocytosis

The ______ is a structure found in many protozoans that removes/pumps excess water from the cell.

contractile vacuole

When a red blood cell is placed in a solution of 90% water, the cell will ____.

crenate

The genetic human disease cystic fibrosis occurs when people produce _____.

defective chloride ion channels that cannot transport chloride out of the cell

During breathing, the dioxygen and carbon dioxide molecules are exchanged by what cell transport process?

diffusion

When a white blood cell engulfs an invading bacterium, what cell transport process operates?

endocytosis

Molecules tend to move until they reach a state known as ____ with equal concentrations of molecules over the given volume of space.

equilibrium

Which of these transport mechanisms accomplishes passage of glucose from the blood into a cell?

facilitated diffusion

Cholesterol occurs in animal cell membranes and provides ____.

flexibility

The GLUT carrier proteins transport only _____ across the plasma membrane.

glucose

The hormone that activates or opens the GLUT carriers is _____.

insulin

If the inside of a cell is 99% water, what term is applied to that cell when it is placed in a solution of 99% water?

isotonic

When a red blood cell is placed in a solution of 100% water, the cell will ____.

lyse

The term applied when water passes through a selectively permeable membrane from an area of high to low concentration is ___.

osmosis

The MHC chemicals in our plasma membranes are what type of molecule?

proteins

When a plant cell is placed in a solution of 99% water, the plant cell will ____.

remains unchanged

The energy to power passive transport comes from ___.

the free energy of the system

Potatoes, like most cells, are composed of approximately 99% water. When freshly peeled potatoes are placed into a bowl of pure water, what will happen to the potatoes?

the potatoes will absorb some of the water and become firmer

A phospholipid has _____ fatty acid tails.

two


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