Biology ch.4
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