BIO 110 CHAPTER 5 EXAM
QUESTIONS WITH VERIFIED
ANSWERS
Active Transport - Correct Answers -Transport of materials across the plasma
membrane in which energy is expended. Through active transport solutes can be
moved against their concentration and electrical gradients. The sodium-potassium
pump is an example of active transport.
Concentration Gradient - Correct Answers -A gradient within a given medium defined by
the difference between the highest and lowest concentrations of a solute. The solute will
have a natural tendency to move from the areas of higher concentration to lower thus
diffusing.
Diffusion - Correct Answers -The movement of molecules or ions from areas of their
higher concentration to areas of their lower concentration . Over time the random
movement of molecules will result in the even distribution of the material.
Endocytosis - Correct Answers -The process by which cells bring relatively large
material sinto themselves through use of transport vesicles.
Exocytosis - Correct Answers -The means by with relatively large volumes of material
are moved from the inside of a cell to the outside. In exocytosis a transport vesicle fuses
with a cell's plasma membrane after which the contents of the vesicle are ejected
outside the cell.
Facilitated Diffusion - Correct Answers -A passage of materials through the cell's
plasma membrane that is aided by a transport protein.
Fluid-Mosaic Model - Correct Answers -A conceptualization of the cell's plasma
membrane as a fluid phospholipid bilayer that has within it a mosaic of both stationary
and mobile proteins.
Glycocalax - Correct Answers -An outer layer of the plasma membrane composed of
short carbohydrate chains that attach to membrane proteins and phospholipid
molecules. Such chains serve as the actual binding sites on many membrane proteins
act to lubricate the cell and can form an adhesion layer that allows one cell to stick to
another.
QUESTIONS WITH VERIFIED
ANSWERS
Active Transport - Correct Answers -Transport of materials across the plasma
membrane in which energy is expended. Through active transport solutes can be
moved against their concentration and electrical gradients. The sodium-potassium
pump is an example of active transport.
Concentration Gradient - Correct Answers -A gradient within a given medium defined by
the difference between the highest and lowest concentrations of a solute. The solute will
have a natural tendency to move from the areas of higher concentration to lower thus
diffusing.
Diffusion - Correct Answers -The movement of molecules or ions from areas of their
higher concentration to areas of their lower concentration . Over time the random
movement of molecules will result in the even distribution of the material.
Endocytosis - Correct Answers -The process by which cells bring relatively large
material sinto themselves through use of transport vesicles.
Exocytosis - Correct Answers -The means by with relatively large volumes of material
are moved from the inside of a cell to the outside. In exocytosis a transport vesicle fuses
with a cell's plasma membrane after which the contents of the vesicle are ejected
outside the cell.
Facilitated Diffusion - Correct Answers -A passage of materials through the cell's
plasma membrane that is aided by a transport protein.
Fluid-Mosaic Model - Correct Answers -A conceptualization of the cell's plasma
membrane as a fluid phospholipid bilayer that has within it a mosaic of both stationary
and mobile proteins.
Glycocalax - Correct Answers -An outer layer of the plasma membrane composed of
short carbohydrate chains that attach to membrane proteins and phospholipid
molecules. Such chains serve as the actual binding sites on many membrane proteins
act to lubricate the cell and can form an adhesion layer that allows one cell to stick to
another.
