AP Bio Test

Question 1

Define selective permeability

Answer 1

Movement of a molecule through a membrane depends on the interaction of the molecule with the hydrophobic interior of the membrane

Question 2

Structure + function of carrier proteins?

Question 3

Define diffusion

Answer 3

-movement of molecules of any substance to spread out in the available space
-result of the thermal energy of molecules
-random movements
-population of molecules may be directional

Question 4

Define osmosis

Answer 4

Diffusion of free water across a selectively permeable membrane

Question 5

Hypertonic

Answer 5

A solution when surrounding a cell, will cause cell to lose water

Question 6

Hypotonic

Answer 6

A solution when surrounding a cell, will cause cell to take up water

Question 7

Isotonic

Answer 7

A solution when surrounding a cell, causes no net movement of water in or out of cell

Question 8

Osmoregulation

Answer 8

Regulation of solute concentrations and water balance by a cell or organism (control of water balance)

Question 9

Phagocytosis

Answer 9

Type of endocytosis in which large particulate substances or small organisms are taken up by a cell

Question 10

Pinocystosis

Answer 10

Type of endocytosis in which the cell ingests extracellular fluid and its dissolved solutes

Question 11

Receptor-mediated Exosytosis

Answer 11

The movement of specific molecules into a cell by the infolding of vesicles containing proteins with receptor sites specific to the molecules being taken in ; enables a cell to acquire bulk quantities of specific substances

Question 12

Active Cell Transport Process

Answer 12

-requires cell to expend energy to move molecules against their concentration gradient
-tends to use carrier proteins rather than channel
-enables a cell to maintain internal concentration of molecules that would otherwise diffuse across a membrane
-ATP supplies the energy for most active transport