Lecture 7

Question 1

Amphipathic molecule

Answer 1

Molecule having both a hydrophilic region and hydrophobic region

Question 2

Concentration gradient

Answer 2

Concentration gradientA region along which the density of a chemical substance increases or decreases

Question 3

Cotransport

Answer 3

The coupling of the downhill diffusion of one substance of the uphill transport of another against it’s own concentration gradient

Question 4

Diffusion

Answer 4

The spontaneous movement of a substance down its concentration gradient from a region where it’s more concentrated to a region where it is less concentrated

Question 5

Endocytosis

Answer 5

Cellular uptake of biological molecules and particulate matter via formation of new vesicles from the plasma membrane

Question 6

Exocytosis

Answer 6

The cellular secretion of biological molecules by the fusion of vesicles containing them with the plasma membrane

Question 7

Facilitated diffusion

Answer 7

The spontaneous passage of molecules or ions across A biological membrane with the assistance of specific transmembrane transport proteins

Question 8

Gated channel

Answer 8

Hey transmembrane protein channel that opens or closes in response to a particular stimulus

Question 9

Hypertonic solution

Answer 9

Referring to a solution that when surrounding the cell will cause the cell to lose water

Question 10

Hypotonic solution

Answer 10

Referring to a solution that once running to sell because the cell to take up water

Question 11

Isotonic solutions

Answer 11

Referring to a solution that when surrounding the cell has no effect on the passage of water into or out of the cell

Question 12

Ligand

Answer 12

A molecule that binds specifically to another molecule usually larger one

Question 13

Osmosis

Answer 13

Diffusion through water

Question 14

Passive transport

Answer 14

The diffusion of a substance across a biological membrane with no expenditure of energy

Question 15

Peripheral proteins

Answer 15

A protein loosely bound to the surface of the membrane or to the part of an integral proteins and not embedded in the lipid bilayer

Question 16

Phagocytoses

Answer 16

A type of endocytosis in which large particular substances are taken up by a cell

Question 17

Pinocytosis

Answer 17

A type of endocytosis in which the cell and just extracellular fluid and is dissolved solute

Question 18

Receptor – mediated endocytosis

Answer 18

The movement of specific molecules into the cell by the Inward budding of membrane vesicles containing proteins with receptor site specific to the molecules being taken in

Question 19

Selective permeability

Answer 19

A property of biological membranes that allows them to regulate the passage of substances

Question 20

Sodium – potassium pump

Answer 20

The transport proteins in the plasma membrane of animal cells that actively transport sodium out of the cell and potassium into the cell

Question 21

Transport proteins

Answer 21

Transmembrane protein that helps a certain substance or class of closely related substances to cross the membrane

Question 22

Active transport

Answer 22

The movement of a substance across the cell membrane