Lecture 7 Flashcards Preview

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Flashcards in Lecture 7 Deck (22):
1

Amphipathic molecule

Molecule having both a hydrophilic region and hydrophobic region

2

Concentration gradient

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

3

Cotransport

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

4

Diffusion

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

5

Endocytosis

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

6

Exocytosis

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

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Facilitated diffusion

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

8

Gated channel

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

9

Hypertonic solution

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

10

Hypotonic solution

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

11

Isotonic solutions

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

12

Ligand

A molecule that binds specifically to another molecule usually larger one

13

Osmosis

Diffusion through water

14

Passive transport

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

15

Peripheral proteins

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

16

Phagocytoses

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

17

Pinocytosis

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

18

Receptor – mediated endocytosis

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

19

Selective permeability

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

20

Sodium – potassium pump

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

21

Transport proteins

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

22

Active transport

The movement of a substance across the cell membrane