Lecture 5 Flashcards Preview

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Flashcards in Lecture 5 Deck (25):
1

Molecules can be transported...

actively or passively

2

What does active transport requires that passive doesn't?

energy

3

what is concentration gradient?

the difference in concentration of a substance from one location to another.

4

In passive transport, the molecules travel...

from an area of high concentration to an area of lower concentration

5

Active transport, the molecules travel...

from low concentration to high concentration

6

What is simple diffusion?

Small, nonpolar molecules can easily cross
the phospholipid bilayer as they interact well
with the hydrophobic region of the
membrane,

7

What is diffusion?

A form of passive transport

8

What is facilitated diffusion?

Larger charged and polar particles such as
ions (Cl-) and glucose need protein channels
(nonspecific) or carriers (specific) to diffuse
into the cell.

9

What is the rule of diffusion?

Substances ALWAYS travel from the area of
highest concentration to areas of lower
concentration, until equilibrium is reached.

10

Channel proteins generally carries ___ across the membrane

ions

11

What does carrier protein relies on?

concentration gradient

12

What determines the rate of carrier proteins?

the number of carriers present in the
membrane as the carrier

13

What is osmosis?

the term which refers to the diffusion
of water across a membrane

14

Most water uses a channel protein known as...

aquaporin

15

In terms of solute concentration water moves...

from the hypotonic to the hypertonic
environment

16

What is hydrostatic pressure?

the pressure of the
cytoplasm against the membrane

17

What is osmotic pressure?

the force of water
trying to enter the cell

18

What are uniporters?

carrier in active transport that transports one
molecule in one direction

19

what are symporters?

two
molecules in the same direction

20

what are antiporters?

two molecules in two directions

21

what is endocytosis?

the process by which the cell
will take in “large” quantities of material via
membrane vesicles

22

what is pagocytosis?

occurs when the cell takes up
solid matter, such as immune cells engulfing
pathogens

23

what is pinocytosis

is the engulfment of liquid

24

what is receptor mediated endocystosis?

Receptor mediated endocytosis occurs when
specific molecules bind to cell surface
receptors, and are then ingested by the cell

25

what is exocytosis?

Exocytosis is a pathway by which the cell
releases material using vesicles, such as the
release of hormones or neurotansmitters