FINAL cell membrane Flashcards Preview

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Flashcards in FINAL cell membrane Deck (41):
1

what technique was used to determine the current model of the cell membrane

freeze fracture

2

a cell membrane is (how permeable)

semi permeable

3

t/f animal cells have a cell wall that is formed outside the membrane

false

4

t/f two halves of the plasma membrane are identical

false

5

the_____ model of membrane structure has two components, lipids and proteins, and is widely accepted at this time

fluid-mosaic

6

___, ___, ____ are lipids in the plasma membrane

phospholipids, glycolipids, cholesterol

7

what three factors are responsible for membrane fluidity?

length of tails, type of tails, cholesterol

8

plasma membrane proteins involved in both passive and active transport

transporters

9

t/f the cell membrane is highly permeable to all ions

false

10

molecules cross the plasma membrane

actively and passively

11

(2) are needed to transport molecules against their concentration gradient

transporter proteins and expenditure of energy

12

the sugar coating on the surface of cells is due to

glycoproteins and glycolipids

13

the electrical and chemical attraction an ion has to cross a membrane in a particular direction

ion channeling

14

four types of membrane proteins

receptors, transporters, linker/anchor, enzyme

15

type of membrane transport protein which forms an aqueous pore and is involved in passive transport

channel protein

16

what is the charge on the inside of the cell was during resting membrane potential

negative

17

what is the charge of the outside of the cell wall during the action potential

negative

18

what protein allows for cells to return to the resting membrane potential

sodium/potassium pump

19

what ions are transported by the sodium/potassium pump

Na+ K+

20

the active transport process which is initiated by the binding of a ligand to a receptor

phagocytosis

21

movement of molecules from an area of greater concentration to an area of lesser concentration

diffusion

22

movement of water from an area of greater concentration to an area of lesser concentration

osmosis

23

list glucose, Na+, H2O, oxygen in order of decreasing membrane permeability

oxygen, H2O, glucose, Na+

24

sample of cells is placed in a salt solution, they shrink and the membrane is distorted, the solution is probably

hypertonic

25

component of a cell membrane that is likely to function as a receptor in cell to cell signaling

proteins

26

bringing nutrient containing particles in from the outside of the cell, and the oopposite

endocytosis and exocytosis

27

___ part of cell is a barrier, ___ determines specific functions

lipids, proteins

28

when a cell is placed in a hypotonic solution

water enters the cell toward the higher particle concentration and it swells up

29

when a cell is placed in a hypertonic solution

the water exits the cell and it shrivels up

30

a phospholipid molecule has a head and two tails, the tails are found

in the interior of the cell membrane

31

phospholipids arrange themselves in

a double layer in the presence of water

32

t/f dna is found in the cell membrane

false

33

t/f the cell membrane is involved in dna replication

false

34

is endocytosis a type of active or passive transport

active

35

an animal cell placed in a hypotonic solution will

take on water

36

are Na+/K+ pump, endocytosis, and exocytosis active or passive transport

active

37

active transport requires

energy

38

can solutions with the same concentration of different solutes have different osmotic pressures

no

39

how are solutions classified according to their comparartive tonicity

hypotonic and hypertonic

40

what are the three basic constituents of the cell membrane

lipids, proteins, carbs

41

(permeability) what type of membrane is the cell membrane

selectively permeable