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Biology > FINAL cell membrane > Flashcards

FINAL cell membrane Flashcards

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1
Q

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

A

freeze fracture

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2
Q

a cell membrane is (how permeable)

A

semi permeable

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3
Q

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

A

false

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4
Q

t/f two halves of the plasma membrane are identical

A

false

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5
Q

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

A

fluid-mosaic

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6
Q

___, ___, ____ are lipids in the plasma membrane

A

phospholipids, glycolipids, cholesterol

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7
Q

what three factors are responsible for membrane fluidity?

A

length of tails, type of tails, cholesterol

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8
Q

plasma membrane proteins involved in both passive and active transport

A

transporters

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9
Q

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

A

false

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10
Q

molecules cross the plasma membrane

A

actively and passively

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11
Q

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

A

transporter proteins and expenditure of energy

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12
Q

the sugar coating on the surface of cells is due to

A

glycoproteins and glycolipids

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13
Q

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

A

ion channeling

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14
Q

four types of membrane proteins

A

receptors, transporters, linker/anchor, enzyme

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15
Q

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

A

channel protein

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16
Q

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

A

negative

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17
Q

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

A

negative

18
Q

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

A

sodium/potassium pump

19
Q

what ions are transported by the sodium/potassium pump

A

Na+ K+

20
Q

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

A

phagocytosis

21
Q

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

A

diffusion

22
Q

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

A

osmosis

23
Q

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

A

oxygen, H2O, glucose, Na+

24
Q

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

A

hypertonic

25
Q

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

A

proteins

26
Q

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

A

endocytosis and exocytosis

27
Q

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

A

lipids, proteins

28
Q

when a cell is placed in a hypotonic solution

A

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

29
Q

when a cell is placed in a hypertonic solution

A

the water exits the cell and it shrivels up

30
Q

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

A

in the interior of the cell membrane

31
Q

phospholipids arrange themselves in

A

a double layer in the presence of water

32
Q

t/f dna is found in the cell membrane

A

false

33
Q

t/f the cell membrane is involved in dna replication

A

false

34
Q

is endocytosis a type of active or passive transport

A

active

35
Q

an animal cell placed in a hypotonic solution will

A

take on water

36
Q

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

A

active

37
Q

active transport requires

A

energy

38
Q

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

A

no

39
Q

how are solutions classified according to their comparartive tonicity

A

hypotonic and hypertonic

40
Q

what are the three basic constituents of the cell membrane

A

lipids, proteins, carbs

41
Q

(permeability) what type of membrane is the cell membrane

A

selectively permeable

Biology (19 decks)

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