FINAL cell membrane

Question 1

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

Answer 1

freeze fracture

Question 2

a cell membrane is (how permeable)

Answer 2

semi permeable

Question 3

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

Answer 3

false

Question 4

t/f two halves of the plasma membrane are identical

Answer 4

false

Question 5

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

Answer 5

fluid-mosaic

Question 6

___, ___, ____ are lipids in the plasma membrane

Answer 6

phospholipids, glycolipids, cholesterol

Question 7

what three factors are responsible for membrane fluidity?

Answer 7

length of tails, type of tails, cholesterol

Question 8

plasma membrane proteins involved in both passive and active transport

Answer 8

transporters

Question 9

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

Answer 9

false

Question 10

molecules cross the plasma membrane

Answer 10

actively and passively

Question 11

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

Answer 11

transporter proteins and expenditure of energy

Question 12

the sugar coating on the surface of cells is due to

Answer 12

glycoproteins and glycolipids

Question 13

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

Answer 13

ion channeling

Question 14

four types of membrane proteins

Answer 14

receptors, transporters, linker/anchor, enzyme

Question 15

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

Answer 15

channel protein

Question 16

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

Answer 16

negative

Question 17

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

Answer 17

negative

Question 18

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

Answer 18

sodium/potassium pump

Question 19

what ions are transported by the sodium/potassium pump

Answer 19

Na+ K+

Question 20

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

Answer 20

phagocytosis

Question 21

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

Answer 21

diffusion

Question 22

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

Answer 22

osmosis

Question 23

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

Answer 23

oxygen, H2O, glucose, Na+

Question 24

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

Answer 24

hypertonic

Question 25

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

Answer 25

proteins

Question 26

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

Answer 26

endocytosis and exocytosis

Question 27

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

Answer 27

lipids, proteins

Question 28

when a cell is placed in a hypotonic solution

Answer 28

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

Question 29

when a cell is placed in a hypertonic solution

Answer 29

the water exits the cell and it shrivels up

Question 30

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

Answer 30

in the interior of the cell membrane

Question 31

phospholipids arrange themselves in

Answer 31

a double layer in the presence of water

Question 32

t/f dna is found in the cell membrane

Answer 32

false

Question 33

t/f the cell membrane is involved in dna replication

Answer 33

false

Question 34

is endocytosis a type of active or passive transport

Answer 34

active

Question 35

an animal cell placed in a hypotonic solution will

Answer 35

take on water

Question 36

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

Answer 36

active

Question 37

active transport requires

Answer 37

energy

Question 38

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

Answer 38

no

Question 39

how are solutions classified according to their comparartive tonicity

Answer 39

hypotonic and hypertonic

Question 40

what are the three basic constituents of the cell membrane

Answer 40

lipids, proteins, carbs

Question 41

(permeability) what type of membrane is the cell membrane

Answer 41

selectively permeable