cell membrane 2

Question 1

what’s the average composition of the cell membrane

Answer 1

55% proteins
45% lipids
small amount of carbohydrates

Question 2

what are the type of lipids found in the cell membrane

Answer 2

phospholipids
sphingolipids
cholesterol

Question 3

what does amphipathic mean

Answer 3

one region that really likes water and one region that doesn’t

Question 4

what does cholesterol do?

Answer 4

makes the cell have more viscosity because phospholipids are so fluent that they’d just fall apart

Question 5

what’s the major lipid in the cell membrane

Answer 5

phospholipid

Question 6

what lipids are involved in lipid rafts

Answer 6

sphingolipids

Question 7

what are the main categories of cell membrane proteins (2)

Answer 7

integral and peripheral

Question 8

what is an integrated protein?

Answer 8

its integrated into the membrane. transmembrane proteins and lipid anchored proteins

Question 9

what is a peripheral protein

Answer 9

its not attached to the membrane
attached to integral proteins

Question 10

what is caveolae

Answer 10

the area of the membrane that sinks in rather than comes out

Question 11

what are the two types of lips rafts

Answer 11

planar lipid rafts
caveolae

Question 12

what side of the membrane are cell membrane carbohydrates always on

Answer 12

extracellular

Question 13

what’s a glycoprotein

Answer 13

protein with a carbohydrate attached on the extracellular membrane

Question 14

what’s a glycolipid

Answer 14

lipid with a carbohydrate attached on the extracellular layer

Question 15

what are glycolipids and glycoproteins used for ?

Answer 15

cell to cell recognition
identify antigens
cell to cell interactions

Question 16

is stuff always moving between body fluid compartments

Answer 16

always moving between

Question 17

what does the ECF consist of

Answer 17

interstitial fluid
blood plasma

Question 18

what is blood plasma

Answer 18

the liquid in the matrix of the bloood

Question 19

what is the interstitial fluid

Answer 19

it lies between the circulatory system and the cell

Question 20

how much % of the body is water

Answer 20

60%

Question 21

which gender has lower total body content ? why?

Answer 21

females - adipose tissue

Question 22

what is adipose tissue

Answer 22

basically fast tissue

Question 23

what does skeletal muscle become as we age

Answer 23

adipose tissue

Question 24

what is the majority of adipose tissue made of

Answer 24

lipids (90%)
the rest is water

Question 25

what does less body fat mean in relation to water

Answer 25

the less body fat, the more water

Question 26

what is equal is osmotic equilibrium?

Answer 26

fluid concentration - amount of solute per volume solution

Question 27

what is osmosis

Answer 27

the movement of water across a membrane in response to a solute concentration gradient

Question 28

what are aquaporins

Answer 28

water channels

Question 29

are aquaporins always open

Answer 29

yes

Question 30

intracellular fluid is ________ charged compared to extracellular fluid

Answer 30

negatively

Question 31

what is osmotic pressure

Answer 31

quantifying the drive for fluid movement across a selectively permeable membrane

Question 32

is osmotic pressure measurable

Answer 32

yes

Question 33

what does osmolarity describe

Answer 33

the number of solute particles dissolved in a solution

Question 34

what does osmotically active particles mean

Answer 34

of particles that will drive osmosis

Question 35

what does tonicity describe

Answer 35

a solution in reference to a cell volume changes

Question 36

is tonicity measurable

Answer 36

no it is not a meaurable term
it is observable/ comparable

Question 37

what’s a bad thing about osmolarity

Answer 37

it doesn’t tell you what happens to a cell

Question 38

what does tonicity depend on

Answer 38

the concentration of non penetrating solutes

Question 39

can water move freely between ECF and ICF

Answer 39

yes