Question

what does it mean to say that the cell membrane is semi permeable/selectively permeable?

Answer 1

can some body help me

Answer 2

http://education-portal.com/academy/lesson/selectively-permeable-membranes-definition-examples-quiz.html
This should help. (:

Answer 3

It means that this particular membrane allows only certain molcules to pass through, but not others

Answer 4

what is a gradient?

Answer 5

why is this so Important to life ?

Answer 6

A semipermeable membrane also termed a selectively permeable membrane a partially permeable membrane or a deferentially permeable membrane is a type of biological membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized (facilitated diffusion)

Answer 7

selective membrane is... all cells are enclosed with a cell membrane A selectively permeable cell membrane is one that allows certain molecules or ions to pass through it by means of active or passive transport.

Answer 8

PHYSICS gradient
an increase or decrease in the magnitude of a property (e.g., temperature, pressure, or concentration) observed in passing from one point or moment to another.

Answer 9

gradient meaning in biology The rate of change in growth, metabolism, or physiological activity of a cell or organism.

Answer 10

A concentration gradient is the concentration that exists between a two different areas.

Take osmosis for example. This is when water passes through a semi permeable membrane to another area. It tries to stay balanced between the two areas. So a concentration gradient is the concentration of water on each side on the semi permeable membrane.

When something moves against the concentration gradient it means it is not trying to "get equal". Going back to the water example. It would not try to pass through the membrane to get equal. When it goes against the gradient it's called active diffusion. Meaning it goes from a place of low concentration to high concentration. This is like trying to roll a boulder up a hill. So active diffusion requires the use of ATP to make this happen. So when they say it is moving against the concentration gradient they mean active diffusion.

Answer 11

i love helping you but sometimes my help is really comlpicated

Answer 12

you are so sweet

Answer 13

in regard to osmosis

Answer 14

XD

Answer 15

i love you too

Answer 16

awww

Answer 17

any other questions ?

Answer 18

how do strawberries soaking in sugar make their own sauce for strawberry shortcake?

Answer 19

wow

Answer 20

you got me here

Answer 21

lol

Answer 22

is that an actual legit question

Answer 23

one thats understandable and formal

Answer 24

idk

Answer 25

XP

Answer 26

its biology

Answer 27

lol

Answer 28

so in biology how do strawberries soaking in sugar make their own sauce for strawberry shortcake?

Answer 29

why is this so Important to life ? this for my first question that you answered

Answer 30

is there an answer choice ?

Answer 31

no

Answer 32

why is gradient important ?

Answer 33

in regard to osmosis:

Answer 34

take this "gradient meaning in biology The rate of change in growth, metabolism, or physiological activity of a cell or organism."

Answer 35

if you didnt have osmosis your cells would probably die

Answer 36

if you didnt have gradient your cells wouldnt be active and therefore die

Answer 37

what does it mean to say that the cell membrane is semi permeable/selectively permeable?
why is this so important to life?

Answer 38

osmosis is important to cells because osmosis is the way in which many living organisms take up water. water will move into plant cells and around the plant with osmosis. while in animal cells water passes into the cells by osmosis, just that in animal cells there are no cell walls to stop the swelling therefore they burst.

Answer 39

Oh that question

Answer 40

do you know this one? how do strawberries soaking in sugar make their own sauce for strawberry shortcake?

Answer 41

i dont know that one

Answer 42

unfortunately

Answer 43

ok

Answer 44

so what do you need help on?

Answer 45

A cell needs a selectively permeable membrane in order to maintain a balance of water in the cell and the ability to bring in glucose and other items it needs for both DNA and RNA processing along with waste removal.

At the same time, materials that may be harmful to the cell must be kept out of the cell, and its ability to differentiate between those that are necessary and those that are not needed keeps the cell healthy.

Answer 46

there is that i tried to get as specific as possible

Answer 47

Semi permeable membranes allow the cell to keep a isotonic state. The amount of water is the same inside as outside the cell When there is more water outside the cell water would come in to the cell and the cell could burst If the amount of water is less outside the cell then water would rush out and the cell would shrink This is especially important for cells that are in an environment that is not isotonic to them They have to have ways to keep themselves with water by pumping water out or pumping solutes outa

Answer 48

*out

Answer 49

what question is that

Answer 50

for

Answer 51

the 1st one you asked of why its important

Answer 52

i tried

Answer 53

i didnt sleep much last night cause i was up doing all this stupid stuff for work

Answer 54

@christiana24567

Answer 55

lol

Answer 56

k

Answer 57

yummy

Answer 58

talking about strawberries makes meh hungry

Answer 59

is that all you need ?

Answer 60

What is the slope of this line?

y = 7x + 4