0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
If a substance is able to diffuse across a membrane then the membrane is said to be what?
selectively permeable
What characteristics is more likely to make a substance diffuse through the cell membrane?
Size. Actually very few substances are able to diffuse across the menbrane, most must be transported ie facilitated diffusion, active transport, or receptor-mediated endocytosis. Carbon dioxide, oxygen, water, and some lipid substances are able to diffuse across the membrane
How does a visking tubing differ from a cellmembrane?
Visking tubing contains millions of tiny holes which only let small molecules, like water, diffuse through. Large molecules, such as starch, cannot cross the membrane. We say it is partially permeable (permeable means a substance is able to pass through). This is similar to a cell membrane. Visking tubing can therefore be used as a model of a cell.
How does lipid solubility affect the ability of substances entering a cell?
If the substance is not lipid soluble, it will not be able to pass through the cell membrane, which is a phospholipid bilayer. This means it will not be able to enter the cell.
What is ferroelectric substance?
A substance which contains iron(Fe) and is able to conduct electricity.
What is the membrane said to be if a substance is able to diffuse across a membrane?
selectively permeable
If a substance is able to diffuse across a membrane then the membrane is said to be what?
selectively permeable
What characteristics is more likely to make a substance diffuse through the cell membrane?
Size. Actually very few substances are able to diffuse across the menbrane, most must be transported ie facilitated diffusion, active transport, or receptor-mediated endocytosis. Carbon dioxide, oxygen, water, and some lipid substances are able to diffuse across the membrane
What particles can diffuse directly through the lipid bi-layer?
As the bilayer contains hydrophobic fatty acid tails, water-soluble molecules cannot diffuse directly through. However, lipid soluble molecules such as oxygen can diffuse directly through. Overall, for a molecule to be able to diffuse directly through it must be lipid-soluble, relatively small and non-polar.
Why aren't protons able to diffuse through the inner mitochondrial membrane?
Its going against their gradient
Steroid hormones don't need binding receptors why?
Steroid hormones are lipids so are able to diffuse through the membrane without receptors.
Why do certain smells spread through the air faster than others?
Well, it depends on the heat of the air and how much air there is. Smells spread though the air during the process of diffusion, which happens faster if the air is hotter(the particles of the air will move faster if hotter and therefore the substance will diffuse quicker). Also they will spread faster if there is more air, which means more particles being able to diffuse the substance. I hope that this helps. As you can see, I an an a* student in chemistry! Please feel free to correct and extend if needed.
Are solutes always able to diffuse through a cell's selective permeable membrane?
No, cell membranes are semi-permeable, meaning they allow some solutes to pass through - but not others.
What molecules would easily be able to diffuse through a cell membrane without the help of a transport protein?
Water, any small molecule and lipids.
Is water always able to diffuse through a cells selective permeable membrane?
Yes, due to its very small molecular size - unless of course it is frozen.
What molecule is able to easily diffuse across the cell's membrane?
Carbon dioxide, oxygen and some nonpolar molecules diffuse easily.
How do you fuse cellophane to wire for making fairy wings?
Try the web site Faerie Muse. There are instructions on how to make cellophane faerie wings. You may find your answer here. Or, type in where to buy cellophane wings and search. I was able to find a couple of web sites that explained how to make cellophane wings. Also, on youtube there is a gal making these type of wings and she has I think 6 different parts....because it took her a few tries to figure out how to get cellophane to adhere. Hope this helps. B
