Now I get it thanks a lot , JAZAK ILALLAH 5AYRAN
You got the 2000th post
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Now I get it thanks a lot , JAZAK ILALLAH 5AYRAN
oh i get it...thankyou very muchA primary structure of a protein is held by peptide bonds only. So there are no hydrostatic forces of attraction at all. This makes option A wrong.
There are no ionic bonds in a secondary structure, only hydrogen bonds (responsible for the alpha-helix and beta-plated sheet). This makes option B wrong.
Everything is correct with option C.
There are definitely hydrogen bonds holding a quaternary structure together. There are also no peptide bonds linking two different polypeptide chains.
One more point I'd like to clarify, When I say that a quaternary structure doesn't have any peptide bonds, I don't mean that there are no peptide bonds at all. All I'm saying is that it's not responsible for forming and maintaining a quaternary structure.
hehehe , you mean that I put a lot of posts? may be , I guess I have a lot of doubts and my p1 is 4 days ahead , so I should be fully prepared ..but mashallah you're excellent in bioYou got the 2000th post
The answer is A. How is it D?
Diffusion evens out the concentrations; it tries to attain equilibrium. For example, if solution A is 1M sucrose, and solution B is 3M sucrose, when the particles diffuse, both solutions would be of 2M sucrose.
Active transport does the opposite: it tries to widen the concentration gradient. For example, if solution A is 1M sucrose, and solution B is 3M sucrose, when a pump is placed, solution A would be 0.5M sucrose, and solution B would be 3.5M sucrose after a while.
Active transport makes something concentrated even more concentrated. Inside the cell, there is a high concentration of potassium. Active transport tries to make it even more concentrated, so it transports potassium inside the cell (that is, process number 2).
The same holds true for the other three processes.
EDIT: Your problem may be that you didn't differentiate between the outside and inside parts of the cell. From the diagram, you can clearly see that the inside of the cell is up and the outside of the cell is down. So processes 1 and 2 point towards the inside of the cell and processes 3 and 4 point towards the outside of the cell.
is bulk transport an active process?
Active transport is when molecules that are small, but not lipid soluble go through the carrier proteins in the cell membrane.
Bulk transport is when the membrane surrounds large molecules to big to go through the lipid bilayer, to form a vesicle inside which then travels through the cytoplasm.
It's active transport and therefore needs energy.
Sorry for the wrong answer first
s03 may/june P1 q20,22,23,30
Thankyou
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s08_qp_1.pdf
can anyone tell me what's Y in qns 17?
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s08_qp_1.pdf
can anyone tell me what's Y in qns 17?
Why is denitrification increased in soils with little oxygen?
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