Which of the following statements are true? a. All membrane proteins are bound to the interior...
Which of the following statements are true?
a. All membrane proteins are bound to the interior of the membrane.
b. Both proteins and lipids undergo transverse diffusion from the inner to outer leaflets.
c. Some proteins and lipids undergo lateral diffusion along the surface of the membrane.
d. Carbohydrates are found covalently attached to molecules on the outside of the membrane.
e. The term 'mosaic' describes a highly-ordered region of the membrane rich in cholesterol and sphingolipids.
Homework Answers
Which of the following statements are true?
a. All membrane proteins are bound to the interior of the membrane.-No there are extrinsic proteins also.
b. Both proteins and lipids undergo transverse diffusion from the inner to outer leaflets. Yes, this is true. It is possible due to the flip-flop of channel proteins.
c. Some proteins and lipids undergo lateral diffusion along the surface of the membrane. This is correct as they can diffuse laterally in the membrane.
d. Carbohydrates are found covalently attached to molecules on the outside of the membrane. Yes they are linked covalently to the proteins.
e. The term 'mosaic' describes a highly-ordered region of the membrane rich in cholesterol and sphingolipids.- Mosaic is not highly ordered arrangement. It is present in scattered form.
So, the correct answer is b,c and d.
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