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Phospholipid Molecules, Cholesterol, Carbohydrates

What are inte...

Question

What are integral and peripheral proteins?

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Solution

Integral proteins are a part of the membrane and cannot be removed without breaking membrane integrity. Peripheral proteins can be removed easily by simple procedures.

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Q. Differentiate between peripheral proteins and integral proteins.

Q. Assertion :Peripheral proteins are partially or totally buried in the membrane. Reason: Integral proteins lie on the surface of membrane.

Q. A student made a pictorial representation of eukaryotic cell membrane and labelled the components as follows:
The student has made errors while labelling the components of membrane. Which of the following hold true regarding the error?
(i) Protein A should be labelled as trans-membrane protein only and not as integral protein
(ii) The polarity of the protein A should be reversed because the cytosolic phase always shows reducing environment.
(iii) Position of cholestrol molecule should be close to polar region as it contains a polar group
(iv) Protein B should be labelled as integral membrane protein and not as peripheral glycoprotein

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