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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

Q. Capability of plasma membrane to change its permeability by lateral shifting of peripheral proteins is called as

Q. Integral proteins are embedded in the phospholipid bilayer, and also called transmembrane proteins. Often times these integral proteins serve as channels through which molecules move across the cell membrane. Proteins embedded in the interior of the bilayer of the membrane are .......... and are made up of non-polar ..........

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