Multiple choice

Cell membranes are dynamic structures constituted of various biochemical entities. Many models have been proposed for defining the structure and constitution of membranes. The most accepted of these is the Singer and Nicholsons’ fluid mosaic model. Based on the knowledge of Singer and Nicholsons’ model, answer the following:

Which of the following statements justifies the correct biochemistry profile of the plasma membrane with respect to individual constituents?

  1. Lipids are in the least proportion, while carbohydrates and proteins are slightly higher but in equal proportions.

  2. Proteins are in the least proportion, while carbohydrates are slightly higher and lipids are the most abundant of all.

  3. All the three are in equal proportions.

  4. Carbohydrates are in the least proportion, while proteins are slightly higher and lipids are the most abundant of all.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fluid mosaic model proposed that plasma membrane comprises of a phospholipid bilayer with extrinsic and intrinsic proteins embedded into it along with protein channels. Apart from these, glycolipids and glycoproteins, though present minutely, form the antennae-like structures to assist in recognition and identification.  

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