Question

The name given to the accepted description of the cell membrane is the O"membrane cross-linkage" model "lipid fluid" model "fluid mosaic" model "soap bubble" model "protein interchange" model Question 31 P> <span data-keepme="true"><span>What are the numbered structures shown in diagram?</span> </span></p> <p data-keepme="true"><span>&nbsp;</span></p>

Answer 1

30.Ans:-Fluid mosaic model

An improved model of the structure of cell membrane was proposed by singer and Nicolson(1972) widely accepted as fluid mosaic model.According to this,the quasi-fluid nature of lipid enables lateral movement of proteins within the overall bilayer.This ability to move within the membrane is measured as its fluidity.

Otherslike lipid fluid ,soap bubble model are not the model in biology.so,others are incorrect except fluid mosaic model.

31.Ans :-Integrins

Integrins consists of two noncovalently associated transmembrane glycoproteins subunit alpha and beta which form transmembrane heterodimers.integrins is a transmembrane linker between the extra cellular matrix and the actin skeleton.
Phospholipids are arranged in a bilayer.the lipids are arranged within the membrane with the polar head towards the outer sides and the hydrophobic tails towards the inner part.Glycocalyx is consists of carbohydrate which function as a coat outside the both eukaryotes and prokaryotes.cholesterol is a fat like substance that our body’s every cell has which help in formation of hormones and vitamins.from the question it is clear that it’s description is about any protein structure so ,ans is integrins.