D) the size of the eno 5) According to the fluid mosaic model of cell membranes,
ID: 151264 • Letter: D
Question
D) the size of the eno 5) According to the fluid mosaic model of cell membranes, phospholipids A) can move laterally along the plane of the membrane B) frequently flip-flop from one side of the membrane to the other C) occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane D) have hydrophilic tails in the interior of the membrane 6) The membranes of winter wheat are able to remain fluid when it is extremely cold by A) increasing the percentage of unsaturated phospholipids in the membrane B) increasing the percentage of cholesterol molecules in the membrane C) decreasing the number of hydrophobic proteins in the membrane D) cotransport of glucose and hydrogen 7) An animal cell lacking glycoproteins on the external surface of its plasma membrane would likely which function? A) transporting ions against an electrochemical gradient B) cell-cell recognition C) attaching the plasma membrane to the cytoskeleton D) establishing a diffusion barrier to charged moleculesExplanation / Answer
5)According to fluid mosaic model of cell membrane:-
Answer is the option (A).
Phospholipids in cellmembrane are not rigid solid structures and are like liquids.as many have unsaturated fatty acids and they don't pack together tightly And phospholipids tails can move freely inside membrane allowing free movement inside the bilayer laterlally.
Statement C is false as the phospholipids bilayer is interrupted by membrane proteins. And the membrane proteins can also be found inside of membrane like intergral proteins.
Statement D is false as hydrophobic tails are present interiorly and hydrophilic heads lie outside.
Statement B is false as phospholipids don't move in flip flop from one side of membrane to other rather than can move in the plane of the cell.
6)answer is by increasing the percentage of unsaturated phospholipids in the membrane.
In cold environment cells adapt to regulate the phases of membranre.so in extreme cold environment the phase transition of unsaturated to saturated lipid ratio should be high to maintain it in fluid mode.
7)answer is option B
Polysaccharides on the glycolipids and glycoproteins help in cell to cell recognition. So without them they are impaired in cell to cell recognition.
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