A) phospholipids embedded in a protein bilayer
B) proteins embedded in a phospholipid bilayer
C) proteins embedded in a polymer of glucose molecules
D) proteins embedded in a .carbohydrate bilayer
Correct Answer: B
Solution :
According to fluid mosaic model given by Singer and Nicholson (1972), plasma membrane consists of a continuous bilayer of phospholipid molecules, in which globular proteins are embedded. This arrangement corresponds to icebergs (proteins) floating in a sea of phospholipids. Proteins stay in the membrane because they have region's of hydrophobic amino acids which interact with fatty acid tails to exclude water. Rest of the molecule is hydrophilic, which faces into or outward, both of which are aqueous environment.
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