Question

Plasma membranes are best described as a
1.double layer of phospholipids with hydrophobic tails directed toward the cytoplasm of the cell.
2.single layer of phospholipids with water molecules attached along one side.
3.double layer of phospholipids with hydrophilic heads directed toward one another.
4.double layer of phospholipids with hydrophobic tails oriented toward one another.
5. single layer of phospholipids with tails pointed toward the inside of the cell.

Answer 1

​​​​​​Option 4

Plasma membrane is a double layer. So, option 2 and 5 are incorrect.

1st option is incorrect because hydrophobic tails form the hydrophobic core of the membrane. They neither interact with the external aqeuous environment of the cell nor they interact with the cytoplasm of the cell. They are oriented towards one another to form the core of the membrane.

3rd option in incorrect because hydrophilic heads are not oriented towards one another in the membrane. They are present towards external environment of the cell.

FLUID MOSAIC MODEL OF PLASMA MEMBRANE (Singer and Nicolson) integral carbohydrate membrane protein cholesterol hydrophilic phosphate head glycoprotein oboko STARR AM ille q hydrophobic fatty acid tails glycolipid extrinsic membrane protein

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