Question

Select the INCORRECT statements from the following

1. In plasma membrane hydrophilic polar heads of lipids arrange towards the outer side and the hydrophobic tail towards the inner side
2. In plasma membrane peripheral proteins lie on the surface of membrane while the integrated proteins are buried in the membrane
3. Neutral solutes may move across the membrane by the process of simple diffusion against the concentration gradient
4. Polar molecules can pass through the non-polar lipid bilayer and do not require a carrier protein

The correct answer is

Options

• I, II

• III, IV 

• II, III

• I, III

Answer 1

III, IV 

Explanation:

Simple diffusion along the gradient of concentration is how neutral solutes cross the membrane. Polar molecules need a carrier protein to enable their transport because they cannot pass through the non-polar lipid bilayer on their own.