Which does not pertain to facilitated transport?
The main significance of facilitated diffusion is:
So the correct option is 'Absorption of fructose and nucleotides in the small intestine'.
Absorption of diffusible ions by cells against the concentration gradient is called:
Active absorption is the only absorption method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration gradient from high to low concentration.
Consider the following statements about facilitated transport:
(I) Requires ATP energy
(II) Transport saturates
(III) Highly selective
(IV) Requires special membrane properties
(V) Uphill transport
Of the above statements:
Transport systems that use carrier molecules but which do not require energy to proceed are called facilitated diffusion.
Hence, the correct answer is option E: (II), (III) and (IV) are relevant, but (I) and (V) are irrelevant.
Which of the following statements are true/false?
(I) The positive hydrostatic pressure is called turgor pressure.
(II) Wall pressure is exerted to prevent the increase of protoplasm size.
(III) Diffusion is more rapid in liquids than in gases.
(IV) Diffusion of water through a semi-permeable membrane is called imbibition.
(V) Osmosis is the movement of substances that occurs along a diffusion gradient.