with the help of simple diffusion glucose and amino acids are absorbed then why active transport occurs ?

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Solution

Active transport requires energy for the transport of solutes in and out of the cells. For the transport of ions such as sodium and potassium ions active transport is needed. Ions are not permeable to the cell membrane so external energy is needed for the transport. This transport method is used for the movement of materials against the concentration gradient.

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Similar questions

Small amounts of monosaccharides like glucose, amino acids and some of electrolytes like chloride ions are absorbed by (i). However, some of the substances like fructose and some amino acids are absorbed by the mechanism called (ii). Various nutrients like amino acids and electrolytes like Na+ are absorbed into the blood by (iii).

a) i) facilitated transport ii) active transport iii) simple diffusion

b) i) simple diffusion ii) facilitated transport iii) active transport

c) i) active transport ii) facilitated transport iii) simple diffusion

d) i) simple diffusion ii) active transport iii) facilitated transport

Q. Value based questions.
A monoglyceride may be larger than an amino acid. Why can monoglycerides be absorbed by simple diffusion whereas amino acids cannot?

The following list indicates certain molecules/ions and their mechanism of transport across the cell membrane. Determine the correct pair(s) from the list.

I. Diffusion - $N a^{+}$

II. Active transport - Amino acids

III. Osmosis - Water

IV. Facilitated diffusion - Glucose

Q. Assertion :Glucose,

N a^{+}

and amino acids are absorbed actively. Reason:

N a^{+}

, glucose and amino acids move against the concentration gradient and hence require energy.

Q. Glucose and amino acids are absorbed in intestine by

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