HUMAN NUTRITION

NUTRITION

LIPIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When does a concentration gradient exist?
A
When membranes repture
B
When solute concentrations are high
C
When solute concentrations are low
D
When solute concentrations differ on two sides of a membrane
Explanation: 

Detailed explanation-1: -A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.

Detailed explanation-2: -The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse. The direction of diffusion is said to be ‘down’ or ‘with’ the concentration gradient.

Detailed explanation-3: -Final answer: When the concentration of water and solutes on either side of the cell membrane is same, the solution is said to be isotonic.

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