THE CELL
TRANSPORT INTO AND OUT OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Because the molecules involved have high kinetic energy
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Because the molecules involved are charged
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Because the molecules involved already have ATP
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Because the molecules involved have low, to no kinetic energy
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Detailed explanation-1: -Because it is the passive flow of substances such as glucose and amino acids across the cell membrane, it does not require ATP. Ans. Diffusion is aided as it moves down the concentration gradient. Active transport occurs in the direction of the concentration gradient.
Detailed explanation-2: -Facilitated diffusion doesn’t require ATP because it is the passive movement of molecules such as glucose and amino acid across the cell membrane. It does so with the aid of a membrane protein since the glucose is a very big molecule. Examples of membrane proteins include channel proteins and carrier proteins.
Detailed explanation-3: -Diffusing molecules should have kinetic energy with which they are always in random motion. Without kinetic energy, the molecules will never move from one place to another. That’s why at absolute zero where molecules lose all their kinetic energy net movement is zero. At absolute zero diffusion doesn’t occur.
Detailed explanation-4: -Simple diffusion does not require energy: facilitated diffusion requires a source of ATP. B. Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient.
Detailed explanation-5: -Explanation: No they do not require ATP. This transport occurs due to the concentration gradient. If there is high concentration of a molecule in a region then it transports to the region where there is low concentration of it down the concentration gradient.