LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the absorption of mineral salts by root hair cells
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the absorption of water by root hair cells
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the absorption of glucose and amino acids by the small intestine
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the absorption of oxygen by the leaves
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Detailed explanation-1: -Active transport of glucose mediated by SGLT1 in the apical membrane of enterocytes appears as the main molecular mechanism of glucose absorption in the small intestine. This mechanism determines the rate of glucose entry into the bloodstream under both low and high carbohydrate load in the gut.
Detailed explanation-2: -Active transport occurs against the concentration gradient and hence requires energy. Various nutrients like amino acids, monosacharides like glucose, electrolytes like Na+ are absorbed into the blood by this mechanism.
Detailed explanation-3: -So, the correct answer is ‘Facilitated diffusion and Active transport respectively’.
Detailed explanation-4: -Active transport mechanisms, primarily in the duodenum and jejunum, absorb most proteins as their breakdown products, amino acids. Almost all (95 to 98 percent) protein is digested and absorbed in the small intestine. The type of carrier that transports an amino acid varies.
Detailed explanation-5: -The small intestine is the primary site of amino acid and glucose absorption into the blood. These solutes are transported by three processes: simple diffusion, facilitated diffusion, and “active” transport.