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Question

Carrier ions like Na+ facilitate the absorption of substances like?


A

Fructose and some amino acids

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B

Glucose and fatty acids

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C

Fatty acids and glycerol

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D

Amino acids and glucose

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Solution

The correct option is D

Amino acids and glucose


The correct option is D

Explanation of the correct option:

  1. The digestion of starch by salivary amylase and pancreatic amylase results in maltose and glucose.
  2. Glucose further breaks down and is then coupled with Na+ and then transported by sodium-glucose co-transporter.
  3. Proteins are broken down into peptide fragments and peptide fragments are further broken down into amino acids. Amino acids enter by secondary active transport coupled to Na+.
  4. Fructose is transported by facilitated diffusion via glucose transporter and fatty acids by diffusion.

Final answer: Carrier ions like Na+ facilitate the absorption of substances like amino acids and glucose.


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