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n ncert its states that 'however some of the substance like fructose and some amino acids are absorbed with the help of carrier ions like na+ and this mechanism is called facilitated transport. but for cbse pmt 2010 the answer given was na+ facilitate the absorption of amino acid and glucose.. what is the reason for that

n ncert its states that 'however some of the substance like fructose and some amino acids are absorbed with the help of carrier ions like na+ and this mechanism is called facilitated transport. but for cbse pmt 2010 the answer given was na+ facilitate the absorption of amino acid and glucose.. what is the reason for that

Grade:12

1 Answers

Simran Vinaik
askIITians Faculty 1230 Points
6 years ago
Mistake :Fructose is absorbed with the help of the carrier ions like Na+ . (pg. 264, NCERT XI).
Corrected To: Substances are absorbed with the help of the carrier ions like Na+ .They have deleted the statement that Fructose is absorbed with the help of the carrier ions like Na+ .

Fructose transport does not occur by the sodium cotransport mechanism. It is transported by facilitated diffusion but not coupled with sodium transport.

Note:
The passage of both the glucose and thegalactose, chemically very similar, is mediated by a transporter called SGLT1, acronym ofSodium-dependentGLucose coTransporter 1, which carries out the co-transport of one molecule of glucose/galactosetogether with two sodium ions .

Fructosechemically different from glucose andgalactose, enters into the cells by facilitated diffusion, also called passive transport (no energy expenditure) thank to thetransporter GLUT5(acronym ofGLucoseTransporter type 5).

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