Question

1. Carbohydrates are the only class of molecules that are capable of activating the G protein-coupled receptors that transduce the sense of sweet taste.

   True

   False

Answer 1

This statement is false

Explanation:

Firstly, sugar molecule bind to a receptor cell then it initiates a signal transduction pathway by activating the G protein-coupled receptor.

Carbohydrates, some amino acids and some alcohol can be a sweet receptors.

Sweet, bitter and umami receptors belongs to G protein-coupled receptors (GPCRs).

Carbohydrates such as monosaccharides, disaccharisdes, trisaccharides, tetrasaccharides elicit sweet taste. Some amino acids also activate sweet taste such as glycine, alanine, threonine, D-tryptophan, D-histidine and others also. Some alcohols, such as glycerol, sorbitol are sweets too.