Which of the following is not correct for monosac-charides ?

Options

A. All are simplest sugars, each containing 3 to 9 `C` atoms, all but one of which bear a hydroxyl group. The remaining `C` atom is part of a carbonyl group.
B. Monosaccharides exist `D-` and `L-` isomers.
C. Monosaccharides are highly soluble in water
D. Only a few of the many monosaccharides are of major biological importance. All are `D-` sugars, and most are 5- or 6- `C` sugars.

Answer

A

Explanation

Their general formula is `C_(n) H_(2n) O_(n)`, where `n` is 2-10
(2) Because each molecule has at least one `C` atom with four different groups attached
(3) Because of their polar structure
(4) D- Glucose-fructose, D-ribose, and 2- deoxy-D-ribose are by far the most important sugars.
D-glucose is common blood. sugar, an important energy source for cell function. D-fructose is the common in fruits (such as grapes) and a food source. D-ribose and 2-dioxy-D-ribose are parts of nucleic acids.