Question

Pick out the wrong statement
(correct answer + 1, wrong answer - 0.25)

• A. Amino acid is a substituted methane.
• B. Glycerol is a trihydroxypropane.
• C. Lysine is a neutral amino acid.
• D. Lecithin is a phospholipid

Answer 1

The correct option is C Lysine is a neutral amino acid.

Amino acids are substituted methanes as they contain four substituent groups, hydrogen, carboxyl group, amino group and a variable group (R) attached to a central carbon atom.

Based on number of amino and carboxyl groups, these are acidic (e.g., glutamic acid) and, basic (e.g., lysine) neutral (e.g., valine amino acids).

Glycerol is an alcoholic compound having three hydroxy groups substituted in propane. Hence, it is a trihydroxypropane.

Lecitin is also called phosphatidyl choline. It belongs to a class of lipids called phospholipids containing hydrophilic head having a phosphate group and two hydrophobic tails derived from fatty acids, joined together by an alcohol residue.