Answer
the correct option is (C).
Work Step by Step
a. A molecule that has carboxylic group (COO-) and an amino group (NH3+) in its structure is called an amino acid. The nature has nearly 300 types of amino acids and among them only 20 amino acids are used for the synthesis of proteins. Examples of amino acids are Glycine (G), Histidine (H), etc. Thus, the option (a) is incorrect.
b. ATP (adenosine triphosphate) is a nucleotide; it contains ribose sugar, adenine base and three phosphate groups. It does not have a helical structure. However, the polymeric form of ATP and other three nucleotides, namely GTP, TTP and CTP form nucleic acids called DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), which are present in helical structure. Thus, the option (b) is incorrect.
d. ATP is a component of coenzymes NAD+ (nicotinamide adenine dinucleotide), FAD (Flavin adenine dinucleotide), and CoA (coenzyme-A), but not the component of nucleic acids like DNA and RNA. It exists in the AMP form in DNA and RNA. Comment Step 4 of 5 Thus, the option (d) is incorrect.
c. ATP is a high energy molecule, and it stores chemical energy in the form anhydrous phosphate bonds. The last two phosphate bonds of ATP are unstable, so they tend to break down and release energy. Breakdown of a single anhydrous bond release -30.5 kJ/mol of energy. Thus, the correct option is (C).
