A) fats
B) proteins
C) starch
D) vitamins
Correct Answer: A
Solution :
Fat is a triglyceride made of a molecule of glycerol and three molecules of fatty acid. Glycerol forms glyceraldehyde phosphate which yields 18-19 ATP molecules. Fatty acid undergo \[\beta -\]oxidation and forms acetyl Co-A, \[\text{NAD}{{\text{H}}_{\text{2}}}\]and \[\text{FAD}{{\text{H}}_{\text{2}}}\text{.}\]Acetyl Co-A enters Krebs cycle and yields 12 ATP. Therefore, fats provides more energy per gram as compared to carbohydrate. For example Palmitic acid \[({{C}_{6}}{{H}_{32}}{{O}_{2}})\] yields 8 acetyl Co-A and\[7(NAD{{H}_{2}}+FAD{{H}_{2}})\]i.e., 129 ATP.
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