Question

Analyse the following flow chart and identify A, B and C.
$\mathrm{Proteins}\to A\to C\mathrm{Lipids}\to B\to CC\to \mathrm{Kreb}\text{'}s\mathrm{Cycle}\to {\mathrm{CO}}_2+H_{2}O+\mathrm{Energy}$

• A. A - Amino acid, B - Glucose, C - Fatty acid
• B. A - Fatty acid, B - Amino acid, C - Acetyl-CoA
• C. A - Amino acid, B - Fatty acid, C - Acetyl-CoA
• D. A - Amino acid, B - Fatty acid, C - Pyruvate

Answer 1

The correct option is C A - Amino acid, B - Fatty acid, C - Acetyl-CoA

During glycolysis, glucose is converted to pyruvic acid. Pyruvic acid is then converted to acetyl-CoA and it enters Kreb's cycle to produce energy. When there is unavailability of glucose, proteins and lipds are used to produce energy.
In the given flow chart - Proteins are converted into amino acids (A). Lipids are converted into fatty acids (B). Fatty acids and amino acids both of them are converted into acetyl-coA (C). The acetyl-co-A (C) now enters the Kreb's cycle to produce carbon dioxide, water and energy.