Question

Select the correct option:

What does A,B and C depict in the given pathways of anaerobic respiration?

• A. A-$NADH+H^{+}\to NA{D}^{+}$; B- $NA{D}^{+}\to NADH+H^{+}$; C-$NA{D}^{+}\to NADH+H^{+}$
• B. A-$NADH+H^{+}\to NA{D}^{+}$; B-$NADH+H^{+}\to NA{D}^{+}$; C-$NA{D}^{+}\to NADH+H^{+}$
• C. A-$NA{D}^{+}\to NADH+H^{+}$; B-$NADH+H^{+}\to NA{D}^{+}$; C- $NADH+H^{+}\to NA{D}^{+}$
• D. A-$NA{D}^{+}\to +H^{+}$; B-$NADH+H^{+}\to NA{D}^{+}$; C- $NA{D}^{+}\to NADH+H^{+}$

Answer 1

The correct option is C A-$NA{D}^{+}\to NADH+H^{+}$; B-$NADH+H^{+}\to NA{D}^{+}$; C- $NADH+H^{+}\to NA{D}^{+}$

In glycolysis, NAD+ oxidises glyceraldehyde-3-phosphate by acting as a reducing agent and convert it to 3-phosphoglyceric acid.

($NA{D}^{+}+H^{+}$ $\to NADH$)

In the absence of oxygen Pyruvic acid to either Lactic acid or ethanol depending on the organism.

1. In Lactic acid fermentation - pyruvic acid converts into Lactate while regenerating the $NAD+$.

($NADH\to NA{D}^{+}+H^{+}$)

2. In Alcoholic fermentation - pyruvic acid converts into ethanol while regenerating the $NA{D}^{+}$.

($NADH\to NA{D}^{+}+H^{+}$)

So, the correct answer is (C).