Assertion (A) :- The pathway from glucose to lactic acid occurs in $10$ metabolic steps. Organisms will trap this energy and store in the form of chemical molecules.

Reason (R) :- Glucose is the only substrate for the production of energy.

The correct option among the following is:

Arrange the following in the order of their occurrence in the glycolytic pathway.

I. Triose bisphosphate $⟶$ Triose phosphate

II. Fructose-$6$-phosphate $\to$ Fructose $1,6$-bisphosphate

III. Phosphoenolpyruvate $\to$ Pyruvic acid

IV. $2$-Phosphoglycerate $⟶$ Phosphoenolpyruvate

V. Glucose-$6$-phosphate $⟶$ Fructose-$6$-phosphate

VI. Triose phosphate $⟶$ $2$-Phosphoglycerate

The correct sequence is:

Identify the reactions where energy is produced:

I. $\mathrm{Malic} \mathrm{acid}+{\mathrm{NAD}}^{+} \stackrel{\mathrm{Malate}dehydrogenase}{⟶} \mathrm{oxaloacetic} \mathrm{acid}+\mathrm{NADH}$

II. $\mathrm{Citric} \mathrm{acid} \stackrel{\mathrm{Aconitase}}{⟶} \mathrm{cis}-\mathrm{aconitic} \mathrm{acid}+{\mathrm{H}}_2\mathrm{O}$

III. $\mathrm{Succinic} \mathrm{acid}+\mathrm{FAD} \stackrel{ \mathrm{Succinic} \mathrm{dehydrogenase} }{⟶} \mathrm{Fumaric} \mathrm{acid}+{\mathrm{FADH}}_2$

IV.  $\mathrm{Succinyl} \mathrm{CoA}+\mathrm{ADP}+\mathrm{Pi} \underset{\mathrm{Thiokinase}}{\overset{\mathrm{Succinic}}{\to }} \mathrm{Succinic} \mathrm{acid}+\mathrm{ATP}+\mathrm{CoA}$

V. $\mathrm{Oxalosuccinic} acid\underset{ \mathrm{decarboxylase}}{\overset{\mathrm{Oxalosuccinic} }{\to }} \mathrm{\alpha }-\mathrm{Ketoglutaric} \mathrm{acid}+{\mathrm{CO}}_2$

The correct combination is:

Assertion (A): When electrons move through the transport chain, protons are transported across the membrane.

Reason (R) : Because the primary acceptor of electron located towards the outside of the membrane, transfers its electrons to a H carrier (PQ). 

The correct option among the following is: