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Respiratory System

Which is the ...

Question

Which is the pathway for pyruvate breakdown in living organisms?

A

Pyruvate to ethanol, CO

_{2}

and energy

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B

Pyruvate to lactic acid and energy

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C

Pyruvate to CO

_{2}

, H

_{2}

O and energy

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D

All of the above

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Solution

The correct option is D All of the above
Pyruvate under aerobic conditions gets converted to CO $_{2}$ and energy. During the anaerobic condition, pyruvate gets converted to lactic acid in muscular tissues while it forms ethanol, carbon dioxide, and energy by the fermentation carried by the yeast in the absence of oxygen by using glucose as a respiratory substrate.
So, the correct answer is option D.

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Question 13
Which of the following is most appropriate for aerobic respiration?

(a) $G l u c o s e m i t o c h o n d r i a - ------- \to P y r u v a t e c y t o p l a s m - ----- \to C O_{2} + H_{2} O + E n e r g y$
(b) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e m i t o c h o n d r i a - ------- \to C O_{2} + H_{2} O + E n e r g y$
(c) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e + E n e r g y m i t o c h o n d r i a - ------- \to C O_{2} + H_{2} O$
(d) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e + E n e r g y m i t o c h o n d r i a - ------- \to C O_{2} + H_{2} O + E n e r g y$

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