Biology : Respiration in Plants

The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products

Arrows numbered 4, 8 and 12 can all be 

• NADH

• ATP

• H₂O

• FAD⁺ or FADH₂

Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

• Glucose-6-phosphate

• Fructose 1, 6-bisphosphate

• Pyruvic acid

• Acetyl Co-A

How many ATP are produced when one molecule of FADH₂ is oxidised to FAD through electron transport system?

• 2

• 3

• 1

• 4

Out of 38 molecules of ATP produced upon aerobic respiration of glucose, the break up if ATP production in glycolysis (P), pyruvate to acetyl Co- A formation (Q) and Krebs' cycle (R) is as follows

• P= 2, Q= 6, R= 30

• P= 8, Q= 6,R= 24

• P= 8, Q= 10, R= 2

• P= 2, Q= 12, R= 24

TCA cycle enzymes are located in

• cristae

• outer membrane

• mitochondrial matrix

• mitochondrial intermembrane space

With reference to Glycolysis, which of the following statement is not correct?

• Glycolysis consumes 2 ATP molecules for the initial phosphorylation of substrate molecule.

• Oxygen is not required for glycolysis

• Net gains is one molecule of NADH and three molecules of ATP for every molecule of glucose broken down.

• It is a linear pathway and occur inside the cytoplasm.

Statement I:- $\mathrm{\alpha }$-ketoglutarate dehydrogenase catalyses the conversion of oxalosuccinic acid to $\mathrm{\alpha }$-ketoglutarate.

Statement II:- This reaction is accompained with release of CO₂.

Choose the correct option.

• Statement I is correct and statement II is incorrect

• Statement II is correct and statement I is incorrect

• Both statements correct

• Both statements incorrect

Match the following electron transport chain (ETC) inhibitors with their mode of action.

Column I	Column II
A. Dinitrophenol (2,4- DNP)	1. Electron flow from cyt a3 to O2
B. Cyanide	2. Direct electrons from Co-Q to O2
C. Antimycin-A	3. Electron flow from NADH/FADH2 to Co- Q
D. Rotenone	4. Electron flow from Cyt- b to Cyt- c

• A - 2; B - 4; C - 1; D - 3

• A - 2; B - 1; C - 4; D - 3

• A - 3; B - 4; C - 1; D - 2

• A - 1; B - 2; C - 3; D - 4

In complete oxidation of glucose, ATP molecules are formed from ADP. Which among the following stage yields the maximum amount of ATP?

• Glycolsis

• Kreb's cycle

• Electron transport chain

• Conversion of pyruvic acid to acetyl Co-A

Glycolysis is

• C₆H₁₂O₆ + 6O₂ $\to$ 6O₂ + 6H₂O

• C₆H₁₂O₆ $\to$ 2C₂H₅OH + 2CO₂

• C₆H₁₂O₆ $\to$2C₃H₄O₃ + 2CO₂

• C₃H₄O₃ + NADH $\to$C₂H₅OH + CO₂ + NAD⁺