Respiration in Plants

Which of the following is the key compound in the intermediary metabolism of carbohydrates, lipid and proteins

• PEP

• PGA

• Acetyl CoA

•  $\alpha$  -ketoglutarate
  

How many oxidation, decarboxylation and substrate level phosphorylation occurs respectively during complete oxidation of two pyruvate molecule :–

• 3, 5, 1

• 6, 10, 2

• 10, 6, 2

• 5, 3, 1

First respiratory substrate :

• Lipid

• Protein

• Carbohydrate

• Both (a) and (c)

Pyruvate which is formed by the glycolytic catabolism of carbohydrates in the cytosol, after it enters into mitochondrial matrix it undergoes :

• Reductive amination

• Oxidation decarboxylation

• Reductive carboxylation

• Reductive decarboxylation

How many oxidation step take place during glycolysis, link reaction and Kreb’s cycle.

• 1, 1 and 1

• 1, 1 and 4

• 1, 1 and 3

• 1, 1 and 8

What is the role of NAD⁺ in cellular respiration?

• It is a nucleotide source for ATP synthesis.

• It functions as an electron carrier.

• It functions as an enzyme

• It is the final electron acceptor for anaerobic respiration.

Which of these statements is incorrect?

• Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms

• Glycolysis occurs in cytosol

• Enzymes of TCA cycle are present in mitochondrial matrix

• Oxidative phosphorylation takes place in outer mitochondrial membrane

Which is required in glycolysis

• ATP, ADP, NAD⁺, Glucose, cytoplasmic enzymes

• FAD⁺, ADP, ATP, Glucose, cytoplasmic enzymes

• NADP⁺, ATP, GTP, Glucose, cytoplasmic enzymes

• NAD⁺, NADP⁺, ATP, Glucose, cytoplasmic enzymes

How many ATP molecules are formed from three molecules of acetyl CoA in Krebs cycle excluding electron transport chain?

• 5

• 3

• 6

• 33

When a molecule of pyruvic acid is subjected to fermentation and forms lactic acid, there is

• Gain of 2 ATP

• Loss of 3 ATP

• Loss of 6 ATP

• Gain of 3 ATP