Which statement is wrong for Krebs' cycle?
1. There are three points in the cycle where NAD+ is reduced to NADH + H+
2. There is one point in the cycle where FAD+ is reduced to FADH2
3. During conversion of succinyl Co-A to succinic acid, a molecule of GTP is synthesised
4. The cycle starts with condensation of acetyl group (acetyl Co-A) with pyruvic acid to yield citric acid
All enzymes of TCA cycle are located in the mitochondrial matrix except one which is
located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes.
This enzyme is
1. lactate dehydrogenase
2. isocitrate dehydrogenase
3. malate dehydrogenase
4. succinate dehydrogenase
The TCA cycle is considered as an aerobic pathway because
1. all enzymes of the cycle use molecular oxygen
2. some enzymes of the cycle require molecular oxygen
3. molecular oxygen is essential to reoxidise the coenzymes reduced during operation of
the cycle.
4. in absence of oxygen, the enzymes of TCA cycle are denatured.
In Krebs' cycle, GTP is formed in
1. substrate level phosphorylation
2. oxidative phosphorylation
3. non-cyclic photophosphorylation
4. cyclic photophosphorylation
Which of the following is the connecting link between glycolysis and Krebs cycle?
(1) Acetyl Co-A
(2) Oxalosuccinic acid
(3) Pyruvic acid
(4) Citric acid
The enzyme decarboxylase catalyses the following step
(1) conversion of citric acid to cis aconitic acid
(2) fumaric acid to malic acid
(3) oxalosuccinic acid to o-ketoglutaric acid
(4) malic acid to oxaloacetic acid.
Which of the following is not used for the cyclic process of cellular respiration of carbohydrates?
1. Krebs’ cycle
2. Tricarboxylic Acid Cycle
3. Citric Acid cycle
4. Phosphorespiration cycle
The very first step of TCA cycle involves except
(1) Citrate synthase
(2) A molecule of coenzyme A is released
(3) Isomerization
(4) Formation of citrate
From citrate to alpha-ketoglutarate in TCA cycle all the following reactions happen except
(1) Isomerization
(2) Decarboxylation
(3) Release of Carbon-dioxide
(4) FADH2 formation
From alpha-ketoglutarate to succinyl CoA in TCA cycle which of the following occurs
(1) 4C compound is formed
(2) 5C compound is Formed
(3) 6C compound is formed
(4) 2C compound is regenerated