Q. No.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
Oxidative phosphorylation is
| 1. | formation of ATP by transfer of phosphate group from a substrate to ADP |
| 2. | oxidation of phosphate group in ATP |
| 3. | addition of phosphate group to ATP |
| 4. | formation of ATP by energy release from electrons removed during substrate oxidation. |
The three boxes in this diagram represent the three major biosynthetic pathways in
aerobic respiration. Arrow represent net reactants or products
Arrows numbered 4, 8, 12 can all be
1. NADH
2. ATP
3. H2O
4. FAD+ or FADH2
The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called
1. glycolysis
2. fermentation
3. aerobic respiration
4. photorespiration
Aerobic respiratory pathway is appropriately termed
1. catabolic
2. parabolic
3. amphibolic
4. anabolic
The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that Adenosine Triphosphate (ATP) is formed because
| 1. | high energy bonds are formed in mitochondrial proteins |
| 2. | ADP is pumped out of the matrix into the intermembrane space |
| 3. | a proton gradient forms across the inner membrane |
| 4. | there is a change in the permeability of the inner mitochondrial membrane toward Adenosine Diphosphate (ADP) |
Which one of the following mammalian cells is not capable of metabolising glucose to
carbon-dioxide aerobically?
1. White blood cells
2. Unstriated muscle cells
3. Liver cells
4. Red blood cells
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 overall goal of glycolysis, Krebs cycle and the electron transport system is the
formation of:
1. ATP in small stepwise units
2. ATP in one large oxidation reaction
3. Sugars
4. Nucleic acids
How many ATP molecules could maximally be generated from one molecule of glucose, if
the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the
useful chemical energy available in the high energy phosphate bond of one mole of ATP is
12 Kcal?
1. Two
2. Thirty
3. Fifty seven
4. One
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