Table of Contents
- 1 What is the cost in ATP equivalents of transforming glucose to pyruvate?
- 2 What is the cost of glycolysis?
- 3 What is the cost in terms of energy to convert lactate into pyruvate?
- 4 What is the net gain of ATP during the conversion of glucose to pyruvate Mcq?
- 5 Which enzyme requires ATP as a substrate?
- 6 How many would be the net gain of ATP during the glycolytic pathway when there is a breakdown of one molecule of glycogen to pyruvic acid?
- 7 What is the net ATP produced by glycolysis and gluconeogenesis?
- 8 How does the body take up glucose from the blood?
What is the cost in ATP equivalents of transforming glucose to pyruvate?
Formation of no more than two ATP molecules makes it exergonic to turn glucose into pyruvate, whereas expenditure of six ATP equivalents makes it exergonic to turn pyruvate back into glucose.
What is the cost in ATP of transforming glucose to pyruvate via glycolysis and back again to glucose via gluconeogenesis?
What is the cost in ATP of transforming glucose to pyruvate via glycolysis and back again to glucose via gluconeogenesis? The cost of transforming glucose to pyruvate and back to glucose is given by the difference of the two equations. The energy cost is four ATP equivalents per glucose molecule.
What is the cost of glycolysis?
So far, glycolysis has cost the cell two ATP molecules and produced two small, three-carbon sugar molecules.
How many ATPs are formed as glucose is metabolized to pyruvate in glycolysis?
2 ATP
During glycolysis, glucose ultimately breaks down into pyruvate and energy; a total of 2 ATP is derived in the process (Glucose + 2 NAD+ + 2 ADP + 2 Pi –> 2 Pyruvate + 2 NADH + 2 H+ + 2 ATP + 2 H2O). The hydroxyl groups allow for phosphorylation. The specific form of glucose used in glycolysis is glucose 6-phosphate.
What is the cost in terms of energy to convert lactate into pyruvate?
Lactate is converted to pyruvate by the enzyme lactate dehydrogenase. The standard free energy change of the reaction is -25.1 kJ/mol.
Which of the following metabolic conversions involved in glucose synthesis requires the direct expenditure of ATP?
3.5 CURRENT STATUS OF FOOD ENERGY CONVERSION FACTORS
| Protein kcal/g (kJ/g)§ | Fat kcal/g (kJ/g)§ | |
|---|---|---|
| Fats – separated: | ||
| Butter | 4.27 (17.9) | 8.79 (36.8) |
| Margarine, vegetable | 4.27 (17.9) | 8.84 (37.0) |
| Other vegetable fats and oils | — | 8.84 (37.0) |
What is the net gain of ATP during the conversion of glucose to pyruvate Mcq?
14. What is the net gain of ATP during the conversion of glucose to pyruvate? Answer: (a) 2 ATP.
How many ATP are produced in mitochondria on complete oxidation of glucose?
In the mitochondria, the metabolism of sugars is completed, and the energy released is harnessed so efficiently that about 30 molecules of ATP are produced for each molecule of glucose oxidized.
Which enzyme requires ATP as a substrate?
The two initial phosphorylations by hexokinase and PFK require ATP and are therefore irreversible. PFK is one of the key regulators in glycolysis. It is activated by fructose-2,6-bisphosphate and AMP and inhibited by increased formation of citrate and ATP during oxidative substrate phosphorylation in the CAC.
Which of the following metabolic conversion does not occur in gluconeogenesis?
Gluconeogenesis does not include the conversion of fructose or galactose into glucose in the liver or the generation of glucose from glycogen via glycogenolysis. The pathway of gluconeogenesis (Figure 1) occurs mainly in the liver and kidney cortex and to a lesser extent in the small intestine.
How many would be the net gain of ATP during the glycolytic pathway when there is a breakdown of one molecule of glycogen to pyruvic acid?
Through glycolysis, the Krebs Cycle and the redox reactions in the Electron Transport Chain, the total energy yield from the oxidation of 1 molecule of glucose would be ____ molecules of ATP.
What is the energy cost of transforming glucose to pyruvate and back?
The cost of transforming glucose to pyruvate and back to glucose is given by the difference of the two equations. The energy cost is four ATP equivalents per glucose molecule. , Biochemistry Professor (Emeritus in 2020) at Uniformed Services University of the Health Sciences (1979-pres…
What is the net ATP produced by glycolysis and gluconeogenesis?
Alanine goes to the liver where is transaminated back to pyruvate. Pyruvate goes to glucose via gluconeogenesis and then back to the blood. As shown, glycolysis produces 2 ATP whereas gluconeogensis uses 6 ATP, so the net ATP is 4. However, for the cycle to function physiologically one should include the cost of producing urea.
What is the net cost of glycolysis and gluconeogenesis?
Glycolysis yields 2 ATP molecules (for the red blood cell) and gluconeogenesis costs (the hepatic cell) 6 ATP molecules. So, the net cost is 4 ATP molecules. 8 clever moves when you have $1,000 in the bank.
How does the body take up glucose from the blood?
Then, the liver and the brain can take up glucose from the blood regardless of insulin level, but muscle and adipose take up glucose only when insulin levels are elevated in response to high glucose. Suppose you discovered a mutant yeast whose glycolytic pathway was shorter because of the presence of a new enzyme catalyzing the reaction.