Glycolysis and fermentation
- Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :Assertion A : ATP is used at two steps in glycolysis.Reason R : First ATP is used in converting glucose into glucose-6-phosphate and second ATP is… Answer: 2. Both A and R are true and R is the correct explanation of A. Key idea: Two ATP molecules are invested in the preparatory phase of... 1
- What amount of energy is released from glucose during lactic acid fermentation ? Answer: 1. Less than 7% Lactic acid fermentation releases less than 7% of the energy in glucose. Most energy stays in the lactic acid, since... 1
- What is the net gain of ATP when each molecule of glucose is converted to two molecules of pyruvic acid ? Answer: 4. Two In glycolysis, one glucose gives two pyruvic acid molecules. 4 ATP are made and 2 ATP are used in the preparatory steps, so t... 1
- Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by : Answer: 2. Hexokinase Key idea: Hexokinase phosphorylates glucose using ATP to give glucose-6-phosphate, the first irreversible step. Phosph... 1
- What is the role of NAD^+ in cellular respiration ? Answer: 3. It functions as an electron carrier. NAD ^+ is a coenzyme that accepts electrons and hydrogen to become NADH, so it is an electro... 1