(a) (i) What is the first step in the breakdown of glucose during aerobic and anaerobic respiration ? Where…
(a) (i) What is the first step in the breakdown of glucose during aerobic and anaerobic respiration ? Where does it take place ?
(ii) ATP is called the energy currency of the cell. Why ?
(iii) What is meant by "residual volume of air" in a breathing cycle ?
Solution
(a) (i) Glucose → Pyruvic acid /Pyruvate
In the cytoplasm
(ii) It is used as fuel for all activities in a cell / ATP is broken down giving rise to a fixed amount of energy which drive endothermic reactions in the cell.
(iii) When air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for the oxygen to be absorbed and for the carbon dioxide to be released / volume of air present in lung after exhalation.