Fill in the blanks and choose the correct option given below.

(i) Citric acid cycle takes place in __A__ part and E.T.S in __B__ part of mitochondria.

(ii) The metabolic pathway through which the electron passes from one carrier to another is called __C__.

(iii) Complex-IV of E.T.S refers to cytochrome oxidase complex containing cytochromes __D__ and __E__ and __F__ copper centres.

(iv) ATP synthase is complex - __G__ of E.T.S.

(v) Oxidation of one molecule of NADH give rise to __H__ molecules of ATP, while that of one molecules of FADH₂ produces __I__ molecules of ATP.

(vi) __J__ acts as the final hydrogen acceptor in E.T.S.

(vii) For each ATP produced in E.T.S, __K__ passes through F₀ (part of complex V) from intermembrane space to the matrix __L__ the electrochemical gradient.

(viii) There can be a net gain of __M__ ATP molecules during aerobic respiration of one molecule of glucose.

(ix) The NADH synthesized in glycolysis is transferred into the mitochondria and undergoes __N__ phosphorylation.

(x) In fermentation there is a net gain of only __O__ molecules of ATP for each molecule of glucose degraded to pyruvic acid.

(xi) If fatty acids were used as substrate for respiration, they would first be degraded to __P__ and if glycerol, then would be converted to __Q__ and then enter the pathway.

(xii) Respiratory pathway is an __R__ pathway as it involves both catabolism and anabolism.

(xiii) The ratio of the volume of CO₂ evolved to the volume of O₂ consumed in respiration is called __S__. For carbohydrate, it is __T__ and for protein it is __U__.