The energy -releasing process in which the substrate is oxidised without an external electron acceptor called

  • fermentation

  • photorespiration

  • aerobic respiration

  • glycolysis

Which one of the following statements is incorrect?

  • The residual air in lungs slightly decreases the efficiency of respiration in mammals

  • The presence of non-respiratory air sacs, increases the efficiency of respiration in birds

  • In insects, circulating body fluids serve to distribute oxygen to tissues

  • The principle of countercurrent flow facilitates efficient respiration in gills of fishes

Which statement is wrong for Krebs' cycle?

  • There are three points in the cycle where NAD+ is reduced to NADH + H+

  • There is one point in the cycle where FAD+ is reduced to FADH2

  • During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised

  • The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid

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?

  • Two

  • Thirty

  • Fifty seven

  • One

The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of

  • ATP in small stepwise units

  • ATP in one large oxidation reaction

  • Sugars

  • Nucleic acids

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