Cytochromes are found in

• matrix of mitochondria

• outer wall of mitochondria

• cristae of mitochondria

• cristae of mitochondria

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

• fermentation

• photorespiration

• aerobic respiration

• aerobic respiration

A competitive inhibitor of succinic dehydrogenase is 

• malonate

• oxaloacetate

• alpha-ketoglutarate

• alpha-ketoglutarate

The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes  that Adenosine Triphosphate (ATP) is formed because

• High energy bonds are formed in mitochondrial proteins

• ADP is pumped out of the matrix into the intermembrane space

• a proton gradient forms across the inner membrane

• a proton gradient forms across the inner membrane

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

• Sugars

Which of the following statements regarding mitochondrial membrane is not correct?

• The outer membrane is permeable to all kinds of molecules

• The enzymes of the electron transfer chain are embedded in the outer membrane

• The inner membrane is highly convoluted forming a series of infoldings

• The inner membrane is highly convoluted forming a series of infoldings

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

• Fifty seven

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

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

9.

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

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

In gymnosperms, the Ovule is naked because

• Ovary wall is absent

• Integuments are absent

• Perianth is absen

• Nucellus is absent