Cytochromes are found in

• matrix of mitochondria

• outer wall of mitochondria

• cristae of mitochondria

• cristae of mitochondria

Which one of the following statements in incorrect?

• A competitive inhibitor reacts reversibly with the enzyme to form an enzymeinhibitor complex

• In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

• The competitive inhibitor does not affect the rate of breakdown of the enzymesubstrate complex.

• The competitive inhibitor does not affect the rate of breakdown of the enzymesubstrate complex.

A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has

• twice the number of chromosomes and four times the amount of DNA

• same number of chromosomes but twice the amount of DNA

• twice the number of chromosomes and four times the amount of DNA

• twice the number of chromosomes and four times the amount of DNA

Which of the following statements is not correct?

• Brunner's glands are present in the submucosa of stomach and secrete pepsinogen

• Goblet cells are present in the mucosa of intestine and secrete mucus

• Oxyntic cells are present in the mucosa of stomach and secrete HCl.

• Oxyntic cells are present in the mucosa of stomach and secrete HCl.

25.

Gastric juice of infants contains

• maltase, pepsinogen, rennin

• nuclease, pepsinogen, lipase

• pepsinogen, lipase, rennin

• pepsinogen, lipase, rennin

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?

• Falling O₂ concentration

• Rising CO₂ concentration

• Falling CO₂ concentration

• Falling CO₂ concentration

Blood pressure in the mammalian aorta is maximum during

• systole of the left atrium

• diastole of the right ventricle

• systole of the left ventricle

• systole of the left ventricle

Which one of the following is correct?

• Plasma = Blood – Lymphocytes

• Serum = Blood + Fibrinogen

• Lymph = Plasma + RBC + WBC

• Lymph = Plasma + RBC + WBC

Removal of proximal convoluted tubule from the nephron will result in

• more diluted urine

• more concentrated urine

• no change in quality and quantity of urine

• no change in quality and quantity of urine

Sliding filament theory can be best explained as

• When myofilaments slide pass each other actin filaments shorten while mysoin filament do not shorten

• Actin and Myosin filaments shorten and slide pass each other

• Actin and Myosin filaments do not shorten but rather slide pass each other

• Actin and Myosin filaments do not shorten but rather slide pass each other