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.
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
B.
Rising CO2 concentration
When we hold our breath, CO2 concentration rises and accumulates in blood and lungs, triggering impulses from respiratory centre part of brain. The body has the ability to detect rising CO2 levels and send signals to take a breath, so as to compensate the lowering levels of O2 in blood and lungs. Gases diffuse from air to blood passively, i.e. from high concentration to low.
When lungs become concentrated with same CO2 as in blood, it no longer leaves blood and keep rising till next birth. As one breathes in CO2 diffuse out of lungs and oxygen is taken in. Thus, neutralising the acidity by high CO2 levels.
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
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