Patients who have undergone organ transplants are given anti-rejection medications to-
(A) minimize infection
(B) stimulate B-macrophage cell interaction
(C) prevent T-lymphocyte proliferation
(D) adopt the HLA of donor
The CO2 in the blood is mostly carried-
(A) by hemoglobin in RBCs
(B) in the cytoplasm of WBCs
(C) in the plasma as bicarbonate ions
(D) by plasma proteins
The Na+/K+ pump is present in the plasma membrane of mammalian cells where it-
(A) expels potassium from the cell
(B) expels sodium and potassium from the cell
(C) pumps sodium into the cell
(D) expels sodium from the cell
A protein with 100 amino acid residues has been translated based on triplet genetic code. Had the genetic
code been quadruplet, the gene that codes for the protein would have been-
(A) same in size
(B) longer in size by 25 %
(C) longer in size by 100 %
(D) shorter in size
If you fractionate all the organelles from the cytoplasm of a plant cell, in which one of the following sets of
fractions will you find nucleic acids ?
(A) nucleus, mitochondria, chloroplast, cytoplasm
(B) nucleus, mitochondria, chloroplast, glyoxysome
(C) nucleus, chloroplast, cytoplasm and peroxisome
(D) nucleus, mitochondria, chloroplast, Golgi bodies
A person has difficulty in breathing at higher altitudes because-
(A) oxygen is likely to diffuse from lungs to blood
(B) oxygen is likely to diffuse from blood to lungs
(C) partial pressure of O2 is lower than partial pressure of CO2
(D) overall intake of O2 by the blood becomes low
The adsorption isotherm for a gas is given by the relation x = ap/(1 + bp) where x is moles of gas adsorbed
per gram of the adsorbent, p is the pressure of the gas, and a and b are constants. Then x
(A) increases with p
(B) remains unchanged with p
(C) decreases with p
(D) increases with p at low pressures and then remains the same at high pressure