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
Consider an incomplete pyramid of balls on a square base having 18 layers; and having 13 balls on each side of the top layer. Then the total number N of balls in that pyramid satisfies
option
(A) 9000 < N < 10000
(B) 8000 < N < 9000
(C) 7000 < N < 8000
(D) 10000 < N < 12000
According to the original model of DNA, as proposed by Watson & Crick in 1953, DNA is a-
(A) left handed helix
(B) helix that makes a full turn every 70 nm
(C) helix where one turn of DNA contains 20 basepairs
(D) two stranded helix where each strand has opposite polarity
In the Arcitc region hemispherical houses called Igloos are made of ice. It is possible to maintain a temperature inside an Igloo as high as 20º C because
option
(A) Ice has high thermal conductivity
(B) Ice has low thermal conductivity
(C) Ice has high specific heat
(D) Ice has higher density than water
A solid cube and a solid sphere both made of same material are completely submerged in water but to different depths. The sphere and the cube have same surface area. The buoyant force is
(A) Greater for the cube than the sphere
(B) Greater for the sphere than the cube
(C) Same for the sphere and the cube
(D) Greater for the object that is submerged deeper
The rate of gas phase chemical reactions generally increases rapidly with rise in temperature. This is mainly
because
(A) the collision frequency increases with temperature
(B) the fraction of molecules having energy in excess of the activation energy increases with temperature
(C) the activation energy decreases with temperature
(D) the average kinetic energy of molecules increases with temperature
Let a, b, c, d be numbers in the set {1, 2, 3, 4, 5, 6} such that the curves y = 2x^3 + ax + b and y = 2x^3 + cx + d have no point in common. The maximum possible value of (a - c)^2 + b d is
A horse has 64 chromosomes and a donkey has 62. Mules result from crossing a horse and a donkey. State
which of the following is INCORRECT ?
(A) Mules can have either 64, 63 or 62 chromosomes
(B) Mules are infertile
(C) Mules have well defined gender (male/female)
(D) Mules have 63 chromosomes