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IIT Jam BT Papers;
Q.1
Which on e of the following most accurately
describes the process of natural selection?
(A)
Selection of on e species over a competing species
(B)
Selection of individuals that successfully defend themselves against enemies
(C)
Selection of individuals that produce more than the average number of offspring
(D)
Selection of individuals that are more attractive to the opposite sex


Q.2
Identify the statement that is
TRUE
of operons.
(A) Fine regulation of the expression of indi
vidual genes are made possible by operons
(B) Only genes involved in carbohydrate metabolism are present in operons
(C) Feedback inhibition of the biosynthesis of mu
ltiple enzymes by a single small molecule is made
possible by operons
(D) In the case of inducible operons, the inducer binds to the operator


Q.3
Signaling pathways usually comprise of several intermed
iate steps that are arranged in the form of a
cascade. What is the primary outcome of such an arrangement?
(A) Specificity of signal transduction
(B) Specificity of the cellular response
(C) Amplification of the cellular response
(D) Fine-tuning of the cellular response


Q.4
Which among the following contain(s) oxygen
-rich blood in the human vascular system?
I. Right ventricle
II. Aorta
III. Pulmonary vein
(A)
I on ly (B)
I and II on ly
(C)
I, II and III (D)
II and III on ly

Q.5
Choose the option that lists the correct sequence of steps involved in gene therapy.
P.
Injection of expression vector into patient
Q.
Wild-type gene is inserted into expression vector
R.
Wild-type gene is isolated and cloned
S.
Wild-type gene is transcribed and translated in the patient
(A) Q, S, P, R (B) Q, P, R, S (C) R, P, Q, S (D) R, Q, P, S

Q.6
Cephalin, a biological surfactant, is
(A) choline phosphoglyceride
(B) ethanolamine phosphoglyceride
(C) glycosphingolipid
(D) sphingolipid


Q.7
The major product(s) produced by gas phase UV irradiation of 2-pentanone is (are)
(A) acetone and ethene
(B) acetic acid and propionic acid
(C) 2-pentanol
(D) cyclopentane
Q.8
If a projectile lifts off from the surface
of the Earth with a speed of 11.2 km.s
–
1
, then it can escape
from the Earth’s gravitational field completely. Th
is is called the escape velocity. If the radius of
the Earth were 2 times larger and the mass 8
times larger, then the escape velocity (in km.s
–1
)
would be
(A) 5.6 (B) 11.2 (C) 22.4 (D) 44.8

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