List of top Questions asked in IIT JAM BT

The 5' cap of eukaryotic mRNAs contains

The receptors for gamma amino butyric acid (GABA) in humans are

The IR stretching frequency of the carbonyl (C=O) group of a typical saturated ketone is 1715 cm\(^{-1}\). The IR stretching frequencies for the carbonyl groups present in three different acetophenone derivatives are given. Match the molecules in Group I with their corresponding frequencies in Group II. \[ \begin{array}{c|c} \text{Group I} & \text{Group II (C=O stretching frequency cm}^{-1}\text{)}
\hline P:\; p\text{-amino acetophenone} & 1:\; 1677
Q:\; p\text{-nitro acetophenone} & 2:\; 1700
R:\; p\text{-methoxy acetophenone} & 3:\; 1684
\end{array} \]

Two charges \(10 \times 10^{-8}\,\text{C}\) and \(-6 \times 10^{-8}\,\text{C}\) are located 16 cm apart. The point(s) on the line joining the two charges, where the net electric potential is zero, will be [Take the potential at infinity to be zero]

Which of the following cell types is infected by the human immunodeficiency virus-1?

Bacterial cloning vectors and bacterial expression vectors are differentiated by the presence of

The final stage of peptidoglycan (PG) biosynthesis is marked by PG cross-link formation and remodeling. Which of the following enzymes does NOT take part in these processes?

Which of the following activities is NOT possessed by the human immunodeficiency virus-1 reverse transcriptase?

The first evidence of ‘gene transfer’ was demonstrated in 1928 by

Which of the following represents the CORRECT order of events in the eukaryotic cell cycle?

Which of the following statements about eukaryotic asymmetric cell division is NOT correct?

The standard free energy change (\(\Delta G^0\)) of the binding reaction between different sweet molecules and a common sweet taste receptor are given. Which amongst these molecules is the sweetest at the same molar concentration?

Which of the following terrestrial biomes has the highest animal diversity?

Sequence comparison of which of the following genes is used as a measure of evolutionary divergence across bacterial species?

What is the ploidy level of a sporophyte in angiosperms?

The correct order of electronegativity of the given elements is

An electric circuit with a resistor of constant resistance ‘R’ is maintained at a constant voltage ‘V’. Based on Ohm’s law, if the current ‘I’ through the circuit is doubled, the power ‘P’ dissipated across the resistor is

Which one of the following hormones is produced by the adrenal gland?

In humans, Down syndrome is caused by

After how many cycles of polymerase chain reaction (PCR), the amplified product of required length is generated for the first time from a chromosomal DNA template?

In DNA replication, the Okazaki fragments are joined by

A box of mass 20 𝑘𝑔 is pulled at constant speed across a floor by a rope. The rope makes an angle of 45° with the horizontal. Assuming that friction is negligible, the work done in pulling the box by a distance of 20 𝑚 is _____ 𝐽 (rounded off to the nearest integer). (Use $𝑔 = 9.8 𝑚𝑠^{−2}$)

The data provided in the table were obtained from the following reaction, carried out at 273 𝐾.
𝐴 + 𝐵 → 𝐶 

Initial concentration of [𝐴] 𝑚𝑜𝑙 $𝐿 ^{−1}$	Initial concentration of [𝐵] 𝑚𝑜𝑙$𝐿 ^{−1}$	Initial rate of formation of [𝐶] 𝑚𝑜𝑙 $𝐿^{−1} 𝑠 ^{−1}$
0.2	0.2	0.3
0.4	0.2	0.6
0.4	0.4	2.4

The order of the reaction with respect to 𝐴 is _________.

Consider an enzyme that follows simple Michaelis-Menten kinetics, and has a $ 𝐾_𝑀 of 5 µ𝑀$. The initial velocity of the reaction will be 10% of the maximum velocity at a substrate concentration of µ𝑀 (rounded off to two decimal places).

Ammonia is synthesized in the Haber process in the following reaction.
$𝑁_2 (𝑔) + 3𝐻_2 (𝑔) → 2𝑁𝐻_3(𝑔)$ 
The temperature above which the reaction becomes spontaneous is __________ 𝐾 (rounded off to one decimal place). 
($\bigtriangleup 𝐻^0 = −92.2 𝑘𝐽, \bigtriangleup 𝑆^0 = −199 𝐽𝐾^{ −1}$ )