List of top Questions asked in IIT JAM BT

In a farm animal breeding programme, the animal with the dominant A phenotype, the recessive b phenotype, the dominant D phenotype, and the recessive e phenotype are commercially important. The inheritance of these traits follows Mendelian laws. From the tetra-hybrid cross of two genotypes AaBbDdEe and AaBbDdEe, the expected frequency of offspring that will show all the above-mentioned desired phenotypes is ................... (rounded off to 3 decimals)

The limit of the function \( \lim_{x \to 2} \frac{2x^2 + 2x - 12}{x^2 - 4} \) is .............. (rounded off to 1 decimal)

Which of the following statement(s) is/are CORRECT for lac repressor expressed from the lacI gene?

Which of the following metabolite(s) accumulate(s) in the blood of a human adult consuming a ketogenic diet?

In ‘Futile Cycle’ chemical energy is dissipated as heat due to two opposite biochemical reactions. Which of the following biochemical reaction(s) is/are a part of ‘Futile Cycle’?

Which of the following statement(s) is/are CORRECT in the classical ‘ABC model’ for genetic control of flower development?

Four alkyl halides, MeBr, EtBr, iPrBr, and tBuBr, undergo S\(_N\)2 reactions in the presence of hydroxide ion to yield the corresponding alcohols and the halide ion. The CORRECT order of the alkyl halides based on the rates of reactions is

Which of the following statement(s) is/are CORRECT about Deinococcus radiodurans?

Which of the following statement(s) is/are CORRECT about 'stringent response' in bacteria?

The method(s) used to detect a DNA fragment of 150 base pairs is/are

The component(s) of the apoptosome is/are

Which of the following is the CORRECT combination of a synthetic auxin and a synthetic cytokinin?

Mechanism of antibacterial action of polymyxins relies on the

The 5' cap of eukaryotic mRNAs contains

Which one of the following statements is CORRECT about Agrobacterium tumefaciens-mediated plant transformation?

Which of the following conditions is CORRECT for free expansion of an ideal gas under adiabatic condition? (q = heat, \(\Delta T = \) temperature difference, w = work)

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

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

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

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?

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

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