List of top Chemistry Questions asked in GATE Life Sciences

The human genetic code is triplet in nature with 64 codons made using four nucleotides. If the human genetic code was doublet in nature, the number of codons theoretically possible from four nucleotides is_____ (Answer in integer)

Which one or more of the following statements is/are correct regarding the transport and retention of proteins in different cell organelles?

Which one of the following use inorganic compounds as an energy source?

Each of the following alkenes undergoes addition reaction with bromine. Under the reaction conditions, the CORRECT trend in the reaction rates is

The pKa of a buffer solution with pH of 5, consisting of 0.4 M sodium acetate and 0.04 M acetic acid, is____(Answer in integer)

The CORRECT option(s) of Y for the following reaction is/are

Consider the following nucleotide sequence: 5'-GCCGCCAUGGCGUCUGCUAGCUGGCUCGAUCGCGAGCGAUCGUAC GUAUAGUAUGAA-3' Assume canonical initiation, canonical termination, no post-translational modification, and the average molecular mass of an amino acid to be 110 daltons. The theoretical molecular mass of the polypeptide translated from the above nucleotide sequence is _____ daltons. (Answer in integer)

Match the metabolic intermediates listed in Column I with their corresponding amino acids given in Column II.

Column I	Column II
P. a-Ketoglutarate	i. Histidine
Q.Ribose 5-phosphate	ii. Glutamate
R. 3-Phosphoglycerate	iii.Aspartate
S. Phosphoenolpyruvate	iv. Phenylalanine
	v.Serine

The molecule(s) with non-zero dipole moment is/are

The molecules A and B are a pair of___

Upon addition of compound X to an aqueous AgNO\(_3\) solution, a white precipitate appears instantly. Also, X does not exhibit geometrical isomerism. The CORRECT option(s) for X is/are:

The CORRECT order of acidity of the following compounds is

Which one of the following is the correct match between the molecular properties listed in Column I and the corresponding biochemical separation methods in Column II?I.

Column I	Column II
P. Solubility	i. Reverse phase chromatography
Q. Ionic charge	ii. Ultracentrifugation
R. Polarity	iii. Salting out
S. Molecular size	iv. Isoelectric focusing
	v. Gel electrophoresis

Match the metabolic intermediates listed in Column I with their corresponding amino acids given in Column II.

Column I	Column II
P. a-Ketoglutarate	i. Histidine
Q.Ribose 5-phosphate	ii. Glutamate
R. 3-Phosphoglycerate	iii.Aspartate
S. Phosphoenolpyruvate	iv. Phenylalanine
	v.Serine

In a lactic acid solution at pH 4.8, the concentrations of lactic acid and lactate are 0.01 M and 0.087 M, respectively. The calculated pKa of lactic acid is____ (Round off to one decimal place)

A newly identified viral protein contains one long a-helix spanning 60 amino acid residues. The number of main chain H-bonds formed in this helix is____ (Answer in integer)

Which one of the following pairs of amino acids is NOT incorporated in a polypeptide chain?

Given the standard reduction potentials (\( E^\Theta \)) for the half-cell reactions below, the standard Gibbs free energy of the dissolution of silver chloride in water, at 298 K, is __________ J mol\(^{-1}\) (rounded off to nearest integer).
(Given: Faraday constant, \( F = 96500 \, \text{C mol}^{-1} \); \( J = \text{C} \times \text{V} \))
\[\text{AgCl}(s) + e^{-} \rightarrow \text{Ag}(s) + \text{Cl}^{-}(\text{aq}); \quad E^\Theta = 0.22 \, \text{V at 298 K}\]
\[\text{Ag}^{+}(\text{aq}) + e^{-} \rightarrow \text{Ag}(s); \quad E^\Theta = 0.80 \, \text{V at 298 K}\]

The ionic product of water at 40 °C is \( 2.92 \times 10^{-14} \, \text{M}^2 \). The pH of water at 40 °C is __________ (rounded off to 2 decimal places).

The paramagnetic species among the following is/are (Given: Atomic numbers of Cr = 24; Fe = 26; Ni = 28):

Upon addition of compound X to an aqueous AgNO\(_3\) solution, a white precipitate appears instantly. Also, X does not exhibit geometrical isomerism. The CORRECT option(s) for X is/are:

The initial rate of a reaction triples when the concentration of a reactant, A, is doubled. The order of the reaction with respect to A is _______(rounded off to 2 decimal places).

One mole of an ideal gas expands isothermally and reversibly to double its volume. If the expansion work done by the system is 1728.85 J, the temperature of the system is ____ K (rounded off to 2 decimal places).
Given:
Gas constant, \( R = 8.314 \) J·K\(^{-1}\)·mol\(^{-1}\)

The maximum number of electrons that can be accommodated in the shell with n = 2 is______ (in integer). (Given: n = principal quantum number)

The CORRECT order of electronegativity is