List of top Life Science Questions

Which one of the following amino acids has more than two acid-base groups?

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: On a per carbon basis, palmitic acid yields more ATP than glucose.
Reason [r]: Carbons in palmitic acid are more reduced than those in glucose.

When cell components are fractionated by sedimentation, the correct order (from lower to higher gravitational force, g) in which the components get separated is .................

In a population, the probability of a susceptible individual getting infected with SARS-CoV-2 is low when a majority of individuals in the population becomes immune to this virus. This phenomenon is known as _______.

Given below are four reactions of the glycolytic pathway catalyzed by the enzymes E1, E2, E3, and E4, as indicated. Which of these enzymes is/are NOT part of the gluconeogenesis pathway?
(i) Fructose-6-phosphate \(\xrightarrow{\text{E1}}\) Fructose-1,6-bisphosphate
(ii) Fructose-1,6-bisphosphate \(\xrightarrow{\text{E2}}\) DHAP + GAP
(iii) 3-Phosphoglycerate \(\xrightarrow{\text{E3}}\) 2-Phosphoglycerate
(iv) Phosphoenolpyruvate \(\xrightarrow{\text{E4}}\) Pyruvate)

Which of the following molecules is/are second messenger(s) produced by the phosphoinositide signaling cascade?

A protein has seven cysteine residues. The maximum number of disulfide bonds of different combinations that can possibly be formed by these seven cysteine residues is ................ (in integer).

According to Hard–Soft Acid–Base (HSAB) principle, the CORRECT option(s) for the solubility trend in water is/are

The number of radial node(s) for the valence orbital of U(III) ion is _______ (in integer). (Given: Atomic number of U is 92)

Choose the CORRECT trend(s) of the first ionization energies among the following. (Given: Atomic numbers C: 6; N: 7; O: 8; F: 9; Si: 14; P: 15; S: 16; Cl: 17)

The depression of freezing point of water (in K) for 0.1 molal solutions of NaCl and Na$_2$SO$_4$ are $\Delta T_1$ and $\Delta T_2$, respectively. Assuming ideal solutions, find the ratio $\Delta T_1/\Delta T_2$ (rounded off to two decimal places).

Consider two different paths in which the volume of an ideal gas doubles isothermally: (i) Reversible expansion (work done = \( w_{\text{rev}} \))
(ii) Irreversible expansion, with the external pressure equal to the final pressure of the gas (work done = \( w_{\text{irrev}} \)) Here, \[ \dfrac{w_{\text{rev}}}{w_{\text{irrev}}} = ? \]

Which one among the following mixtures gives a buffer solution in water?

The CORRECT order of stability of the given metal oxides is

Which one or more of the following is/are developmental feature(s) of hatchlings of an altricial bird species?

Which one or more of the following is/are characteristic of r-selected animals?

Which one or more of the following options describe(s) how ferns differ from angiosperms and gymnosperms?

Compared with bony fish, many shark species show steeper population declines in response to heavy fishing pressure. Which one of the following options explains this?

Whales and dolphins are hypothesized to have evolved along the northern shore of the Tethys Sea, prior to the Indian plate’s collision with the Eurasian plate. To which one of the following animals are these aquatic mammals most closely related?

The table below lists different insects and taxonomic orders. Choose the option that matches the animal to its correct taxonomic order. Animal Taxonomic order P) Moths i) Hemiptera Q) True bugs ii) Orthoptera R) Crickets iii) Coleoptera S) Beetles iv) Lepidoptera v) Diptera

In haplodiploid organisms, males are haploid and females are diploid. Consider the relatedness diagram shown below. Female A has a full-sister, Y, who has a daughter, B. The relatedness between A and B is ___________. (Rounded off to three decimal places)

The production of anthocyanin pigments in pea flowers requires the presence of at least one dominant allele in each of two independently assorting genes, C and P. The presence of anthocyanin results in purple flowers, whereas its absence gives white flowers. A cross between two double heterozygous (CcPp) plants is performed. What is the expected ratio of plants with purple flowers to plants with white flowers?

Match the diseases to the pathogens that cause them. Diseases Pathogens P) Avian malaria i) Virus Q) COVID-19 in humans ii) Plasmodium R) Chytrid disease in frogs iii) Mosquito iv) Fungus