List of top Biological Science Questions

In a human cell, \( \beta \)-oxidation of a saturated fatty acyl CoA molecule produced 8 acetyl CoA, 7 H₂O and 28 ATP. The oxidised fatty acyl CoA is
If a fossil that has been discovered recently contains 0.2% of the \(^{14}C\) (t₁/₂ = 5,730 years) that was present when the fossil was formed, then the age of the fossil in years is likely to fall in the range of
Which one of the following statements is INCORRECT for competitive inhibition in an enzyme catalysed reaction?
Which one of the following statements is TRUE for dynein and kinesin family of motor proteins?
A photosynthetic algal filament is illuminated with white light that has passed through a prism such that the left and the right ends of the filament receive violet and red lights, respectively. The amount of oxygen released by this filament will be
Naive T lymphocytes can be stimulated by the activated dendritic cells that bear
In rearrangement of immunoglobulin heavy chain, N-nucleotides
If y = x², then dx/dy is
Which one of the following is TRUE for the function \( y = x^2 + 1 \)?
The core glycan moiety of N-linked glycoproteins contains
Organophosphate pesticides kill insects by inhibiting
The molecular weight (Da) of the zwitterionic form of the peptide GAGAGAGA is closest to
Thomas Cech discovered RNA self-splicing in
Which one of the following conditions leads to an approximately 50-fold increase in RNA transcription of the lac operon? (CRP stands for cyclic AMP [cAMP] receptor protein)
Which one of the following photosynthetic organisms does not release oxygen as a by-product of the light reaction?
In plant systematics, which one of the following species belongs to the branch at the very base of the angiosperm phylogenetic tree?
Tropic hormones or tropins are secreted by
Which one of the following is necessary for evolution to be driven by genetic drift?
In a plant species, yellow seed colour (Y) is completely dominant over white (y). A genetic cross between plants with yellow seeds and plants with white seeds yielded a progeny of 48 yellow-seeded and 52 white-seeded plants. The genotypes of the yellow-seeded and white-seeded parent plants, respectively, are most likely to be
Biotin deficiency can arise due to consumption of diet rich in

Which one of the following matches is CORRECT between the inhibitors given in Group A with their modes of action in Group B? 
\[\begin{array}{|c|c|} \hline Group A & Group B \\ \hline \text{(P) Antimycin A} & \text{(i) Inhibits cytochrome c oxidase} \\ \hline \text{(Q) Amytal} & \text{(ii) Blocks electron transfer from cyt b to cyt c1} \\ \hline \text{(R) Carbon monoxide} & \text{(iii) Inhibits adenine nucleotide translocase} \\ \hline \text{(S) Atractyloside} & \text{(iv) Prevents electron transfer from Fe-S centers of complex 1 to ubiquinone} \\ \hline \end{array}\]
 

Let y = \(\sum_{n=1}^{3} nx^n\). The value of $\int_0^1$ y dx is .......... (decimal digits up to 2 places)
 

The length of each side of a regular octagon is 1 meter. The area of the octagon in m² is ............ (decimal digits up to 2 places)
Rod shaped E. coli is 2 µm long and has diameter of 0.8 µm. The average density of E. coli is 1.1 x 10³ g/L. The mass of single E. coli cell in pg is ........... (decimal digits up to 1 place)
Molecular weight of the genomic DNA of an organism is 3.96 x 10⁹ g/mol. The average molecular weight of nucleotide pair is 660 g/mol. If an average protein in this organism consists of a chain of 400 amino acids, the maximum number of proteins coded by DNA molecule will be ..............