List of top Life Science Questions

The presence of excess glucose has been known to prevent the induction of lac operon as well as other operons controlling enzymes involved in carbohydrate metabolism in E. coli. Which of the following processes define(s) the phenomenon?
Which one of the following represents a true “Ecological population”?
Which of the following animals show “Bottle cells” during the gastrulation stage of development?
Which of the following is/are the causative agent(s) of Filariasis?
In a population of 1000 wild dogs in a grassland, 360 and 480 dogs had black body colour with genotypes BB and Bb, respectively. In the same population, remaining dogs were white in colour with a genotype of bb. Based on this data, the frequency of allele “b” in the population is _______ (round off to one decimal place).
The organisms that obtain energy from inorganic compounds are known as:
Which of the following antibiotics is/are isolated from Streptomyces spp.?
Which of the following statements about the primary and secondary adaptive immune responses to an antigen is/are correct?
The spontaneous, and induced mutations in bacteria can be distinguished by
Which one of the following is NOT correct about antibiotic resistance mechanism in microbes?
Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: Endospore can survive heat that would rapidly kill vegetative cells of the same species.
Reason [r]: In endospore, the protoplasm is reduced to minimum volume as a result of the accumulation of calcium-dipicolinic acid complexes and small acid-soluble spore proteins, which forms a cytoplasmic gel and a thick cortex.
Which one of the following conjugations will result in formation of merodiploids?
Which of the following genus is/are a spirochete(s)?
Which of the following is/are non-membrane bound inclusion bodies?
Which one of the statements about bacterial flagella is correct?
Microbial plastics are made from:
The correct sequence of metabolic intermediates in the Krebs cycle is:
Catabolite repression in bacteria is regulated by the concentration of
Phagocytosis was first described by
Which one of the following statements about batch culture of microbes is NOT correct?
Monkeypox is caused by a
Which one of the following converts sulfate to hydrogen sulfide?
Blue light can directly induce opening of stomata. Blue light also triggers photosynthesis in the guard cells, which indirectly induces stomatal opening. Which one or more of the following experimental approaches would test the direct effect of blue light on stomatal opening?
A cytoplasmic male-sterile female plant with the restorer (nuclear) genotype rr is crossed to a male-fertile male plant with the genotype RR. Both RR and Rr can restore the fertility, whereas rr cannot. When an F1 female plant with Rr genotype was test-crossed to a male-fertile male plant with the rr genotype, the percentage of the population that is male fertile would be _______. (Answer in integer)
Central vascular cylinder or stele consists of the primary vascular system (xylem and phloem) and the associated fundamental tissue. Match the schematics of stele in Group I (xylem shown in green, and phloem shown as with their respective types in Group II. \includegraphics[width=0.75\linewidth]{image58.png}