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Q.88 Which one of the following is a “post–zygotic” isolating mechanism of speciation?(A) Behavioral isolation(B) Fertilization failure(C) Hybrid sterility(D) Seasonal isolation Correct Answer: (C) Hybrid sterility Hybrid sterility represents a […]

Q.87 The animals belonging to which one of the following phyla are characterized by“segmented body” ?(A) Annelida(B) Cnidaria(C) Echinodermata(D) Porifera Annelida is the correct answer (A). Animals in phylum Annelida […]

Q.86 During the development of a mammalian embryo, “yolk sac” is formed by whichone of the following?(A) Syncytiotrophoblast(B) Primitive endoderm (hypoblast)(C) Amniotic ectoderm(D) Embryonic epiblast Yolk Sac Formation in Mammalian […]

Q.85 Which one of the following is a “brood parasite” ?(A) Pigeon(B) Sparrow(C) Goose(D) Cuckoo Cuckoo is the brood parasite among the options. Brood parasitism involves a bird laying eggs […]

Q.84 A polymerase chain reaction (PCR) based diagnosis test was performed on abacterial sample targeting a specific gene. There are 3 copies of this gene inthe bacterial genome. Prior to […]

Q.83 The doubling time of Escherichia coli is 30 minutes in a culture mediumcontaining glucose and yeast extract. Phage T7 has a life cycle of 20 minutesand a burst size […]

Q.82 Which option(s) correctly match(es) the Antibiotic with their corresponding Target? Antibiotic Target P. Penicillin i. Ribosome Q. Kanamycin ii. RNA polymerase R. Rifampicin iii. DNA gyrase S. Nalidixic acid […]

Q.81 Which of the following reactions is/are catalyzed by aldolase?(A) Dihydroxyacetone phosphate + Glyceraldehye–3–phosphate → Fructose 1,6–biphosphate(B) Dihydroxyacetone phosphate + Erythrose–4–phosphate → Sedoheptulose–1,7–biphosphate(C) Dihydroxyacetone phosphate → Glyceraldehyde–3–phosphate(D) Glyceraldehye–3–phosphate + Erythrose–4–phosphate […]

Q.80 Which of the following is/are example(s) of animal–microbe mutualism?(A) Human – Mycobacterium tuberculosis(B) Dog – Rabies lyssavirus(C) Human – Lactobacillus plantarum(D) Cow – Ruminococcus albus Correct Answer: (C) and […]

Q.79 Which of the following statements regarding micro–organisms is/are correct?(A) The free–living bacterium Wolbachia is a human parasite.(B) Myxococcus are a group of predatory bacteria.(C) Dictyostelium is a slime mold […]