The first restriction endonuclease to be isolated was :

Which Assisted Reproductive Technology (ART) is more suitable when the male partner has low sperm count?

Given below are some statements which should be followed to avoid sexually transmitted infections.
Which of the following are correct?
(A) Avoid sex with unknown partners/multiple partners.
(B) Always use medicated IUDs during coitus.
(C) In case of doubt always consult a qualified doctor and get complete treatment if diagnosed infection.
(D) Adopt natural methods of contraception during coitus.
(E) Use of oral pills before coitus.
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Read the following passage carefully and answer the given questions. During anaerobic sludge digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as source of energy as it is inflammable. The bioactive molecule, cyclosporin A, that is used as an immunosuppressive agent in organ-transplant patients, is produced by the fungus Trichoderma polysporum. You must have noticed that bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of pectinases and proteases. Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol. The BOD test measures the rate of uptake of oxygen by microorganisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water.
Statins, used as blood-cholesterol lowering agents are produced by -

Which one of the following statements is incorrect about ecological
pyramids?

The sex determination in honey bee is based on the number of sets of chromosomes an individual receives. So, the males are ______ having ______ .

Arrange the following PCR steps in the correct sequence.
A. Extension of Primers
B. Amplification of DNA
C. Annealing of Primers
D. Denaturation of DNA fragment
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Arrange the following compounds in increasing order of their reactivity towards HCN .




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Which of the following will not be sweet in taste?

The number of individuals in the reproductive age group is more than the number of individuals in the pre-reproductive age group, the shape of its age pyramid would reflect the growth status of the population as:

The sex chromosomes of a female bird have:

A transcription unit in DNA is defined primarily by the following regions -
(A) Structural gene
(B) A terminator
(C) A promoter
(D) Exon
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A coil with an inductance of 0.2 H has an inductive reactance of \( 62.8 \, \Omega \) at a certain frequency. The frequency is