Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

Why is distillation required for producing certain alcoholic drinks?

Write the most important characteristic that Aspergillus niger, Clostridium butylicum, and Lactobacillus share.

Give any two microbes that are useful in biotechnology.

Name any two industrially important enzymes.

Name an immune immunosupressive agent?

How was penicillin discovered?

Name the scientists who were credited for showing the role of Penicillin as an antibiotic?

How do bioactive molecules of fungal origin help in restoring good health of humans?

What roles do enzymes play in detergents that we use for washing clothes? Are these enzymes produced from some unique microorganisms?

What is a broad spectrum antibiotic? Name one such antibiotic.

Which bacterium has been used as a clot buster? What is its mode of action?

Which of the following enzymes catalyse the removal of nucleotides from the ends of DNA?

Which of the given statements is correct in the context of visualizing DNA molecules separated by agarose gel electrophoresis?

'Restriction' in Restriction enzyme refers to ______.

In agarose gel electrophoresis, DNA molecules are separated on the basis of their ______.

While isolating DNA from bacteria, which of the following enzymes is not required?

The role of DNA ligase in the construction of a recombinant DNA molecule is ______.

Which of the following bacteria is not a source of restriction endonuclease?

Which of the following statements does not hold true for restriction enzyme?

Would you choose an exonuclease while producing a recombinant DNA molecule?