Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Name the enzyme produced by Streptococcus bacterium. Explain its importance in medical sciences.

What does ‘competent’ refer to in competent cells used in transformation experiments?

How does an amoeba respond to unfavourable conditions, and on arrival of favourable conditions?

What is gene flow?

Describe the situations in which independent assortment of genes results in 50% recombination.

Describe the technique by which genetic disorder in a developing foetus can be detected.

What does ICSI stand for? Describe the technique.

There is decrease in species diversity at higher altitude.

Shyam Lal and his wife have been advised by the gynaecologist to go for artificial insemination. What may have been the reason for the doctor to give such an advice? Explain.

Classify the following composition of blood plasma given below as per Column ‘A’ and complete Column ‘B’. Select from the given options
(i) Serum albumin
(ii) Bicarbonates
(iii) Urea
(iv) Sulphates of sodium
(v) Fibrinogen
(vi) Uric acid

Column A	Column B
(1) Plasma proteins	————
(2) Nitrogenous waste	————
(3) Inorganic salts	————