Regulation of lac operon by repressor is referred to as:
Explain how the addition of lactose in the medium regulates the switching on of the lac operon in bacteria.
Answer the following questions:
Student to attempt either option (A) or (B):
(A) Give an account of the generalised structure of an antibody molecule produced by B-lymphocytes in response to the pathogen.
OR
(B) Other than public awareness and counselling, enlist four measures taken up by NACO, WHO and other NGOs to prevent the spread of HIV infection in the society.
Student to attempt either option (A) or (B):
(A) Explain what is meant by the term amniocentesis. How is this technique misused in India?
OR
(B) Name any two VDs which might occur in a human female. State any two complications in a female if it is left untreated.