Organisms and Populations — BIOLOGY STD 12 Science — Question

Now, sequencing of total genomes getting is getting less expensive day by the day. Soon it may be affordable for a common man to get his genome sequenced. What in your opinion could be the advantage and disadvantage of this development?

Explain three main functions of free antibodies produced by B-lymphocytes.

Identify A, B, C, D, E and F in the table given below:

S. No.	Component-I	Component-II	Chemical linkage bonding the two components	Product
(i)	A	B	C	Nucleotide
(ii)	Nucleotide	D	E	Nucleotide
(iii)	Nucleotide	Nucleotide	F	Dinucleotide

β−galactosidase enzymes site is a preferred selectable marker in comparison to antibiotic-resistant selectable marker in biotechnology experiments. Justify.

Explain the changes that milk undergoes when suitable starter/ inoculum is added to it. How does the end product formed prove to be beneficial for human health?

Give physiological effects and applications of cytokinin.

What are antibiotics? Name the classes of organisms that produce antibiotics

Discuss about discovery of Gibberellins.

Give reasons : Expiration is called a passive process.

Give reasons : Additional apoplastic pathway through secondary roots is beneficial to plants.