Ecosystems — BIOLOGY STD 12 Science — Question

Draw a schematic sketch of pBR 322 plasmid and label the following in it:

1. Any two restriction sites.
2. Ori and rop genes.
3. An antibiotic resistant gene.

List the disadvantages of insulin obtained from the pancreas of slaughtered cow and pigs.

Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton also resistant to other pests as well?

Identify a, b, c, d, e and f in the table given below:

S. No.	Organism	Bioactive molecule	Use
A.	Monascus purpureus (yeast)	a	b
B.	c	d	antibiotic
C.	e	Cyclosporin A	f

What are 5' end and 3' end of a polynucleotide chain?

Answer the following questions:
Would Western Ghats ecosystems be less functional if one of its tree frog species is lost forever? Substantiate your answer in the light of hypothesis proposed by Paul Ehrlich.

To maintain the continuity of its life, Plasmodium protozoa requires both mosquito and human hosts.” Explain.

Given below are the events that are observed in artificial hybridisation programme. Arrange them in the correct sequential order in which they are followed in the hybridisation programme.
(a) Re-bagging; (b) Selection of parents; (c) Bagging; (d) Dusting the pollen on stigma; (e) Emasculation; (f) Collection of pollen from male parent.

Explain innate immunity