What is interferon? How does interferon check infection of new ce…

Question

What is interferon? How does interferon check infection of new cells?

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Answer

Virus-infected cells secrete proteins called interferons. Interferons protect other cells from infection. They act like cytokinin barriers.

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S. No.	Column I	S. No.	Column II
A.	Cleavage	1.	Outer layer of the blastocyst that attaches to the endometrium during implantation.
B.	Implantation	2.	Mitotic divisions of the zygote in quick succession.
C.	Inner cell mass	3.	Embedding of the blastocyst in the endometrium of uterus.
D.	Trophoblast	4.	Release of secondary oocyte from the ovary.
E.		5.	Group of cells attached to one end of trophoblast that differentiate into embryo proper.

$\frac{\text{dN}}{\text{dt}}=\text{rN}$

How does the increase and the decrease in the value of 'r' affect the population size?

The end result of organic evolution is many different species, each adapted to specific environments.
Many more individuals are produced each generation that can survive and reproduce.
Gradually, over long periods of time, a population can become well adapted to a particular environment.
There are inheritable variation among the members of a population.
Individuals with adaptive characteristics are more likely to be selected to reproduce by the environment.