Level: F.Sc (Pre-Engg)
Class: 1st Year
Board: Punjab Textbook Board
Chapter 5: Variety of Life
Type: Short Questions
Author: Kiran Mehtab
PDF Size: 2 MB
How many types of life-cycles, have been observed in Bacteriophages?
Two types of life-cycles, have been observed in Bacteriophages:
- lytic cycle
- lysogenic cycle
With which material Jenner vaccinated 8 years old boy?
In 1796, Edward Jenner first vaccinated an 8 years old boy with material removed from cowpox lesion on the hand of milkmaid
When filterable agents were first purified?
The filterable agents were first purified in 1935, when Stanley was successful in crystallizing the tobacco mosaic virus.
What is the size of viruses?
Viruses range in size from 250 nanometer (nm) of poxviruses to the 20 nm of parvovirus.