Griffith's Experiment

Q. Transformation was discovered by:

1. Meseson and Stahl
2. Hershey and Chase
3. Griffith
4. Watson and Crick

Q.

In Griffith’s transformation experiment, the conversion of R strain to S strain was due to:

1. Transfer of transforming principle from live R strain to heat-killed S strain bacteria

2. Uptake of naked DNA from medium by heat-killed S strains

3. Transfer of transforming principle from heat-killed S strains to live R strains

4. Uptake of transforming principle from medium by heat-killed S strains to become live S strains.

Q. ________ are an exception to cell theory.

1. Virus
2. Lichen
3. Bacteria
4. Fungi

Q.

The first undoubted evidence about DNA being the genetic material came from :

1. Transformation of a rough strain of Streptococcus pneumoniae to the smooth strain.

2. The establishment of DNA as the chief chemical constituent of chromosomes.

3. The establishment of DNA as self-replicating substance.

4. Transduction of bacteria by the action of bacteriophage.

Q.

Which of the following is a mismatch?

1. Live R strain - Non-virulent

2. Heat-killed R strain - Virulent

3. Live S strain - Pathogenic

4. Heat-killed S strain - Non-pathogenic

Q. The layer of bacterial cells which allows them to hide from host's immune system is