Question

1.4.2 test (cst): heredity
question 19 of 25
what new knowledge was gained from frederick griffiths work with
preumococci bacteria?
a. bacterial strains cannot change from one generation to the next.
b. the transforming principle in bacterial strains is carried by
proteins.
c. bacteria contain a physical substance that can change the
structure of other bacteria.
d. transforming principles exist only in bacteria.

Explanation:

Griffith's experiment showed that harmless bacteria could be transformed into harmful ones. This indicated that there was a "transforming principle" (later found to be DNA) in bacteria that could change the properties (structure - in terms of being harmful or not) of other bacteria. Option A is wrong as his work showed bacteria can change. Option B is incorrect as later work showed it was DNA not proteins. Option D is false as transforming principles (like DNA) are not exclusive to bacteria.

Answer:

C. Bacteria contain a physical substance that can change the structure of other bacteria.