Fill in the blanks:

(a) The first antibiotic penicillin was discovered by …………… .

(b) …………… bacteria is found living in the nodules on the roots of leguminous plants.

(c) The hormone …………… was the first substance produced by Escherichia coli.

(d) …………… is an example of denitrifying bacteria.

(e) …………… and …………… are the two heterotrophic modes of nutrition in bacteria.

Name the bacteria that converts

(a) ammonium compounds to nitrites

(b) nitrites to nitrates

Why is spore formation in bacteria not considered a form of reproduction?

In what respect do you consider bacteria as simple organisms?