A disease was caused by a bacterium; you want to produce a biological product to kill this bacterium. Which product you have to produce? How can you use your biotechnological knowledge to produce it in high amount?

The product that must be produced to kill a bacterium —which causes a disease— is an antibiotic, which through biotechnology can investigate the structure of the bacterium and synthesize the chemical formula needed to produce antibiotics in high amounts.

Explanation:

Antibiotics are specific medicines for the treatment of infectious diseases, produced by bacteria. Antibiotics can kill bacteria and prevent their replication.

If a disease is produced by bacteria, the product that is necessary to kill those microbes is an antibiotic, for which biotechnology is useful.

By using biotechnology —a branch of biology that uses technology as a research and development tool— it is possible:

Know the structure, functions and behavior of pathogenic bacterial strains.
Create chemical formulas -antibiotics- that serve to effectively eliminate bacteria, and cure infectious diseases.
The synthesis and production of antibiotics on a large scale, allowing their sufficient availability for use.