Ingeniería en Biotecnología.

I study Engineering in Biotechnology because I'm interested in science and I really like the biological sciences, microorganisms, genetic engineering, biochemistry, engineering bioreactors, microbiology and organic chemistry.

Biotechnology is multidisciplinary and covers many of the industrial fields, for example: way (Not sure what you mean by this), medicine, agriculture, environment (remediation of soil, air, water).
Biotecnology is manipulating microorganisms to improve a product or provide a service, for example, isolating yeast microorganisms such as bacteria and fungi, subjecting a crop, growth and research to lead the industry. (This last sentence is a little hard to read and I'm not sure what you mean. Perhaps something like this would be better: "Biotechnology is manipulating microorganisms to improve a product or provide a service; for example, it is isolating yeast microorganisms such as bacteria and fungi to help crops grow and using this research to lead the industry.")

It is such an innovative science that it has led many pharmaceutical discoveries. Genetic engineering also has a lot to do with biotechnology, such as in the modification of microorganisms for hacvre (what is this word supposed to be?) resistors. 

Biotecnology is the wave of the future in innovative processes.

(A few of the things I changed were only to make your sentences sound more natural, such as changing "my interests are" to "I'm interested in" in the first line. Some of the other errors were things that I think you probably would have noticed with a second read through - don't go too fast and I think you'll be fine! Overall your English is quite good, it seems that you are learning lots of technical language as well which is both interesting and great. Keep at it!)