Apart from BE/ BTech , you can pursue B.Sc-M.Sc & PhD in biotechnology. The areas of work of biotechnologists are :-

• Drug Discovery- These scientists employ expertise in molecular biology, cell biology, pharmacology and today's hot biotechnology like gene therapy or antigens to discover new drug molecules.
• Bioinformatics- As biotechnology or precisely generics is mapping human genes, animals and plants, enormous amount of information is being generated. This information is about the nature and structure of the billions of genes that are mapped. Bioinformaticsspecialists are combing knowledge of structural biology, computational chemistry , mathematics and information technology to manage the huge information databases.
• Bioprocess Engineering- various products like alcohol, processed foods, vegetable, meat products, enzymes required in pharmaceutical formations etc are manufactured by biological processes. There are scientists working in this area of bio processing to solve manufacturing problems, developing new processes and so on.
• Genetics- In this field scientists conduct research into the biochemical and physiological aspects of heredity, specializing in the examination of DNA. They often concentrate on human genetics, which involves studying the biological basis for human variation and the causes of human genetic conditions. They are also directly involved in patient care including prenatal diagnosis for genetic diseases and genetic counseling.
• Biochemistry-Biochemist study the chemical make up of living matters as well as the molecular basis for the process that occur in cells. They develop medical, agricultural, food science, pharmacological, industrial , environmental and other practical applications using their scientific expertise.
• Microbiology-Microbiologists study the growth and characterstics of micro organisms, such as viruses, bacteria, fungi, moulds and parasites as well as their interactions with the environment. They develop industrial,medical and other practical applications.