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Count the biotech numbers

Exercise and reference answers

Questions
  1. Answer
    2
    Question
    How many chains does human insulin have?
  2. Answer
    1983
    Question
    In which year did Eli Lilly make insulin chains?
  3. Answer
    1990
    Question
    In which year was the first gene therapy given?
  4. Answer
    4
    Question
    How old was that first patient?
Instructions
Type the number only.

Explanation

_Source: syllabus Biology, Ch 12 'Biotechnology and its Applications'_
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