OBJECTIVE LIFE SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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He showed that micro-organisms are all around us.
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He drank sterilized broth.
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He held micro-organisms.
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None of the above
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Detailed explanation-1: -During the mid-to late 19th century Pasteur demonstrated that microorganisms cause disease and discovered how to make vaccines from weakened, or attenuated, microbes. He developed the earliest vaccines against fowl cholera, anthrax, and rabies.
Detailed explanation-2: -By sterilizing cultures and keeping them isolated from the open air, Pasteur found that contamination of the media only occurred upon exposure to the outside environment, showing that some element was needed to give rise to life. In other words, life does not arise spontaneously.
Detailed explanation-3: -By passing the virus through rabbits, Pasteur made the virus less dangerous to human hosts, while still giving the body enough information to recognize the antigen and develop immunity to the “wild” version of the disease.