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1) Within a population there is variation among individuals 2) Some of these individuals will be better suited to survive in their environment 3) These individuals are more likely to survive and as a result ...

1) Dead/Inactive/Attenuated Microorganisms activate immune response 2) White blood cells produce antibodies 3) Antibodies kill microorganisms 4) This allows for a faster response during reinfection

Enzymes are molecules in the body that break down specific substrates which can then be used for energy or stored. An enzyme contains an active site that is complementary in shape to the substrate being brok...

People are immunised against pathogens through vaccination - usually an injection. A vaccine is comprised of dead , inactive or weakened pathogen or virus. These act as antigens (foreign proteins) that the b...

An enzyme is a protein that act as a biologcal catalyst, meaning that they will activate a biological reaction. Enzymes are very specific and will work with a specific substrate. You can think of an enzyme a...