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Biology
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Which component of the vaccine stimulates an immune defence? How do they prevent people from catching the disease e.g. mumps?

inactive pathogens 

white blood cells produce antibodies 

these antibodies can be then quickly released whrn the immune system comes into contact with the live pathogen and destoy it 

IR
Answered by Ines R. Biology tutor
2787 Views

Does water travel up or down the concentration gradient?

Via osmosis, water travels down the concentration gradient to an area of lower water concentration and higher concntration of other substances.

JR
Answered by Jenny R. Biology tutor
7238 Views

What is the definition of osmosis? How is it different from diffusion?

Osmosis is the net movement of water molecules from a high water potential to a low water potential through a semi-permeable membrane. It is different from diffusion as it is through a semi-permeable memb...

CB
Answered by Coral B. Biology tutor
4951 Views

name 3 organelles that are present only in plant cells

cell wall, vacoule, chloroplasts 

SS
Answered by Sagar S. Biology tutor
3767 Views

Describe the benedicts test for non reducing sugars

  1. heat with HCl 2) neutralise with NAHCO3 3) add benedicts soln and gently heat in a water bath 4) if the soln changes colour from blue to a brick red precipitate, then non reducing sugars were involv...
SS
Answered by Sagar S. Biology tutor
9758 Views

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