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Biology
GCSE

MRSA and C. difficile are resistant bacterial strains which cause life-threatening infections in hospitals. Explain how MRSA/ C. difficile could arise from non-resistant bacteria. [6 marks]

Natural SelectionCompetition for survival between bacterial colonies/ Selection pressure is survivalVariation between colonies linking to phenotype of resistanceSpontaneo...

Answered by Ijaz C. Biology tutor
1997 Views

What is osmosis?

Osmosis is the passive diffusion of water, which therefore, doesn't require any energy to occur. Typically water will move from an area of high concentration to an area of low concentration across a semi-...

Answered by Matthew W. Biology tutor
2429 Views

Why does the bacteria in a vaccine not harm us, but instead make us immune to diseases?

In order to build immunity to a bacteria only a tiny amount of 'inactivated' bacteria is put into the vaccine. Because the bacteria is dead/inactivated its not able to cause harm to our body but it will s...

Answered by Georgia H. Biology tutor
1968 Views

What is Osmosis?

Osmosis is the diffusion of water molecules across a partially permeable membrane, from an area of high water concentration to an area of low water concentration. For exam if you're on the tube you will g...

Answered by Nasirdeen Y. Biology tutor
2229 Views

What is homeostasis?

Homeostasis is the body's ability to keep the body's internal environment at a condition of equilibrium, in response to any external changes. This includes body temperature, salt concentration, water conc...

Answered by Jaspreet G. Biology tutor
2271 Views

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