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What are bacteria?

Bacteria are small living microorganisms that vary in shape and size. Similar to plants cells they contain a cell wall, however, they do not have a nucleus. Instead their genetic information is carried in etiher plasmids or chromosomal DNA.

Bacteria can rapidly reproduce without the aid of a host cell. This is unlike viruses that require a host cell to replicate within. Some bacteria also have flagella, these are tail-like structures that allow bacteria to become motile. 

They can cause damage to a host by releasing toxins this causes disease. Diseases that are caused by bacteria include, cholera, food poisoning and whooping cough.

Alessandra B. GCSE Human Biology tutor, A Level Human Biology tutor, ...

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Yasmin A.

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“Hello! I am a medical student at University College London.  All students have an individual learning style - this is why my teaching is tailored to you. With experience of tutoring students aged 6-19, I am confident in adapting my s...”

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“A little about me: After graduating with a BSc degree in Physiological Science (how the body works) I applied to study medicine as a graduate and am now studying to be a doctor at the University of Bristol.  I am fascinated by how th...”

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“Hi i'm Gemma, a second year student from a Russell Group University. I am studying Speech and Language Therapy and am ready to help you with Biology and English.”

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Alessandra B.

Degree: Dentistry (Other) - Kings, London University

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“Education: I completed my first degree in Medical Science at Exeter University, for which I graduated with a first class honours. As part of this, I completed a year in research and became a published author. I am now studying Dentist...”

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