Ocr a level biology exam - Study guides, Class notes & Summaries

Abiotic components - correct answer Components of an ecosystem that are non living Abiotic factors - correct answer Non living components of an ecosystem that effect other living organisms Acetycholine - correct answer Chemical that acts as a transmitter that diffuses across synaptic cleft Acetycholinesterase - correct answer Enzyme in synaptic cleft that breaks down acetycholine. Aft...

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Abiotic components - Answer Components of an ecosystem that are non living Abiotic factors - Answer Non living components of an ecosystem that effect other living organisms Acetycholine - Answer Chemical that acts as a transmitter that diffuses across synaptic cleft Acetycholinesterase - Answer Enzyme in synaptic cleft that breaks down acetycholine. After it has triggered an action potential in the post synaptic neurone, acetycholine must be broken down otherwise it would remain in the sy...

What is a microscope? - Answer A microscope is an instrument which allows us to magnify an object thousands times larger, allowing us to see even unicellular organisms. When were the first light microscopes created? - Answer 16th and 17th centuries When was cell theory developed? - Answer The 19th century What did Cell Theory state? - Answer -Both plant and animal tissue is composed of cells -Cells are the basic unit of all life -Cells only develop from existing cells Why is light microsc...