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Describe the similarities and differences between the structure of ATP and a DNA nucleotide

Similarities Both have 5 Carbon sugar - pentose Both contain a phosphate Both contain adenine Differences DNA has a deoxyribose sugar whereas ATP has a ribose sugar DNA can involve all four bases, ATP only a...
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Answered by Abdul R. • Biology tutor
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I'm confused about the difference between active and passive immunity

Active immunity occurs when an individual develops immunity against a specific antigen when they are exposed to it - your body reacts by producing memory cells that provide long lasting immunity against that...
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Answered by Sophie P. • Biology tutor
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What's the difference between an antigen and an antibody?

An antigen is a substance that is introduced to the body and stimulates an immune response and the production of antibodies. Antibodies are proteins produced by cells in the body in in repsonse to the presen...
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Answered by Sophie P. • Biology tutor
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Explain the process that occurs in neuromuscular junctions from when the action potential in the pre-synaptic knob to transmission in the next neurone (6 marks).

The action potential in the pre-synaptic neurone causes calcium ion channels to open This causes calcium ions to diffuse into the neurone, down its concentration gradient This causes vesicles containing acet...
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Answered by Holly E. • Biology tutor
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Describe the process of osmosis

Osmosis is the movement of water molecules from a high partial pressure (or concentration) to a low partial pressure (or concentration) down a partial pressure (concentration) gradient. For example, think of...
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Answered by Alisha F. • Biology tutor
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