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Explain how DNA replicates inside a cell

DNA is made up of 4 bases (Adenine, Thymine, Guanine, Cytosine) Adenine, guanine = purine 'Pure AGony' Thymine and cytosine = pyramidines Adenine pairs with thymine (2 Hydrogen bonds - '2 people know where i...
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Answered by Claire D. • Biology tutor
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Describe the similarities and differences between simple diffusion, facilitated diffusion and active transport.

Simple diffusion, facilitated diffusion and active transport are three methods to transport various molecules across a membrane. Whilst similar in the overall effect, there are some major differences between...
JG
Answered by James G. • Biology tutor
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A neuron transmits an electrical impulse across a synapse in order to pass this impulse to the next neuron. Outline this process.

This is an example of a common process that must be known: Impulse reaches the synaptic bulb, causing calcium channels to open and calcium to enter. This causes synaptic vesicles to move towards the pre-syna...
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Answered by Matthew M. • Biology tutor
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Describe the blood flow through the heart

Venous blood enters the heart through the vena cava, it drains into the right atrium. The blood then flows through the tricuspid valve into the right ventricle. When the heart contracts the blood is ejected ...
AU
Answered by Alexandra U. • Biology tutor
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What are the steps involved in glycolysis and why does glycolysis occur?

Both aerobic and anaerobic respiration begin with glycolysis, which is the splitting of the 6 carbon glucose into 2, 3 carbon pyruvate molecules. This happens because glucose cannot be used directly by cells...
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Answered by Lara I. • Biology tutor
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