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What is diffusion and what effects the rate at which it occurs?

Diffusion is the movement of particles from an area of high concentration to an area of low concentration (with the gradient). Once the concentration in each area is equal, the overall diffusion rate is 0. W...
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Answered by Lucie C. • Biology tutor
22602 Views

What is mRNA?

mRNA is one of the 3 types of RNA: the others being tRNA and rRNA. They all play a role in protein synthesis. mRNA stands for messenger ribonucleic acid. It is made by copying a strand of DNA called the temp...
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Answered by Lucie C. • Biology tutor
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Where do I start with poetic close analysis?

The tool that revolutionised the way I learned for A-Level English is one I wish I'd learned earlier. First of all, try to put all pre-conceptions you have of the piece aside. These are useful once you've bu...
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Answered by Sarah H. • English tutor
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What are the different types of transport across a membrane?

The different types of transport across a membrane can be divided into two main categories: active and passive transport. Active transport requires metabolic energy in the form of ATP and molecules are moved...
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Answered by Steph F. • Biology tutor
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How to factorise a quadratic with a coefficient of x^2 greater than one, for example 4x2+4x-15?

Firstly, label each coefficient: coefficient in front of x2 “a”, is equal to 4. “b” is the coefficient in front of x is equal to +4 “c” is equal to -15 The procedure for factorising starts with working out t...
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Answered by Bhavin S. • Maths tutor
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