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Biology
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Explain what is meant when the genetic code is described as 'degenerate'.

DNA is made up of sequence of nucleotides ( a phosphate, a pentose sugar and nitrogenous base). It is the sequence of bases on the DNA strand that codes for proteins. A sequence of three bases is called a...

SB
14063 Views

How does a chemical synapse work?

Let's consider a synapse between an axon and a dendrite. To illustrate that an action potential is transmitted from the axon to the dendrite, the last portion of the axon, coming in contact with the dendr...

EA
3961 Views

What are enzymes and how do they work?

You might have heard enzymes referred to as 'biological catalysts'. This means, just like a catalyst you might add to a reaction in a chemistry practical, these proteins function to speed up reactions in ...

BD
Answered by Bethany D. Biology tutor
5697 Views

Describe how environmental factors affect the growth of roots and shoots in plants. (6 marks)

Plants are able to respond to the environment in multiple ways. Shoots grow upwards, towards light, in a process called phototropism. Roots, on the other hand, grow downwards into the earth towards moistu...

HL
Answered by Holly L. Biology tutor
4222 Views

How can I improve my exam technique?

A common problem amongst Biology students is the difficulty in knowing the content well, but not being able to translate this knowledge into marks when it comes to the exam. Your exam technique is vitally...

LD
Answered by Lucy D. Biology tutor
6783 Views

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