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Describe the mechanism by which antibiotic resistance develops in bacteria?

Within a population of bacteria, one bacterium undergoes a random mutation in it’s DNA resulting it it having antibiotic resistance. The chance of this mutation happening can be increased by the overuse of a...
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Answered by Megan C. • Science tutor
2145 Views

Why would the mass of a piece of potato change when it is placed in different sugar solutions?

It's all due to a process called osmosis and the movement of water from a high water potential to a place of low water potential, passing through a partially permeable membrane. So what does this mean? If yo...
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Answered by Joanna G. • Biology tutor
82429 Views

Expand 4x(x+2)

For this type of question, we always simply take the term outside the bracket and multiply it with the terms inside the bracket sequentially. So, first we evaluate 4x * x, which gives us 4x 2 . Next, we eval...
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Answered by Callum C. • Maths tutor
6593 Views

3kg of oranges cost £54. 5kg of apples cost £60. Nina buys 2kg of oranges and 7kg of apples. How much does Nina Pay

First lets start with calculating how much 2kg of oranges cost (we do this by cross multiplying):so if 3kg = £54 2kg = £xto determine the value of x, we can write the following equation:3x = 54 23x = 108x = ...
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Answered by Aditi B. • Maths tutor
4571 Views

How would I answer the question "to what extent was King Louis XVI to blame for the start of the French Revolution?"

Firstly when faced with a question asking 'to what extent' we know that we need to prioritise and compare different elements in our answer. This question also asks for the causes leading up to the French Rev...
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Answered by Philippa N. • History tutor
4180 Views