Top answers

What's the difference between the cell wall and cell membrane?

Cell wall: Only present in plant cells, it provides structure and is completely permeable to biological molecules. Cell membrane: Much thinner than cell wall and is present in all cells. It is selectively pe...
JD
Answered by Joel D. • Biology tutor
7829 Views

How can I use the PEAL chain to avoid waffling?

It can often be difficult when answering an essay question to clearly phrase your answer without losing sight of your main point and waffling. An incredibly helpful way of improving your writing style is to ...
HC
Answered by Hope C. • English tutor
5022 Views

In genetics, what does co-dominance mean?

Dominant alleles need the presence of only one copy to achieve expression. Recessive alleles need two copies to achieve expression. In Co-Dominance, both alleles are expressed at the same time. <o:p>&l...
MT
Answered by Michael T. • Biology tutor
5581 Views

How to differentiate using the Product Rule

The Product Rule is used when differentiating two functions that are being multiplied together. It can be used by multiplying each function by the derivative of the other and adding. If y=u v then dy/dx= u d...
CM
Answered by Callum M. • Maths tutor
5828 Views

What is the derivative of x^x

Firstly we should notice the similarities between this expression and expressions of the standard type a x. To deal with this type of expression, we take logarithms of both sides and then apply the usual rul...
DK
Answered by Daniel K. • Maths tutor
5718 Views