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Explain the need for neuronal communication over chemical signalling or passive electrical signalling

Neurons are required to send messages at high speeds over long distances. For example, reflex reactions occur in the order of fractions of seconds, and some neurons carry messages over 1m in distance.Accordi...
RF
Answered by Rose F. • Biology tutor
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A curve is defined by the equation y = (x + 3)(x – 4). Find the coordinates of the turning point of the curve.

The turning point of a curve is the point at which it will turn, therefore, either the maximum or minimum point. Firstly, you need to expand out the brackets so the equation looks like a standard curve equat...
CM
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0.15^2 x (1-0.15)^3 to 2 s.f

BIDMASFirst must donwhat is inside the brackets1-0.15 = 0.85Next must do the indices 0.85^3= 0.6141250.15^2 =0.0225Then multiply0.0225 x 0.614125 = 0.01381781shorten to 2 s.f0.014
FM
Answered by Francesca M. • Maths tutor
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Why is the bond angle in an amide ion smaller than the bond angle in a molecule of ammonia?

The nitrogen atom in both NH 3 and NH 2 - has 8 outer shell electrons. In NH 3 , 3 pairs of these electrons are used in covalent bonding to hydrogen atoms and the remaining 2 electrons exist as a lone pair. ...
AG
Answered by Anna G. • Chemistry tutor
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The population of a town in 2014 was 80058. This was a 65% increase on its population in 1994. What was the population in 1994?

Firstly, look at what the question is asking you to find out. You need to work out the population from 1994. You are told that there was an increase from 1994 to 2014. Therefore you can take the population i...
CM
Answered by Clare M. • Maths tutor
4415 Views