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How can I write a well structured essay.

The first step is to read the question carefully, understand the direction words (evaluate, compare) and highlight the key words in the question. At this point, you need to take an angle or create an argumen...
KD
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Explain osmosis and explain why this is an important concept in maintaining water potential in animal cells.

Osmosis is a passive process by which water achieves equilibrium through a semi-permeable membrane, moving down a concentration gradient. Water will move from where it is in high concentration (ie in a low s...
AP
Answered by Alana P. • Biology tutor
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Phosphorus(III) chloride molecules are pyramidal with a bond angle less than 109.5°. Explain why a phosphorus(III) chloride molecule has this shape and bond angle.

Phosphorous (III) Chloride consists of one phosphorous atom covalently linked to 3 individual chlorine atoms. Phosphorous is found in group 5 of the periodic table, hence it has 5 outer shell electrons, in w...
TD
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How does a chemical synapse transmit an action potential?

The action potential reaches the pre-synaptic knob causing depolarisation. This causes voltage-gated calcium channels in the pre-synaptic membrane to open. Calcium ions enter the pre-synaptic knob through th...
KB
Answered by Kathryn B. • Biology tutor
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show that f(x)=cos(x) is even and what is its graphical property

If the function is even, f(x) = f(-x).cos(-x) is the same value as cos(+x) therefore the function is even. Its graphical property is that it is symmetrical about the y axis as all even functions are.
MP
Answered by Matthew P. • Maths tutor
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