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One of the most important roles of cell membranes is to control what substances enter and leave the cell. Describe the difference and a briefly outline the mechanism for passive and active transport of molecules over cell membranes.

Passive transport requires no energy and is dependent on concentration difference gradient of intra and extracellular spaces. Channel protein can be opened or closed to allow or stop the free flow of molecul...
AC
Answered by Aaron C. • Biology tutor
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How do I prepare for the HAT?

The HAT is not a paper to prove a universal understanding of all history but instead a chance to show how you can adapt fundamental skills of analysis to approach a topic that you will likely be unfamiliar o...
JB
Answered by James B. • HAT tutor
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Expand and simplify (3X+9)(X-6)=0

When expanding brackets, we need to make sure each of the terms in the first bracket are multiplied by all the terms in the second bracket (and vice versa). To make sure nothing is missed, we can used the FO...
WA
Answered by Wonu A. • Maths tutor
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Vous décrivez là où vous habitez pour votre blog (90 mots)

J'habite dans un petit village qui s'appelle Upper Dean. Il y a un parc, ou on peut jouer au foot. En general j'adore ma maison, c'est tres grand et je peux faire les activites avec mes freres. Mais pendant ...
JP
Answered by James P. • French tutor
3209 Views

Write about the ways Browning tells the story in 'My Last Duchess'.

'My Last Duchess' is written in the form of a first person narration, of an arrogant and callous Duke who tours an unknown guest around his gallery. The tone of the narration is aristocratic and detached. As...
JP
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