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Describe the mechanism of transport in the phloem, involving active loading at the source and removal at the sink.

The active transport of hydrogen ions out of the companion cells using ATP creates a hydrogen ion gradient.This causes the facilitated diffusion of H + ions back into companion cells. This occurs through a c...
JC
Answered by Jonathan C. • Biology tutor
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Write a balanced equation for the reaction of calcium hydroxide with nitric acid.

Ca(OH)2 + 2HNO3 --> Ca(NO3)2 + 2H2O
JC
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How far is the point (7,4,1) from the line that passes through the points (6,4,1) and (6,3,-1)?

To begin with, we should find the equation of the line. To do this we appoint a position vector and a direction vector. The position vector can simply be one of the two points we are give, i.e. (6,4,1). To f...
RH
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Construct expressions for pH, Kw and Gibbs Free energy

pH=-log[H+] Kw=[H+][OH-] GFE=enthalpy-(temp*entropy)
JD
Answered by Joe D. • Chemistry tutor
4904 Views

Describe the process of the reflex arc.

The reflex arc is activated to create a rapid response in order to maintain safety. It is an innate, automatic response to a dangerous stimulus. It involves 3 neurones. A sensory neurone, a motor neurone and...
RS
Answered by Ria S. • Biology tutor
15361 Views