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Biology
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Explain a mechanism for the transporting and loading of sugars in the phloem. [6]

Relevant Points:Loading: loading into companion cells, location of companion cells at source(s), active loading of sucrose, mitochondrial action in companion cells, mechanism of proton gradi...

HM
Answered by Humail M. Biology tutor
3730 Views

Discuss the negative effects of smoking in the human body (6).

Smoking can cause carbon monoxide poisoning, meaning that carbon monoxide is carried in the blood via red blood cells instead of oxygen, leading to fatigue. Smoking can also cause lung cancer, as it conta...

SW
Answered by Samodani W. Biology tutor
2387 Views

Formation of an enzyme-substrate complex increases the rate of reaction, explain how.

The formation of an enzyme substrate complex reduces the activation energy required for the reaction to take place by bending bonds. Without an enzyme, very few reactions would have the energy to take pla...

Answered by Biology tutor
12133 Views

Describe how blood moves around the heart

De-oxygenated blood enters the right atrium from the Vena Cava, it then passes into the right ventricle due to gravity and the contraction of the walls of the right atrium. The walls of the right ventricl...

IL
Answered by Isobel L. Biology tutor
2563 Views

State and explain the principles of the Polymerase Chain Reaction (PCR)

Firstly, PCR is used to amplify DNA so that it can be used in analysis. It is particularly useful in processes like forensic science to identify DNA samples left behind at a crime scene. The process begin...

VP
2746 Views

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