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What is photosynthesis?

Photosynthesis is the process by which light energy and carbon dioxide are utilised by plants to produce sugars like glucose. Through two reaction cycles, the light-independent and light-dependent reactions....
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Answered by Alexander G. • Biology tutor
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Explain two properties of water that are vital for aquatic life and explain how these arise

Ice floats on water as it is less dense- due to lattice structure of water molecules in ice. This insulates the water below the ice, preventing it from freezing to ensure marine life has suitable temperature...
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Answered by Amna A. • Biology tutor
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Vaccines have become an effective way to prevent certain diseases, however for some viruses it is difficult to develop a vaccine. Describe possible difficulties of developing a permanent vaccine for the influenza virus.

The influenza virus has a very high mutation rate. This means that its surface proteins (antigens) will change. Since a vaccine contains a specific antigen, if the virus switches to a different antigen, then...
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Answered by Nancy L. • Biology tutor
2995 Views

Explain the stages of the cardiac cycle

The cardiac cycle consists of series of chamber systole and diastole. Systole is the name given to a period when cardiac muscle contract to cause blood ejection from the respective chamber to another. Diasto...
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Give one piece of evidence that supports the theory that mitochondria evolved from prokaryotic cells. (1 mark)

Size: mitochondria are 2uM in diameter, similar to bacteria. Also applies to genome size and content, suggesting an 'endosymbiosis' event.
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Answered by Lauren M. • Biology tutor
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