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What are the differences between diffusion, osmosis and active transport?

Diffusion is the net movement of particles in solution across a partially permeable membrane. The net movement of particles is from higher to lower concentration gradient. Osmosis is the net movement of wate...
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Answered by Thomas W. • Biology tutor
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Describe the conducting circuit in the heart

The heart is a muscular pump which pushes blood out to the body. It does this by contracting the muscle fibres which sqeezes the blood out. The heart has 4 chambers. Blood comes into the top two chambers, ca...
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Answered by Clodagh M. • Biology tutor
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What are the main differences between prokaryotic and eukaryotic cells?

I would say the main difference here is that eukaryotic cells (e.g. animal cells) have a nucleus and membrane-bound organelles, whereas prokaryotic cells (bacteria and archaea) have no nucleus and no membran...
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Answered by Sophie P. • Biology tutor
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Explain why the activity of amylase rapidly decreases above pH 7.

pH 7 is the optimum pH for amylase. This means it performs best and has maximum activity at this pH. Above pH 7, the activity of amylase rapidly decreases beacuse the concentration of H+ ions (or protons) is...
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Answered by Emilia R. • Biology tutor
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What might happen to the rate of glucose production as the temperature of a solution of sucrose and (human) sucrase was raised from 33°C to 43°C and why?

Sucrase is an enzyme that breaks sucrose down to its constituent monosaccharides – glucose and fructose. At 33°C the enzyme will not be working at its’ optimum, as it has evolved to work most efficiently at ...
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Answered by Miranda M. • Biology tutor
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