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What is the structure of a biological cell membrane?

The cell membrane is arranged into a polar structure known as a "phospholipid bilayer" which is made up of many phospholipids. The phospholipid has a hydrophilic (water loving) head and two hydroph...
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Explain the Bohr Effect?

CO 2 from respiring tissues diffuses into erythrocytes (red blood cells) where it reacts with water to form carbonic acid (process catalysed by the enzyme carbonic anhydrase). The carbonic acid dissociates i...
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Answered by Theresa E. • Biology tutor
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Describe the secondary and tertiary structure of a protein

The secondary structure of a protein refers to the folding or coiling of a protein. There are 2 main secondary structures. 1) alpha helix – this is held by hydrogen bonds and forms a coiled spring shape (lik...
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Answered by Megan L. • Biology tutor
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Explain how the heart muscle and the heart valves maintain a one-way flow of blood from the left atrium to the aorta

The left atrium has a higher pressure than the left ventricle due to the atrium filling with blood and contractingThis causes the atrioventricular valves (the mitral/bicuspid valve in the left side of the he...
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Why does a myelinated neurone have a faster conduction time than unmyelinated neurones?

Myelination allows saltatory conduction to occur, which is when the impulse 'jumps' along the axon using the nodes of Ranvier. The myelin also acts as an electrical insulator.
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Answered by Sasha H. • Biology tutor
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