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What role do calcium ions play in contraction of the sarcomere? (4 marks)

When an action potential arrives at the motor end plate it causes depolarisation to occur in the sarcolemma of the effector muscle cells.2) Depolarisation spreads via T-tubules to the sarcoplasmic reticulum ...
BW
Answered by Ben W. • Biology tutor
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MRSA and C. difficile are resistant bacterial strains which cause life-threatening infections in hospitals. Explain how MRSA/ C. difficile could arise from non-resistant bacteria. [6 marks]

Natural SelectionCompetition for survival between bacterial colonies/ Selection pressure is survivalVariation between colonies linking to phenotype of resistanceSpontaneous mutation produces antibiotic resis...
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Answered by Ijaz C. • Biology tutor
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What is osmosis?

Osmosis is the passive diffusion of water, which therefore, doesn't require any energy to occur. Typically water will move from an area of high concentration to an area of low concentration across a semi-per...
MW
Answered by Matthew W. • Biology tutor
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Name the key differences between Eukaryotic and Prokaryotic cells?

Eukaryotic cells are typically belonging to multicellular organisms, with exceptions of algae and amoebae. These cells always have multiple linear chromosomes (genetic material) and contain a nucleus (housin...
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Answered by Matthew W. • Biology tutor
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how might a competitive inhibitor prevent the enzyme trypsin from working

inhibitor is a similar shape to the substrate this means the inhibitor blocks the active site of the enzyme the substrate cannot bind to the active site, so fewer enzyme substrate complexes can form
Answered by • Biology tutor
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