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What are the four levels of protein structure? Please name and describe each level.

Primary - where amino acids are in the correct order in the polypeptide chain. Secondary - where small structures within the chain begin to form (including alpha helices and beta pleated sheets). Tertiary - ...
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Answered by Leah Y. • Biology tutor
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Regarding muscles and movement, what is the concept of the sliding filament mechanism?

Inside the sarcomere, the myosin filament and actin filament slide over eachother making the sarcomere shorter- at rest there is no cross bridge, actin and myosin are apart, ADP + Pi are bound to myosin- Pi ...
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Answered by Victoria T. • Biology tutor
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What is allostery and what are the differences between competitive and non competitive inhibitors?

Enzymes have an active site and allosteric sites. Allosteric sites regulate the activity of the enzyme.An allosteric enzyme could be- an allosteric activator which binds and stabilises the active form of the...
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Answered by Victoria T. • Biology tutor
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What is the difference between secondary and tertiary protein structure?

Secondary: localised folding within the polypeptide chain that is stabilised by hydrogen bonds. The most common secondary protein structures are alpha helices and beta sheets. Tertiary: this is the final for...
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Answered by Emma W. • Biology tutor
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How is insulin secretion controlled?

Beta cells in the pancreas contain potassium and calcium ion channels - potassium ion channels are normally open and calcium channels closed. When glucose concentrations outside of the cell are high the gluc...
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Answered by Bethany F. • Biology tutor
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