22851 questions

Describe the sequence of events of the clotting cascade that will lead to a blood clot in a damaged blood vessel

Thromboplastin is released from damaged tissue and platelets, which activates an enzyme that catalyses the conversation of the protein prothrombin to thrombin. This occurs in the presence of Calcium and Vitamin K. Thrombin is an enzyme that then catalyses the conversion of the soluble plasma protein, fibrinogen, into the insoluble protein, fibrin. The fibrin forms a mesh that traps more platelets and red blood cells to form a clot.
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Laura T.

Answered by Laura, who has applied to tutor Biology A Level with MyTutor

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Describe the sequence of events of the clotting cascade that will lead to a blood clot in a damaged blood vessel

Thromboplastin is released from damaged tissue and platelets, which activates an enzyme that catalyses the conversation of the protein prothrombin to thrombin. This occurs in the presence of Calcium and Vitamin K. Thrombin is an enzyme that then catalyses the conversion of the soluble plasma protein, fibrinogen, into the insoluble protein, fibrin. The fibrin forms a mesh that traps more platelets and red blood cells to form a clot.
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Laura T.

Answered by Laura, who has applied to tutor Biology A Level with MyTutor

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How is different an NFA from a DFA?

The difference between an NFA (non-deterministic finite state automaton) and a DFA (deterministic finite state automaton) is that while in the former we can have more than one transition with the same label from the same state, in the latter each label has only one transition associated with it.
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Michelangelo P.

Answered by Michelangelo, Computing A Level tutor with MyTutor

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What is the difference between a covalent and a ionic bond?

While in a covalent bond the atoms there are electrons which are shared between the atoms, the ionic bond is generated by the attraction of two particles of opposite sign.
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Michelangelo P.

Answered by Michelangelo, Chemistry A Level tutor with MyTutor

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What is the geometrical meaning of the derivative of a function?

Since the definition of derivative is the limit of the incremental rapport as h approaches 0 of ( f(x + h) - f(x) ) / h ), the geometrical meaning of a derivative is the slope of the tangent line in a general point (x, y) of the function (we assume the the function is sharp through all the points in its domain).
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Michelangelo P.

Answered by Michelangelo, Further Mathematics A Level tutor with MyTutor

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What's the difference between fixed and variable costs?

Fixed are costs that do not change with the level of output. For example, heating bills would be a fixed cost. Whether we make 100 computers or 300 computers, our fixed costs do not change. Variable costs are costs that do change with output, for example packaging. If we make 100 computers and our packaging costs are £5 per computer, the our packaging costs would be £500. This would then change if we were to make 300 computers as our cost is not £900.
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Will N.

Answered by Will, Business Studies GCSE tutor with MyTutor

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describe the structure of graphite

giant covalent structure
intralayer forceseach C atom joins to 3 other Cs by covalent bonds
interlayer forcesatoms form layers with a hexagonal arrangement between atomsweak interlayer forces
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Wesley Q.

Answered by Wesley, Chemistry A Level tutor with MyTutor

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what are the four ethical principles guiding medical treatment

autonomythe patient must have independence and choice over treatment
justicenew drugs/treatments should be fairly distributed between all members of society
beneficencea clinician should aim to improve the health of a patient
non-maleficencethe clinician must aim to do no harm to the patient
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Wesley Q.

Answered by Wesley, Medical School Preparation Mentoring tutor with MyTutor

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