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Explain the lock and key model of enzyme action, including how they are denatured.

An enzyme is a protein that functions as a biological catalyst by speeding up chemical reactions and remaining unchanged by the reaction. The place on an enzyme where the molecule binds is called the active ...
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Answered by Lucy Erin S. • Biology tutor
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How does nervous input in a human cause increase cardiac output during exercise?

The nervous system can be divided into two branches-the parasympathetic branch and the sympathetic branch. The activity of the sympathetic nervous system is increased in response to exercise. This response t...
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Answered by Tamarind R. • Biology tutor
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Describe how a vaccine results in immunity.

Vaccine contains dead or altered/weakened form of the disease-causing pathogen, which contains a specific antigen . The antigen stimulates an immune response , leading to production of B lymphocytes . Activa...
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Answered by Dide O. • Biology tutor
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Describe the Process of DNA Replication

During DNA Replication, the existing molecule gets replicated, resulting in two semi-conservative DNA molecules. The enzyme helicase unwinds and unzips the double helix of the DNA, while topoisomerase moves ...
Answered by • Biology tutor
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a) What is the function of the atrioventricular valves? b) When the ventricles are contracting, are the arterioventricular valves open or closed? c) Explain why the muscle walls of the atria are thinner than the walls of the ventricles.

a) To prevent backflow of blood from the ventricles into the atria.b) Closedc) The atria only have to pump blood into the ventricles, where as the ventricles have to pump blood at a high pressure all the way...
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Answered by Catherine O. • Biology tutor
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