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Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction.

The enzyme maltose will always fold into in a tertiary structure, which results in the active site being in a specific shape that only the substrate maltase can bind to. This is often illustrated using the a...
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Answered by Philippa S. • Biology tutor
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Describe how the rhythmicity of the heart is established and maintained with respect to the different stages in the cardiac cycle (6 marks)

The Sinoatrial Node (SAN) generates the wave of excitation/ Action potential (AP). The AP spreads across the atrial walls, stimulating the myocardial cells to contract This initiates the atrial systole. The ...
HM
Answered by Haider M. • Biology tutor
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Explain how the structure of RNA differs from that of DNA? (3 marks)

RNA is single-stranded, DNA is double-stranded. RNA contains the base Uracil, DNA contains thymine instead. RNA contains the sugar Ribose, DNA has Deoxyribose instead.
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Answered by Haider M. • Biology tutor
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What are the events in synaptic transmission?

The presynaptic action potential reaches the synaptic knob. 2) The terminal is depolarised. 3) Voltage gated calcium channels in the presynaptic knob open. 4) Calcium enters through the calcium channels. 5) ...
TD
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How does the Meselson and Stahl Experiment provide evidence for the semi conservative theory of DNA replication?

Before we start on the specifics of the experiment itself we need to understand how DNA replication occurs on a molecular level . DNA is made up of four different bases; A, C, G and T. Each base is attached ...
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Answered by Julia D. • Biology tutor
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