Top answers

Biology
A Level

Explain why maltose can only be broken down by the enzyme maltase.

The active site of an enzyme is complementary (meaning, it fits perfectly) to a substrate (in this can the substrate being maltose). Once the maltose and maltase combine to form the enzyme-substrate compl...

BP
Answered by Bradley P. Biology tutor
9070 Views

How does DNA replication occur?

DNA normally exists in the cell as a double-stranded structure, comprising of two complementary strands that are held together by hydrogen bonds.

DNA replication involves two main steps. Firstly, t...

KH
Answered by Katharine H. Biology tutor
11552 Views

What is competitive inhibition in enzymes?

competitive inhibition occurs when the active site of the enzyme is complementary to the binding site of the inhibitor and so binds to form a complex. The inhibitor molecule therefore occupies the active ...

ST
Answered by Sophie T. Biology tutor
2818 Views

Describe how an action potential is carried across a synapse between to neurons.

Once the action potential reaches the pre-synaptic bulb, the change in membrane potential triggers the opening of voltage-gated calcium channels to allow calcium to enter the cell. The influx of calcium t...

SA
Answered by Sam A. Biology tutor
3148 Views

Explain the concept of natural selection. Give an example.

Natural selection is a theory that became popular after Charles Darwin work and states that traits of living organisms are selected according to their ability to adapt to the environment. It implies that ...

JF
Answered by Jessica F. Biology tutor
2864 Views

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