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Explain the process of DNA replication (6 marks).

The parental DNA is unwound from its double helix structure . DNA Helicase enzymes break hydrogen bonds between the bases of the parental DNA. DNA polymerase enzymes add free nucleotides to the daughter stra...
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Answered by Gerald H. • Biology tutor
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Describe how a simple Reflex works.

Reflexes allow you to respond to a stimuli (change in environment). A simple reflex begins with a receptor which are found in sense organs and allow you to detect the stimuli. An example of a sense organ is ...
MM
Answered by Mira M. • Biology tutor
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What is the function of the mitochondria?

Mitochondria are organelles which are present in all cells. They are the sites for cellular respiration which provides an organism with energy.
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A plant is moving mineral ions from the soil into its roots by the process of active transport. Does this suggest that the concentration of ions is higher in the soil or the roots?

The concentration is higher in the soil. The process of active transport is used to move molecules against the concentration gradient (from a low to a high concentration). Therefore the concentration of ions...
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Answered by Alice M. • Biology tutor
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What happens at the junction between neurons?

Neurons are the basic cells in the nervous system. They are made up of a soma, axon, dendrites and synapse. The synapse is the end part of the neuron that is in charge of sending a message from one neuron to...
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Answered by Sean D. • Biology tutor
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