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What is a hormone and what do they do?

A hormone is a chemical messenger which travels in the blood. Hormones cause other tissues and organs to either produce other hormones or carry out chemical reactions. Water-soluble hormones cause this by bi...
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Answered by Amber D. • Biology tutor
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Could you help me to understand how DNA replication works?

In order to answer your question let's separate replication process into steps. Step 1: Unwinding of double-stranded DNA The first step of DNA replication involves binding of helicase enzyme that unwinds and...
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Answered by Raminta K. • Biology tutor
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Why do we use aseptic techniques in laboratories?

Aseptic techniques prevent the contamination of a sample from other bacteria or pathogens. It is important to do this to ensure that the sample we are dealing with remains pure. Microorganisms are in the env...
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Answered by Emma B. • Biology tutor
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What are the components and function of the autonomic nervous system in the human body?

There are 2 components, the sympathetic nervous system and the parasympathetic nervous system. They are a collection of nerves and neurotransmitters throughout the human body and present in both the central ...
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Answered by Pierce B. • Biology tutor
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What is osmosis and how does it differ from what I learned at GCSE about diffusion

At GCSE osmosis was simplified to just diffusion of water so it is the spreading out of water molecules from where there is a high concentration to a low concentration- but in fact osmosis depends both on th...
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Answered by Katie G. • Biology tutor
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