Top answers

What is the difference between cells, tissues, organs and organ systems?

You can think of these 4 things as a hierarchy, where each 'element' is a building block for the next level. The smallest 'unit' are cells . There are trillions of cells in your body and these cells together...
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Answered by Callum G. • Biology tutor
81224 Views

What is the difference between an artery and a vein?

Arteries and veins both carry blood around the body, and they each have three main layers of tissue (a ring of endothelial tissue at the centre of the blood vessel surrounded by a layer of muscle and elastic...
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Answered by Emily W. • Biology tutor
180665 Views

What are the functional differences between RNA and DNA

DNA is the medium which encodes the information that makes an organism what it is. DNA usually forms a double stranded structure and encodes genes and other regulatory elements. RNA can act as either catalys...
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Answered by Rosewan A. • Biology tutor
10017 Views

What are is the function of a ribosomes and what is it made from?

Ribosomes translate (read) messenger RNA to produce specific polypeptide chains (proteins). The Ribosome itself is made up rRNA which forms the structures which read the messenger RNA and add peptides to the...
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Answered by Rosewan A. • Biology tutor
9628 Views

How does a vaccine prevent infection?

When vaccine is given small amounts of the dead or inactive pathogen are inserted in to the blood, this activates the body's white blood cells which then produce antibodies. These antibodies destroy the dead...
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Answered by Rosie B. • Biology tutor
5183 Views