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Biology
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Why is oxygen needed in respiration?

In respiration, as you know the electrons travel through the electron transport chain and provide the energy to pump Hydrogen ions across the inner membrane. Once they reach the end of the chain, where do...

EJ
Answered by Emma J. Biology tutor
14403 Views

Describe three differences between a motor neurone and a sensory neurone.

A motor neurone has no or a very short dendron whereas a sensory neurone has a long dendron. A sensory neurone's cell body is found 'in the middle' of the neurone whereas a motor neurone's cell body is fo...

JD
Answered by Joshua D. Biology tutor
5905 Views

Define the term osmosis.

Osmosis is the net movement of water molecules from an area of high water potential to low water potential, commonly across a partially permeable membrane such as a cell's surface membrane.

JD
Answered by Joshua D. Biology tutor
2816 Views

How does electrical activity of the heart cause the heart to pump?

The sinoatrial (SA) node is a group of specialized cells which sit in the wall of the right atrium. The SA node sets the pace of your heart and is therefore called your pacemaker. SA node sets this pace b...

NE
Answered by Nithya E. Biology tutor
2677 Views

Describe the structure of DNA.

DNA is made of a string of nucleotide bases attached to one another by a peptide bond. A single nucleotide contains three regions: A phosphate group, a Carboxyl group and a base. Adjacent nucleotides atta...

BP
Answered by Bethan P. Biology tutor
10721 Views

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