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where does gas exchange occur in the lungs

gas exchange occurs in the alveolus of the lungs. Alveoli provide a good surface for gas exchange to take place.They provide a large surface area to volume ratio which increases the amount of gas that can be...
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Answered by Amelia G. • Biology tutor
6791 Views

What is eutrophication and how could it negatively impact plant life in rivers?

Eutrophication is the process whereby excess fertiliser is added to fields by farmers. This fertiliser contaisn nitrates which are very sioluble and so easily runs off into rivers and lakes. Plants use nitra...
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Answered by Rose H. • Biology tutor
2834 Views

Define osmosis

Osmosis is the free movement of water molecules across a partially permament member from high water potential to low water potential, down the water potential gradient, without the input of energy.
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Answered by Rose H. • Biology tutor
2830 Views

What is the difference between simple diffusion and active transport?

Simple diffusion is the movement of a molecules from an area of high concentration to an area of low concentration across a semipermeable membrane. Diffusion happens in liquids and gases as their particles m...
SK
Answered by Simi K. • Biology tutor
18914 Views

1.1 Write out the base sequence of the complimentary strand of DNA for the following DNA sequence (ATGGCTACG) (2 marks). 1.2 How many amino acids does the DNA sequence code for? (1 mark)

1.1 Answer: TACCGATGC (T is complimentary to A and C is complimentary to G)1.2 Answer: 3 amino acids (3 DNA bases code for 1 amino acid and there are 9 DNA bases in the sequence (9/3=3))
SL
Answered by Siobhan L. • Biology tutor
3198 Views