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Biology
A Level

Describe the process of Eutrophication.

Excess nitrates and phosphates are water soluble and enter rivers/lakes/waterway due to leaching.Algae in the water use the increased level of ions for growth. This is called Algal bloom.Build up of algae...

JU
Answered by Junaid U. Biology tutor
5099 Views

Genetic engineering can be used to modify the genome of an organism to express desirable characteristics. Outline the steps of producing a recombinant DNA molecule.

The steps are as follows:The desired gene is isolated by 'cutting' it out using a restriction enzyme. The same restriction enzyme is then used to 'cut' a vector (plasmid or virus). These can either be lef...

MZ
Answered by Marium Z. Biology tutor
2162 Views

How would you test a seed for lipids?

To test for presence of lipids, you use an emulsion test.First, crush the seen to release the contents.Next, add ethanol and shake.Then add water and shake again.If lipids are present in the seed, the mix...

CP
Answered by Caitlin P. Biology tutor
13325 Views

Describe the process of DNA replication in a Eukaryotic cell. (6 Marks)

Firstly, the double stranded helical structure of the DNA is unwound by an enzyme called DNA helicase. This process of separation requires the breaking of the hydrogen bonds which link the base pairs. Aft...

CO
Answered by Callum O. Biology tutor
2520 Views

Compare a eukaryotic cell with a prokaryotic cell

Both the eukaryotic and prokaryotic cells have a cell surface membrane and contain cytoplasm and ribosomes. However, eukaryotic cells contain membrane bound organelles, such as mitochondria, nuclei, endop...

RO
Answered by Rebecca O. Biology tutor
3095 Views

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