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Biology
A Level

Give two similarities and two differences between the structure of starch and cellulose polysaccharides (4 marks).

Similarities (up to 2 marks, 1 mark each): Both linked by glucose monomers. Monosaccharides are linked by 1,4 glycosidic bonds. Monosaccharides are joined together via condensation reactions. Both polysac...

Answered by Jacob D. Biology tutor
50310 Views

Describe the structure of DNA in the eukaryotic cell

DNA is a double stranded helix. Each strand is held together by complementary base pairs or nucleotides. A nucleotide consists of a base, a deoxyribose sugar and a phosphate. The bases are A, T, C and G. ...

Answered by Megan L. Biology tutor
11052 Views

What is the difference between conservation and preservation regarding species

Although they both promote sustainability:
Conservation is the human involvement in attempts to protect wildlife. Usually with endangered species where they can be tracked and looked...

Answered by Aadil C. Biology tutor
7045 Views

Describe what is meant by the 'lock and key' theory.

When binding two things together in biology, such as an enzyme and a substrate, in order to fit together they musth ave a specific shape. The shape of the enzyme active site must be the reciprocal to the ...

Answered by Lily W. Biology tutor
4148 Views

Describe the steps of mitosis

Mitosis is one of the two types of cell division which leads to the production of two genetically identical diploid daughter cells (2n) from one original diploid parent cell (2n). The steps of mitosis are...

Answered by Luke R. Biology tutor
4888 Views

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