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Biology
GCSE

Explain the differences between eukaryotic and prokaryotic organisms

There are four main differences; 1. DNA - Eukaryotes have linear DNA whereas prokaryotes have circular DNA. The DNA in eukaryotes is also protien bound, this is not the case in prokaryotes. 2. Organelles ...

Answered by Kate S. Biology tutor
3294 Views

Describe the structures of proteins

Primary structure - a sequence of amino acids in a polypeptide chain. They are joined together by peptide bonds. The sequence of amino acids determines the rest of the proteins structures. Secondary struc...

Answered by Phoebe M. Biology tutor
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Sickle-cell anaemia is an inherited condition caued by a dominant allele.

Sickle cell anaemia is a disorder of the blood caused by an inherited abnormal haemoglobin the abnormal h...

Answered by Mark S. Biology tutor
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1. Polydactyly is caused by a dominant allele, D. The recessive allele of the gene is represented by d. Use one genetic diagram to show the inheritance of the polydactyly gene by R and S.

P generation Father (P) Mother(Q)

Phenotype Polydactyly Normal

Genotype Dd dd

Gamete D d d d

Fertilization

Punnett Square for F1 generation

F/M

d

d<...

Answered by Suman C. Biology tutor
7116 Views

What causes a heart attack (also known as mycocardial infarction) and how are they treated?

During an individuals life arteries become covered in fatty plaque deposits. This causes the the inside (lumen) of the arteries to narrow. This narrowing increases the likelyhood of blockage of platelets ...

Answered by Saskia C. Biology tutor
2503 Views

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