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DNA is found in the nucleus of all human cells (except red blood cells). Its double-stranded, helical structure contains all of the information required for the body to produce new proteins- it simply nee...

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 ...

This is a topic which is common across all A-Level specifications, the questions surrounding this topic may vary from labelling diagrams, matching features in a table, or longer written styles of question...

The main component of primary protein structure is that it is composed of amino acids. 

The amino acids are connected via covalent chemical bonds more specifically called the peptide bond.

A...

The vaccine contains a weakened or inactivated form of the virus. The viral particle displays an antigen on its surface specific to poliovirus. Once in the blood, a specific helper T cell will detect the ...