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If you’re first thought on reading this is panic. Don’t worry there are a clues to guide you to the answer. As with almost every problem the first step is to read the question carefully ...

The mitochondria is an organelle found in most cells of eukaryotic organisms, excluding some specific cells such as red blood cells. It has a double membrane and is variable in size (but usually betwee...

A mutation is a random change in the amount of DNA or sequence of DNA nucleotides within a cell. DNA is a double helix with two polynucl...

A gene is a section of DNA coding for a specific protein. This protein will perform a certain function within the organism. You interit two forms of each gene, one from each parent. These are ...

The cell membrane separates the intracellular and extracellular environments. The lipid bilayer only allows small polar molecules (such as O2 or CO2), small hydrophobic molecules (fatty acids, steroid hor...