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Ionic bond - this is an electrostatic force of attraction between two oppositely charged ions, i.e. a positively charged ion and a negatively charged ion. Covalent bond - this is a bond where electrons are s...

Scientists in labs use a technique called gel electrophoresis which allows them to separate a mix of DNA fragments by size . This is used in conjunction with PCR (polymerase chain reaction) and restriction d...

A virus is made of DNA wrapped in a coat made of protein. It is very small, typically nanometres across (one billionth of a metre). Viruses are different from bacteria as they are smaller and are not structu...

Molecules are very small, much smaller than we can see with our eyes. For this reason, we can’t simply just count the number of molecules in a sample by looking at it. Even if we could, there are so many mol...

One way in which you could structure an essay would be with a diamond structure. This is when your answer begins with your point (your argument- clearly established at the beginning of the essay) progresses ...