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Firstly, the enzyme DNA helicase separates the two strands in DNA by breaking the hydrogen bonds between them. Both of the two strands then act as templates to which free nucleotides attach to. This attac...

A reflex action is the bodies automatic and rapid response to a stimulus which we carry out without thinking. Due to it being a rapid response it doesn't involve the brain and follows a path called the re...

Cohesion is the attraction of molecules of the same type.Water is cohesive because it is dipolar therefore the positive electrons from the 2 hydrogens are pulled towards the oxygen end making the oxygen e...

Solvents are substances that can dissolve other substances.Water can act as a solvent for ions (charged particles/molecules) because it is dipolar (the positive electrons from the 2x hydrogen are pulled t...

Fish gills are made up of thin plates called gill filaments, which are covered in structures called lamallae. Both the gill filaments and lamellae provide a...