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The lock and key model: Only substrates of a specific shape that is complementary to the active site of an enzyme can fit into the active site, in a way that is analagous to a key fitting into a lock.

A hydrocarbon is a molecule that contains only hydrogen and carbon atoms. Any two of the follwing properties are suitable answers: Low boiling points, low viscosities or high flammability.

The problem is: ‘Tom travels from a to b and at a speed of 90km per hour. It takes him time ‘t’. Alice travels from a to b at a speed of 70km per hour. It takes her time ‘t+ 1 hour’. How long did it take for...

There is a simple way of making calculations with percentages. Say you want to subtract from a numerical value x,20%. Then multiply it with 80/100. Say you want to add 20%.Then multiply with 120/100. Say you...

Many students ask how they can they find 2 unknowns,given 2 simple equations. I'll try to focus in this answer on giving students a tool which they can use to solve ANY 2 simple equations with one solution.L...