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Passive diffusion occurs without any transmembrane proteins being involved, the molecules cross the lipid bilayer following a concentration gradient (from the highest concentration to the lowest). Small u...

Producing a "chain of reasoning" in your answers is one of the more difficult requirements of the A level Economics syllabus. It is important when explaining your answers that you make clear and...

The relative formula mass (Mr) of a compound is the sum of the relative atomic masses of the atoms in the numbers shown in the formula.

Relative formula mass (Mr) of CaCO3 = 40+12+(3x16)=100.

Body temperature is regulated by a thermoregulatory centre in the brain, the hypothalamus. The hypothalamus can sense the temperature of the blood via receptors. The skin also contains temperature recepto...

There are two different methods of solving this equation and it is important to find the method that you find easiest.

The first method is to split up the numbers and the letters on both sides of t...