AQA AS level Biology Exam Questions and Answers

AQA AS level Biology Exam Questions and
Answers

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Terms in this set (464)


Atoms share a pair of electrons in their outer shells,
Covalent bonding
forming a more stable compound, a molecule

Ions with opposite charges attract one another
Ionic bonding
forming a bond

In polar molecules, the negative region of one
polarised molecule and the positive region of another
Hydrogen bonding
attract each other forming a weak electrostatic bond
between the two

Polarised (a polar A molecule with uneven distribution of charge
molecule)

All chemical reactions that take place in living
Metabolism
organisms

Mole SI unit for measuring the amount of substance

Contains the same number of particles as there are in
One mole
12g of carbon-12 atoms



Avogadro's constant



Molar solution Contains one mole of a solute in each litre of solution

, Carbohydrates Molecules made up of carbon, hydrogen and oxygen

Organic molecule Molecules containing carbon

A small molecule that combines with other monomers
Monomer
to form polymers

Polymer A molecule made up of monomers

Monosaccharide A single monomer of a carbohydrate

Disaccharide A pair of monosaccharides joined together

Polysaccharides Many monosaccharides joined together



Monosaccharide general
formula



Glucose
Monosaccharides Galactose
Fructose



Alpha glucose




Beta glucose



A sugar that can donate electrons to another
Reducing sugar
chemical

Benedict's test Test for reducing sugars

Maltose Glucose-Glucose

Sucrose Glucose-Fructose

Lactose Glucose-Galactose