, TOPIC 1- A LEVEL EDEXCEL BIOLOGY
B EXAM QUESTIONS AND ANSWERS
100% CORRECT!
monosaccharides - ANSWER single simple sugar molecule
disaccharides - ANSWER sugar made up off two monosaccharide units joined by a
glycosidic bond formed in a condensation reaction
polysaccharides - ANSWER polymer made up of long chains of monosaccharide units
joined by glycosidic bonds
condensation reaction - ANSWER reaction in which a molecule of water is removed
from the reacting molecules as a bond is formed between them
glycosidic bond - ANSWER covalent bond formed in a condensation reaction
anion - ANSWER negative ion formed when an atom gains an electron
cation - ANSWER positive ion formed when an atom loses an electron
ionic bonds - ANSWER attractive forces between oppositely charged ions
covalent bonds - ANSWER formed when atoms share electrons
dipole - ANSWER separation of charge in a molecule when the electrons in a covalent
bond are not evenly shared
polar molecule - ANSWER molecule containing a dipole
hydrogen bonds - ANSWER weak electrostatic intermolecular bonds formed between
polar molecules containing at least one hydrogen atom
monomer - ANSWER small molecule that is a single unit of a larger molecule called a
polymer
B EXAM QUESTIONS AND ANSWERS
100% CORRECT!
monosaccharides - ANSWER single simple sugar molecule
disaccharides - ANSWER sugar made up off two monosaccharide units joined by a
glycosidic bond formed in a condensation reaction
polysaccharides - ANSWER polymer made up of long chains of monosaccharide units
joined by glycosidic bonds
condensation reaction - ANSWER reaction in which a molecule of water is removed
from the reacting molecules as a bond is formed between them
glycosidic bond - ANSWER covalent bond formed in a condensation reaction
anion - ANSWER negative ion formed when an atom gains an electron
cation - ANSWER positive ion formed when an atom loses an electron
ionic bonds - ANSWER attractive forces between oppositely charged ions
covalent bonds - ANSWER formed when atoms share electrons
dipole - ANSWER separation of charge in a molecule when the electrons in a covalent
bond are not evenly shared
polar molecule - ANSWER molecule containing a dipole
hydrogen bonds - ANSWER weak electrostatic intermolecular bonds formed between
polar molecules containing at least one hydrogen atom
monomer - ANSWER small molecule that is a single unit of a larger molecule called a
polymer
