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EDEXCEL IAL BIOLOGY A LEVEL
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EDEXCEL IAL BIOLOGY A LEVEL
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EDEXCEL IAL BIOLOGY A LEVELpolarity of the atoms in a water molecule - Answers- Oxygen is more electronegative
than hydrogen which leads to polar bonds and an uneven charge distribution
Hydrogen bond - Answers- - type of strong intermolecular force
- hydrogen atoms which are directly covelantly bonded to a highly electronegative atom
(O, N or F) are attracted to highly electronegative atoms in other molecules
Solvent - Answers- substance in which solute dissolves to form solution
Properties of Water - Answers- • Acts as solvent
• Acts as metabolite
• High surface tension
• High specific heat capacity
• Strong cohesion and adhesion forces
Why is cohesion useful in biological systems - Answers- Cohesion is main force
supporting columns of water as they are pulled up the xylem in plants. water molecules
stick together as a constant column.
Why is adhesion useful in biological systems - Answers- It allows water to move against
the pull of gravity up the xylem.
Carbohydrates - Answers- Molecules consisting of carbon, hydrogen and oxygen only
Monosaccharide - Answers- 1 individual monomeric sugar unit
Disaccharide - Answers-
Two monosaccharides covelantly linked by a glycosidic bond
Polysaccharide - Answers- Polymer made of many monosaccharides covelantly linked
by glycosidic bonds
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