Biological molecules-OCR - A level

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Last updated: January 27, 2021

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First submitted	January 26, 2021
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Hint	Answer
what property of water enables it to act as a coolant?	high latent heat of vaporisation
what property of water enables it to transport substances and act as a good medium for chemical reactions?	solvent
which property of water makes it thermally stable?	high specific heat capacity
what are the intermolecular forces present between water molecules?	hydrogen bonds
alpha and beta glucose, ribose, deoxyribose, fructose and what is the last monosaccharide?	galactose
in which type of glucose is the hydroxyl group on the top?	beta
fructose, galactose, beta & alpha glucose are all examples of what type of sugar?	hexose
what is the chemical formula of deoxyribose?	C5H10O4
what bond joins monosaccharides?	glycosidic
what is the name of two alpha glucose molecules bonded together?	maltose
what is the name of 3 or more monosaccharides bonded together?	polysaccharide

Hint	Answer
what property of starch and glycogen means they do not affect water potential?	insoluble
name the two polysaccharides that make up starch	amylose and amylopectin/amylopectin and amylose
amylopectin is a branched structure with 1,4 and ....... glycosidic bonds	1,6
which polysaccharide provide animals glucose quickly?	glycogen
cellulose is composed of what type monosaccharide?	beta glucose
cellulose chains bundle to form microfibrils, microfibrils bundle together to form...	macrofibrils
what is a lipid made up of?	3 fatty acids and a glycerol
if a lipid has 4 double bonds it can be described as....	polyunsaturated
what reaction turns a lipid back into its constitute molecules?	hydrolysis
which lipid would be more fluid? A.) polyunsaturated or B.) saturated	A

Hint	Answer
what bond is present between the fatty acids and glycerol?	ester
what role do lipids have surrounding vital organs such as the heart and kidneys?	protection/shock absorber
which of the following are present in an amino acid (assuming R group is hydrogen)? aldehyde , halogen, acid amide group, carbonate or carboxyl group	carboxyl group
what bonds form between amino acids?	peptide
name the two types of secondary structure that the polypeptide chain can fold into	beta pleated sheet and alpha helix
what is the primary structure of a protein?	the sequence of amino acids/order of amino acids
haemoglobin has how many polypeptide chains?	4
name a protein that consists of just one polypeptide chain	pepsin
in chromatography what is defined as where the molecules can move?	mobile phase
what is chromatography used to separate a mixture based on?	solubility

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