4.1 Biological Molecules IGCSE biology

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Last updated: April 5, 2024

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Hint	Answer
chemical elements that make up carbs	oxygen, carbon and hydrogen
chemical elements that make up fats	oxygen, carbon and hydrogen
chemical elements that make up proteins	oxygen, carbon, nitrogen and hydrogen
molecules made from glucose	cellulose, glycogen and starch
proteins are made from	amino acids
molecules made from fatty acids and glycerol	fats and oils
biurrets test is for	proteins
positive result for biurets test	purple/lilac
negative result for biurets test	light blue
ethanol test is for	lipids
positive result for ethanol test	white emulsion
negative result for ethanol test	no white emulsion
test for starch	iodine test
positive result for the starch test	blue/black
negative result for the starch test	orange brown
benedicts test is for	glucose (reducing sugars)
positive result for benedicts test	green, yellow, orange and red percipitate
negative result for benedicts test	blue
DCPIP test is for	vitamin c
positive result for DCPIP test	colourless
negative result for DCPIP test	pink or blue
way to remember DCPIP	determined cats poo in pools
bases of DNA	A with T and C with G
how is it called when two strands are coiled together	double helix
what is the name of the chemicals that form the strtands	bases

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