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biological molecules (PAG) Cell level systems Biology GCSE Questions and Answers
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biological molecules (PAG) Cell level systems Biology GCSE Questions and Answers
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biological molecules (PAG) Cell levelsystems Biology GCSE Questions and
Answers
Qualitative reagent - Answer-A substance used in chemical analysis to test for the
presence of specific molecules
Qualitative - Answer-Relates to measuring the quality of something rather than its
quantity
Benedict's reagent - Answer-When heated will turn from blue to a brick-red precipitate in
the presence of reducing sugars
Results for Benedict's reagent - Answer-The solution will change from blue to green to
yellow to brick-red depending on the level of reducing sugars present
Biuret reagent - Answer-Turns from blue to purple in the presence of proteins
Iodine test - Answer-Turns from orange to blue-black in the presence of starch
Ethanol and water - Answer-When shaken will turn from colourless to a milky-white
emulsion in the presence of lipids
Sudan III - Answer-When shaken will turn from brick-red to a red-stained oil layer in the
presence of lipids
Carbohydrates - Answer-Provide energy for chemical reactions and can break down
into sugars
Reducing sugars - Answer-A sugar such as glucose or fructose that can act as a
reducing agent
Lipids - Answer-An energy store of fats and oils that can break down into glycerol and
fatty acids
Proteins - Answer-The building blocks of cells and tissues that can break down into
amino acids
Precipitate - Answer-Deposits of solid in a solution
Mortar and pestle - Answer-Devices used for crushing and grinding up food substances
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