AQA AS BIOLOGY COMPREHENSIVE TEST
PAPER QUESTIONS AND ANSWERS
VERIFIED GRADED A+
●● condensation reaction
Answer: a chemical reaction in which two or more molecules join and
produces one water molecule
●● hydrolysis reaction
Answer: A chemical reaction that breaks apart a larger molecule by
adding a molecule of water
●● isomers
Answer: Compounds with the same chemical formulae but different
structures.
●● carbohydrates
Answer: compounds made from carbon, hydrogen and oxygen
(monosaccharides, disaccharides and polysaccharides), important energy
store
●● monosaccharide
Answer: simple sugars (glucose, fructose, galactose)
,●● disaccharide
Answer: two monosaccharides joined together by a glycosidic bond
●● polysaccharide
Answer: many sugar units joined by a glycosidic bond
●● maltose
Answer: α glucose + α glucose
●● lactose
Answer: glucose + galactose
●● sucrose
Answer: glucose + fructose
●● where is lactose found?
Answer: milk
●● where is maltose found?
Answer: germinating seeds
, ●● where is sucrose found?
Answer: table sugar
●● cellulose
Answer: polymer of β glucose
●● starch
Answer: polymer of α glucose (amylose + amylopectin)
●● what is the structure of cellulose?
Answer: long, unbranched chains of β glucose, insoluble
●● where is cellulose found?
Answer: plant cell walls
●● why is cellulose strong?
Answer: chains linked by h bonds form microfibrils giving high tensile
strength to prevent osmotic lysis
●● what is the structure of starch?
Answer: long, highly-branched, compact helix and insluble
PAPER QUESTIONS AND ANSWERS
VERIFIED GRADED A+
●● condensation reaction
Answer: a chemical reaction in which two or more molecules join and
produces one water molecule
●● hydrolysis reaction
Answer: A chemical reaction that breaks apart a larger molecule by
adding a molecule of water
●● isomers
Answer: Compounds with the same chemical formulae but different
structures.
●● carbohydrates
Answer: compounds made from carbon, hydrogen and oxygen
(monosaccharides, disaccharides and polysaccharides), important energy
store
●● monosaccharide
Answer: simple sugars (glucose, fructose, galactose)
,●● disaccharide
Answer: two monosaccharides joined together by a glycosidic bond
●● polysaccharide
Answer: many sugar units joined by a glycosidic bond
●● maltose
Answer: α glucose + α glucose
●● lactose
Answer: glucose + galactose
●● sucrose
Answer: glucose + fructose
●● where is lactose found?
Answer: milk
●● where is maltose found?
Answer: germinating seeds
, ●● where is sucrose found?
Answer: table sugar
●● cellulose
Answer: polymer of β glucose
●● starch
Answer: polymer of α glucose (amylose + amylopectin)
●● what is the structure of cellulose?
Answer: long, unbranched chains of β glucose, insoluble
●● where is cellulose found?
Answer: plant cell walls
●● why is cellulose strong?
Answer: chains linked by h bonds form microfibrils giving high tensile
strength to prevent osmotic lysis
●● what is the structure of starch?
Answer: long, highly-branched, compact helix and insluble
