Aqa A Level Biology Updated Actual Exam Questions And Correct Answers.

AQA A LEVEL BIOLOGY UPDATED
ACTUAL EXAM QUESTIONS AND CORRECT
ANSWERS

●● 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