IGCSE BIOLOGY BIOLOGICAL MOLECULES Exam Questions and Answers 100% Correct with complete solution

IGCSE BIOLOGY BIOLOGICAL MOLECULES
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1. what are carbohy- CHO (carbon, hydrogen and oxygen)
drates made from?

2. what are fats and oils CHO (carbon, hydrogen and oxygen)
made from?

3. what are proteins CHON (carbon, hydrogen, oxygen and nitrogen) but
made from? also SOMETIMES sulfur

4. what are the small- simple sugars
er molecules for
starch,glucose and
cellulose?

5. what are the small- fatty acids and glycerol
er molecules for fats
and oils?

6. what are the smaller Amino acids
molecules for protein
called?

7. what's the reducing add 2cm^3 of BENEDICTS REAGENT to 2cm^3 of
sugars test? UNKNOWN SOLUTION, and then heat up in boiling
water bath for 2-3 mins. if it's orange-brick red then
glucose is present.

8. what is the test for add a FEW DROPS OF IODINE into 2cm^3 of the
starch unknown solution, then gently shake mixture. if it's
deep blue/black then there is starch PRESENT.

9. what is the test for add a FEW DROPS OF BIURET REAGENT to 2cm^3
proteins of UNKNOWN SOLUTION and then gently shake
mixture. if it's mauve/purple then proteins are present

10. what is the test for add 2cm^3 of ETHANOL to the UNKNOWN SOLU-
lipids/fats (emulsion TION and gently shake mixture. pour mixture into
test) test tube that has EQUAL VOLUME OF DISTILLED
WATER. if there is a milky white emulsion formed then
lipids are present.
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