O LevelBiologyCambridgeExam Questions4. Biological Molecules4.1 Biological Molecules

Biological Molecules (Cambridge O Level Biology)

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4.1 Biological Molecules

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4.1 Biological Molecules

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1
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Which row shows the three main elements from the Period Table that are present in most molecules in living organisms?

A carbon oxygen nitrogen
B hydrogen carbon oxygen
C oxygen sulfur carbon
D hydrogen carbon nitrogen

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    2
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    The drawing shows a food test being carried out in a laboratory.


    HdWe4kL0_4-1-q4e---mcq

    Which food test is being shown and which food group is being tested for?

    • Biuret test for proteins

    • DCPIP test for Vitamin C

    • Benedict's test for reducing sugars

    • Emulsion test for fats

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    3
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    Which row represents the three main constituents of a DNA nucleotide?

    A  bases  phosphate  nucleus
    B  deoxyribose sugar  nucleus  chromosome
    C  bases  deoxyribose sugar  phosphate
    D  phosphate  chromosome  bases

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      11 mark

      Large biological molecules are made from smaller molecules. 

      Which row shows the correct molecules?

        starch  protein lipid DNA
      A fatty acids and
      glycerol      		 nucleotides glucose amino acids
      B glucose fatty acids and
      glycerol      		 nucleotides amino acids
      C nucleotides amino acids fatty acids and
      glycerol      		 glucose
      D glucose amino acids fatty acids and
      glycerol      		 nucleotides

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        1
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        The table below shows the elements and basic units used by cells to make large biological molecules. 

         

        basic units

        elements

        large molecule

        A

        amino acid

        carbon, hydrogen, oxygen, nitrogen

        protein

        B

        glycerol

        carbon, hydrogen, oxygen, nitrogen

        fats

        C

        glycerol

        carbon, hydrogen, nitrogen

        fats

        D

        amino acid

        carbon, hydrogen, oxygen

        DNA

        Which row of the table is correct?

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