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Procedure 5.3 Biuret’s Test for Protein

Question 3:

a) Which contains more protein, egg albumen or honey?

b) Do free amino acids have peptide bonds?

c) What is a positive test for protein?

Lipids

Procedure 5.4 Sudan IV Test for Lipids

Question 4:

a) Is salad oil soluble in water?

b) Compare tubes 1 and 2.  What is the distribution of the dye with respect to the separated water and oil?

c) What observation indicates a positive test for lipid?

d) Does honey contain much lipid?

Question 5: Grease-spot test

a) Which food products that you tested contain large amounts of lipid?

Nucleic Acids

Diagram a nucleotide of DNA including the phosphate, pentose sugar, and nitrogenous base (5pts).

Exercise 5: Biologically Important Molecules cont.

Nucleic Acids cont.

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