1. a) What is a macromolecule?
carbohydrates
b) Give four examples of macromolecules. Nucleic acids.
2. Why is carbon a key element in macromolecules?
3. Give examples of functional groups and where they are found.
4. a) What is a polymer?
b) What is a monomer?
c) State macromolecules that form polymers.
d) State two processes that take place during polymerization and what they involve.
5. a) Derive concentration of water at room temperature, 25°C.
b) What is the concentration of hydrogen ions in 0.1M NaOH solution?
6. a) Define the following terms.
i.
Ph
ii.
Acid
iii.
Base
iv.
Strong acid
V.
Weak acid
vi.
Buffer
vii.
Buffer system
viii.
Derive Henderson-Hasselbalch equation.
b) Show that PKa=ph for a weak acid and then define PKa.
c) What is the ph of a mixture of 0.032M NaH2PO4 and 0.068M Na₂HPO4 (Dihydrogen
Phosphate Ka-1.38×10 M)?
d) Give the titration curves of acetic acid and aspartic acid against ph and KOH
concentration.
e) Explain 6 biological functions of proteins.
f) What are amino acids?
g) Explain the basic structure of amino acids using a well labelled diagram.
h) How many amino acids are used in making proteins?
i) Name the three groups under which amino acids are classified.
j) Classify amino acids based on the three structures above.
k) Draw the structure of each amino acid named above.
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