Exam #1

1)     1) How is the alpha-helix stabilized?

a)      Hydrogen bonds between peptide bond carbonyl oxygens and amide hydrogens

b)      Disulphide bridges

c)       Hydrophobic interactions

d)      Electrostatic interactions between oppositely charged ions

e)      Hydrogen bonding between hydroxyl groups and water

2)     2) What does the term ‘epimer ‘ refer to?

a)      Presence of chirality

b)      Difference in configuration around 1 carbon atom

c)       A disease affecting carbohydrate metabolism

d)      An oligopeptide consisting of 3 sugars

e)      Presence of an achiral carbon atom

3)       3)What molecules is glycogen synthesized from?

a)      Alpha-D-glucose

b)      Beta-D-glucose

c)       Sucrose

d)      Fructose and glucose

e)      Amylopectin

4)     4) D-galactose and D-mannose are

a)      Epimers

b)      Enantiomers

c)       Isomers

d)      Anomers

e)      Ketose sugars

5)     5) Which of the following is a ketose sugar?

a)      Glyceraldehyde

b)      Fructose

c)       Glucose

d)      Galactose

e)      Mannose

6)      6)Which is most likely to affect the 3 –dimensional conformation of a protein?

a)      Insertion of proline amino acids

b)      Substitution of valine for leucine

c)       Dehydrogenation of carboxy terminal amino acid

d)      Oxidation of amino terminal amino acid

e)      Dynamic electron dispersal in bonds

 

 

7)     7) The presence of a non-competitive inhibitor

a) Increases both Vmax and Km

b) Decreases Km

c) Increases Km and decreases Vmax

d)Decreases both Vmax and Km

e) Decreases Vmax

 

8)     8) Km is equal to

a)      Numerically, the substrate concentration at which maximal velocity is half

b)      ½ Vmax

c)       –log pKa

d)      Enzyme concentration + substrate concentration

e)      Enzyme concentration/substrate concentration

9)      9)Which of the following is a prokaryote?

a)      Protists

b)      Fungi

c)       Plant

d)      Algae

e)      Bacteria

10)   Which is responsible for mobility?

a)      Fimbriae

b)      Golgi apparatus

c)       Lysosomes

d)      Flagella

e)      Smooth endoplasmic reticulum

 

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