Biochemistry Mid - I, September - 2014

1.How many ATP equivalents per mole of glucose are required for gluconeogenesis?
  • 2
  • 6
  • 8
  • None
Answer: B
2.How many hydrogen bonds can a water molecule potentially take in liquid form?
  • One
  • two
  • three
  • four
Answer: D
3.A biological redox reaction always involves
  • An oxidizing agent
  • A reducing agent
  • a gain of electrons
  • all of these
Answer: D
4.Molecules in which atoms are held together by _________ bonds have the strongest chemical linkages.
  • Noncovalent
  • Ionic
  • Covalent
  • hydrogen
Answer: C
5.The cells that depend solely on glucose as energy source are
  • Muscle cells
  • Brain cells
  • liver cells
  • kidney cells
Answer: B
6.The dissociation constant of H2O at 250C is
  • 10-14M
  • 1014 M
  • 10-7M
  • 107M
Answer: A
7.Amino acids required in the human diet and not synthesized by the body are
  • specialized
  • essential
  • trace
  • accessory
Answer: B
8.Weak acids generally have pKa
  • Values less than 1
  • That cannot be used to buffer
  • pKa values greater than 2
  • Values equal to 0
Answer: C
9.The production or breakdown of _______ is coupled with metabolic reactions of biosynthesis and catabolism.
  • Aspirin
  • CO2
  • DNA
  • ATP
Answer: D
10.Which molecule has the largest dipole moment?
  • HCl
  • H2S
  • CCl4
  • CO2
Answer: A
11.Molecules that bear charged groups of opposite polarity are known as _______________.
Answer: Zwitterions
12.Cellulose fibres resemble with the protein structure in the form _________ .
Answer:  - sheets
13._________ inhibits gluconeogenesis and stimulates glycolysis.
Answer: Insulin
14.The free amino group and free carboxyl group at opposite ends of a peptide chain are called as __________.
Answer: N and C terminus
15.A _______ is an enzyme that uses ATP to add a phosphate group to the substrate.
Answer: Kinase
16.The Henderson-Hasselbach equation is ______________.
Answer:
17._________________ most often stabilize the native structure of extracellular proteins.
Answer: Disulphide bonds
18.The conversion of pyruvate to oxaloacetate requires _____________.
Answer: Biotin
19.If the dielectric constant of a solution is lowered, the force of ionic interactions __________.
Answer: Increases
20.Most of the amino acids are chiral compounds because they have at least one carbon atom with ________ different groups attached.
Answer: Four