USABO
1) The physical separation of a eukaryotic cell during cell division is:
A. Mitosis.
B. Meiosis.
C. Binary fission.
D. Cytokinesis.
E. Synthetic fission. - ANS-D
2) Which of the following is TRUE about osmosis?
A. A solution of CaCl2 will have a lower water potential than a solution of NaCI with the
same concentration.
B. Isosmotic solutions can be hypotonic if the solute cannot pass through the cell
membrane freely.
C. Raising the temperature of a solution increases its water potential.
D. Smaller cells are more vulnerable to plasmolysis because they have a higher surface
area to volume ratio which lets more water leak out.
E. Water moves from higher to lower pressure and higher to lower solute concentration.
- ANS-D
3) Which of the following cell mechanisms are NOT considered as part of innate
immunity:
A. Phagocytes.
B. Mucous.
C. Interferons.
D. Lymphocytes.
E. Natural killer cells. - ANS-D
4) Polymerase chain reaction (PCR) Is an extremely common process that is used for
medical testing as well as biological research. This technology seeks to replicate and
amplify DNA. The thermostable polymerase most used in this process is:
A. Polynucleotide adenylyl transferase (Poly-A-polymerase).
B. Tag polymerase I.
C. E. Coli DNA polymerase I.
D. Terminal deoxynucleotidyl transferase.
E. Mouse DNA polymerase Il. - ANS-B
5) Which of the following chemical species does NOT function as a final electron
acceptor in either aerobic respiration, anaerobic respiration, or fermentation?
, A. Pyruvate.
B. Oxygen.
C. Acetaldehyde.
D. Lactate.
E. Sulfate. - ANS-D
6) Which of the following molecules is NOT directly formed by any of the steps of the
Citric Acid Cycle?
A. ATP.
B. CO2.
C. NADH.
D. FADH2.
E. Coenzyme A. - ANS-E
7) Which of the following statements is TRUE?
A. Amino acids found in regions of regular secondary structure always have phi bond
angles that are equal to their psi bond angles.
B. Disulfide bridges decrease the effective local concentration of amino acid residues
C. The amine group of a right-handed alpha-helix residue forms a hydrogen bond with
the carbonyl of the amino acid four residues earlier(later)
D. Each amino acid in a right-handed a-helix is hydrogen bonded to an amino acid
above and below it in the helix.
E. Every third amino acid residue in an a-helix is either proline or hydroxyproline. -
ANS-D
8) According to Levinthal's paradox, polypeptide chains can fold in almost an infinite
number of ways after they are translated. When polypeptide chains are translated, they
are almost uniquely folded into a single conformation. This is due to the presence of
which of the following:
A. Chaperonins.
B. Proteasomes.
C. Ribosomal interactions with polypeptide.
D. Ubiquitination.
E. Untranslated regions on the RNA. - ANS-A
9) Which of these atoms has a preferred oxidation number of -3?
A. Carbon.
B. Hydrogen.
C. Phosphorus
D. Calcium.
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