BIOLOGY OF CELLS AND ORGANISMS ( BIOS 100 ) ACCURATE
ACTUAL EXAM WITH VERIFIED Q&A
1. What scientific hypotheses can be tested by a pulse-chase experiment?
A. Solubility of a molecule
B. The amino acid sequence of a protein
C. Movement of molecules through a cell over time
D. The steady-state level of protein in the cell
E. The central dogma of Biology
2. Plasmids contain
A. lipids
B. enzymes that degrade toxic substances
C. many ribosomes
D. DNA
E. microtubules
3. Evidence suggesting that mitochondria were once free-living cells that were engulfed by an
ancient eukaryotic cell includes
A. the presence of DNA within the mitochondria
B. the presence of double membranes of mitochondria
C. their ability to make the energy rich compound ATP
D. A & B
E. A, B & C
4. What central theme of biology helps explain why various cells can look so different from one
another?
A. All cells need to engage in energy transformations.
B. Information flow in a cell goes from DNA to RNA to protein
C. cell structure is tightly connected with cell function
D. Different cells contain different macromolecules as their genetic material.
E. The split between prokaryotic and eukaryotic cells defines this characteristic
5. What type of bond joins the monomers in a protein's primary structure?
A. hydrophobic
B. hydrogen bonds
C. disulfide bonds
D. peptide ponds
E. ionic bonds
, 6. α-helices form in a protein due to what kind of bond?
A. ionic
B. hydrogen bond
C. peptide bond
D. hydrophobic
E. alcoholic
7. Small changes in levels of acid could likely disrupt what kind of bond?
A. glycosidic
B. hydrogen bond
C. peptide bond
D. hydrophobic
E. alcoholic
8. Sickle-cell anemia results from
A. Inappropriate accelerated degradation of the protein hemoglobin
B. An alteration in the quaternary structure of hemoglobin
C. the substitution of a small nonpolar amino acid for a larger acidic amino acid
D. an inability to produce hemoglobin in sufficient amounts
E. B&C
9. In allosteric inhibition of an enzyme,
A. A molecule similar to the substrate binds to an enzyme far removed from the active site of
the enzyme.
B. A molecule similar to the substrate binds directly to the active site of the protein
C. A molecule with a shape dissimilar from the substrate binds to an enzyme far removed
from the active site of the enzyme.
D. A molecule with a shape dissimilar from the substrate binds to the active site of the enzyme.
E. Protein subunits fail to get together to form a macromolecular complex
10. Starch and glycogen are similar because they
A. both have many peptide bonds
B. both have many α1,4 glycosidic linkages
C. both are used primarily as a storage mechanism for glucose
D. both bind well to hydrophobic compounds
E. B & C
11. Drugs related to penicillin act by
A. destroying α glycosidic bonds
B. putting holes into bacterial membranes
C. inhibiting enzymes that help construct the cell wall of bacteria
D. disrupting nucleic acids in the bacteria
E. disrupting cellular respiration in bacteria
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