Biology 1320 Exam Two Fall 2012

100 Questions | Total Attempts: 49

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Biology 1320 Exam Two Fall 2012

Questions and Answers
  • 1. 
    Which of the following are not components of the plasma membrane?
    • A. 

      Proteins

    • B. 

      Phospholipids

    • C. 

      Sterols

    • D. 

      Nucleic Acid

    • E. 

      All of these are components

  • 2. 
    Which membrane component is involved in cystic fibrosis?
    • A. 

      A recognition protein

    • B. 

      An adhesion protein

    • C. 

      A transport protein

    • D. 

      A communication sugar

    • E. 

      A receptor protein

  • 3. 
    The organelle that pinches off portions of its membrane to form a compartment used for storage or transport is the:
    • A. 

      Vesicle

    • B. 

      Mitochondrion

    • C. 

      Chloroplast

    • D. 

      Nucleolus

    • E. 

      Dictyosome

  • 4. 
    Hooke was the first to observe cells under a simple microscope in the 1600s because he was looking at:
    • A. 

      Plant cells in which the thick cell wall was clearly visible and reminded him of prison cells

    • B. 

      Flagellated eukaryotic cells that were moving

    • C. 

      Flagellated bacterial cells that were moving

    • D. 

      Egg cells, which can be extraordinarily large

    • E. 

      Cells that were naturally colored

  • 5. 
    Which of the following will diffuse across a lipid bilayer?
    • A. 

      Sodium ions

    • B. 

      Potassium

    • C. 

      DNA

    • D. 

      Carbon dioxide

    • E. 

      Glucose

  • 6. 
    The RNA in the nucleus leaves through 
    • A. 

      Frets

    • B. 

      Ribosomes

    • C. 

      Vessicles

    • D. 

      Nuclear pores

    • E. 

      Thylakoids

  • 7. 
    The largest cytoskeletal element is the:
    • A. 

      Actin molecule

    • B. 

      Microfilament

    • C. 

      Microtubule

    • D. 

      Intermediate filament

    • E. 

      Myosin molecule

  • 8. 
    The energy for flagellar movement (as in sperm swimming)
    • A. 

      Appears to come from protein polarization

    • B. 

      Comes directly from dictyosomes

    • C. 

      Appears to come from mitochondria

    • D. 

      Endoplasmic reticuli

    • E. 

      Comes directly from oxygen

  • 9. 
    You received all of your mitochondria from 
    • A. 

      Dad

    • B. 

      Plants

    • C. 

      Fish

    • D. 

      Mom

    • E. 

      Protozoans

  • 10. 
    Probably the most important cross-linkage determining the tertiary structure of many proteins is the: 
    • A. 

      Disulfide bridge

    • B. 

      Hydrogen bond

    • C. 

      Ester

    • D. 

      Peptide bond

    • E. 

      None of the above

  • 11. 
    In general, the net movement of molecules in a fluid is a response to the 
    • A. 

      Electrical gradient

    • B. 

      Energy gradient

    • C. 

      Heat gradient

    • D. 

      Concentration gradient

    • E. 

      Pressure gradient

  • 12. 
    Ribonucleic acid differs from deoxyribonucleic acid in that RNA substitutes:
    • A. 

      Ribose for deoxyribose

    • B. 

      Uracil for thymine

    • C. 

      Uracil for cytosine

    • D. 

      Both ribose for deoxyribose AND uracil for thymine

    • E. 

      Both ribose for deoxyribose AND uracil for cytosine

  • 13. 
    A white blood cell engulfing a bacterium is an example of _____.
    • A. 

      Receptor-mediated endocytosis

    • B. 

      Exocytosis

    • C. 

      Pinocytosis

    • D. 

      Facilitated diffusion

    • E. 

      Phagocytosis

  • 14. 
    The system of canals, tubes, and sacs that transports molecules inside the cytoplasm is the:
    • A. 

      Golgi bodies

    • B. 

      Ribosomes

    • C. 

      Vesicles

    • D. 

      Lysosomes

    • E. 

      Endoplasmic reticulum

  • 15. 
    Lysosomes contain _____ enzymes.
    • A. 

      Synthesis

    • B. 

      Digestive

    • C. 

      Photosynthetic

    • D. 

      Growth

    • E. 

      Respiration

  • 16. 
    What is a role of proteins found in eukaryotic plasma membranes:
    • A. 

      Copying DNA

    • B. 

      Regulating the flow of materials through the membrane

    • C. 

      Building proteins

    • D. 

      Immune system action

    • E. 

      All of the above

  • 17. 
    Organisms sometimes need sulfur for synthesis of: 
    • A. 

      Nucleotides

    • B. 

      Ribosomes

    • C. 

      Protein

    • D. 

      Fats and oils

    • E. 

      Phospholipids

  • 18. 
    In a lipid bilayer, _____ of lipid molecules are sandwiched between _______.
    • A. 

      The two unit membanes

    • B. 

      Hydrophilic tails; hydrophobic heads

    • C. 

      Hydrophilic heads; hydrophilic tails

    • D. 

      Hydrophobic tails; hydrophilic heads

    • E. 

      Hydrophobic heads; hydrophilic tails

  • 19. 
    The stacks of coin-shaped (mint-like) double membranes found in chloroplasts are
    • A. 

      Frets

    • B. 

      Plasma membranes

    • C. 

      Vacuolar membranes

    • D. 

      Golgi bodies

    • E. 

      Grana

  • 20. 
    1. What is the fate of defective or malfunctioning organelles in cells?
    • A. 

      They are broken down by cytoplasmic enzymes

    • B. 

      They are exported by exocytosis

    • C. 

      They are stored in plastids

    • D. 

      They accumulate in the cytoplasm, eventually resulting in cell death

    • E. 

      They are broken down by lysosomal digestive enzymes

  • 21. 
    Which of the following is/are not required for cell function since prokaryotes do not have them?
    • A. 

      A plasma membrane

    • B. 

      Transport mechanisms to bring substances in from outside of the cell

    • C. 

      Mitochondria

    • D. 

      Ribosomes

    • E. 

      DNA

  • 22. 
    Which one of the following organelles resembles a bacterium in its size and biochemistry?
    • A. 

      A lyzosome

    • B. 

      The nucleolus

    • C. 

      The endoplasmic reticulum

    • D. 

      A golgi body

    • E. 

      A mitochondrion

  • 23. 
    Which organelle below is capable of producing its own protein since it has its own ribosomes? 
    • A. 

      Dictyosome

    • B. 

      Lysosome

    • C. 

      Chloroplast

    • D. 

      Microtubule

    • E. 

      None of the above

  • 24. 
    Cystic fibrosis
    • A. 

      Develops when a person inherits a single copy of a mutant gene

    • B. 

      Is the most common fatal genetic disorder in the United States

    • C. 

      Can be cured by antibiotics

    • D. 

      Affects primarily mucle cells

    • E. 

      All of these are correct

  • 25. 
    A phospholipid has a phosphate-containing head and two fatty acid tails attached to a backbone of 
    • A. 

      Nucleic acid

    • B. 

      Glycerol

    • C. 

      Glycogen

    • D. 

      Guanine

    • E. 

      Glucose

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