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  • Question
  • An organism's first line of defense against attack by an invader such as a virus or bacterium is usually


  • Options
  • A. to flee or hide
  • B. its body wall
  • C. a specific immune response
  • D. a nonspecific immune response

  • Correct Answer
  • its body wall 


  • Cell Structure and Compartments problems


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    • 1. What do dystrophin, utrophin, actin, and tubulin have to do with eukaryotic cell structure and function?

    • Options
    • A. They are components in the reactions of photosynthesis
    • B. They all participate in the degradation of large amounts of ATP
    • C. They all participate in the production of large amounts of ATP
    • D. They are all embedded proteins in plasma membranes
    • Discuss
    • 2. In which of the following cell organelles, it is expected to find the biochemical reactions that harness energy from the breakdown of sugar molecules to synthesize large amounts of ATP?

    • Options
    • A. Lysosome
    • B. Vesicles
    • C. Mitochondria
    • D. Plasma membrane
    • Discuss
    • 3. Which of the following is present in both prokaryotes and eukaryotes?

    • Options
    • A. Lysosome
    • B. Chloroplast
    • C. Plasma membrane
    • D. Vacuole
    • Discuss
    • 4. Lysosomes are specialized vesicles in __________ that contain digestive enzymes for the breakdown of food. A related organalle known as a vacuole, which is found in __________ , also contains enzymes but in addition may act as a storage organelle for nutrients or water.

    • Options
    • A. animals; plants and fungi
    • B. plants; animals and fungi
    • C. plants and fungi; animals
    • D. animals and plants; fungi
    • Discuss
    • 5. The highly folded membranes found in such eukaryotic organelles as mitochondria and chloroplasts

    • Options
    • A. increase the surface area where key chemical processes can occur
    • B. help the cell against physical damage
    • C. make it possible to package large amounts of DNA within the cell
    • D. assist with cell movement
    • Discuss
    • 6. Which of the following are responsible causing the diseases?

    • Options
    • A. Pathogens
    • B. T cells
    • C. Lymphocytes
    • D. Macrophages
    • Discuss
    • 7. Eukaryotic cells are more efficient than prokaryotes because their internal compartmentalization

    • Options
    • A. makes each compartment nutritionally independent of all others
    • B. allows for specialization through the subdivision of particular tasks
    • C. allows for specialization through merging of different tasks
    • D. reduces overall cell size
    • Discuss
    • 8. Which of the following macromolecules are found in the plasma membrane?

    • Options
    • A. Lipids and proteins only
    • B. Lipids, proteins, and carbohydrates
    • C. Proteins and carbohydrates only
    • D. Proteins only
    • Discuss
    • 9. The simplest way to differentiate a prokaryotic cell from a eukaryotic one is to

    • Options
    • A. look for a plasma membrane
    • B. see if a nucleus is present
    • C. check for the presence of DNA
    • D. determine if the cell is an entire organism or not
    • Discuss
    • 10. A certain cell organelle which is made of a double phospholipid bilayer that has many large pores in it, is most likely

    • Options
    • A. the nuclear envelope
    • B. the plasma membrane
    • C. the mitochondrion
    • D. the cytoskeleton
    • Discuss


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