Ch. 7 Bio test questions

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youngroos29
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Ch. 7 Bio test questions
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2012-01-24 21:26:20
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Ch. 7 Bio test questions
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  1. Who used a compound microscope to see chambers within cork and named them CELLS?
    ROBERT HOOKE
  2. What are the principles of the Cell Theory?
    • Cells are basic units of life
    • All living things are made of cells
    • All cells are produced from existing cells
  3. What type of details can electrom microscopes reveal?
    Details that are 1000 times smaller than those visible in light microscopes
  4. Which miscroscope can produce three-dimensional images of cell's surface?
    Scanning electron microscope
  5. How do you know that a cell is a prokaryote when looking through a microscope?
    The cell lacks a nucleus
  6. Who are the prokaryotes?
    Bacteria
  7. Who encloses their DNA in a nucleus?
    Eukaryotes
  8. What can a single cell organism (like an amoeba) accomplish?
    It is able to carry out all of the functions necessary for life
  9. What is a tissue?
    A group of similar cells that perform a particular function
  10. In a multicellular organism, what are the levels of organization from simplest to most comploex?
    Cell > Tissue > Organ > Organ System
  11. What is homeostasis?
    The relatively constant internal physical conditions of an organism.
  12. What is in the nucleus?
    Nucleolus, chromatin, DNA
  13. What is the function of the nucleus?
    Stores DNA
  14. Which organelle breaks down organelles that are no longer useful?
    Lysosome
  15. Which organelle stores materials, such as water, salts, proteins, and carbohydrates?
    Vacuole (Be able to identify a vacuole in a plant cell graphic)
  16. Which structure makes proteins?
    Ribosome
  17. Which organelle converts the chemical energy stored in food into usable energy?
    Mitochondrion
  18. What is the function of the cytoskeleton?
    Helps a cell keep its shape
  19. Which structures are involved in cell movement/moving the whole cell?
    Microtubules & Microfilaments
  20. Which organelle is found in plants but not animals?
    Chloroplast
  21. Which structure serves as the cell's boundary from its environment?
    Cell membrane
  22. What is the function of the cell membrane?
    It regulates the movement of molecules into and out of the cell
  23. Why does diffusion occur?
    Molecules constantly move and collide with each other
  24. What is the diffusion of water called?
    Osmosis
  25. What happens when solute concentration is the same on both sides of the membrane?
    Molecules continue to move across the membrane in both directions
  26. Why does an animal cell that is surrounded by fresh water burst?
    Because osomotic pressure causes water to move into the cell
  27. What class of molecules forms channals and pumps in the plasma membrane?
    Proteins
  28. What is the process called where a solute moves from high to low concentration but requires a protein channel through the membrane (ex. Glucose)?
    faciliatated diffusion
  29. Which means of particle transport requires input of energy from the cell?
    Active transport
  30. What is the path of a protein as it is being assembled?
    Ribosomes > Endoplasmic Reticulum > Golgi Apparatus

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