Honors Bio- 10/22

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Honors Bio- 10/22
2010-10-21 22:10:38
Honors Bio

Biology quiz
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  1. Interphase
  2. Anaphase
  3. Metaphase
  4. Telophase
  5. Prophase
  6. Prophase
  7. Metaphase
  8. Anaphase
  9. Telophase
  10. Interphase
  11. What phase are MOST cells in? Why? Explain.
    Interphase, doesn't take long for stages of mytosis.
  12. Do all cells divide? If not, what are cells that do not divide?
    No, brain cells
  13. What is the division of cytoplasm called?
  14. What is the division of a nucleus called?
  15. What are spindle fibers?
    Spindle fibers are thin strands that attach to sister chromatids to pull them apart during anaphase
  16. What is centromere?
    The place on the sister chromatids where it is crossed and where the spindle fibers attach
  17. What is centriole?
    the part of the cell that produces spindle fibers
  18. Why do the sister chromatids need to be made?
    So the DNA can be replicated and cells can be reproduced
  19. When are the sisrer chromatids created?
    During interphase
  20. How are the sister chromatids related to one another?
    Identical copies of chromosomes
  21. When are the chromosomes first visible?
    During mitosis
  22. What form is the DNA in during interphase?
  23. What is chromatin?
    • Long loose threads
    • This form during most of the cell cycle
  24. What is a chromosome?
    Condensed chromatin
  25. What are the different forms of DNA in the cell cycle?
    Chromatin, Chromosomes, Sister Chromatids
  26. How is cytokinesis different in plants and animals?
    • Plants: cell plate
    • Animals: cleavage furrow
  27. What is cytokinesis?
    • Cytoplasm pinches in half
    • Each daughter cells (2) has identical set of duplicate chromosomes
  28. What occurs in telophase?
    • Chromosomes gather at opposite ends of cell
    • Chromosomes unwind to form the threadlike chromatin again
    • Two nuclear membranes form
  29. What occurs in anaphase?
    Sister chromatids seperate
  30. What occurs in metaphase?
    • Chromosomes line up in the middle of the cell
    • Chromosomes connect to spindle fibers at centromere
  31. What occurs in prophase?
    • Chromatin condenses (forms chromosomes)
    • Centrioles seperate (begin to form spindle)
    • Nuclear membrane and nucleus begin to break down
  32. What are the four phases of mitosis (in order)?
    Prophase, Metaphase, Anaphase, Telophase
  33. What occurs in G2?
    • Cell prepares for mitosis
    • Checks to see if DNA is fully replicated and if there is proper growth/organelles
  34. What occurs in S?
    DNA is replicated, sister chromatids are made
  35. What occurs in G1?
    • Checkpoint to check if there is a need for cells and if the DNA is damaged
    • If not, remain in resting phase (G0)
  36. What are the three phases of interphase (in order)?
    G1, S, G2
  37. What are the three phases of the cell cycle (in order)?
    Interphase, Mitosis, Cytokinesis
  38. What are two problems that cell growth causes?
    • Larger cells which have more demands
    • Volume is increasing faster than the surface area
  39. What is the name of the process in which prokaryotic cells divide?
    Reproduction- binary fission
  40. Why do prokaryotic cells divide?
    • To reproduce- binary fission
    • Only have one circular chromosome
  41. Why do eukaryotic cells divide?
    To replace dead cells, repair damaged tissue, growth of an organism, problem of cell growth