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25 Cards in this Set
- Front
- Back
What cell cycle regulatory protein is a tumor-suppressor protein?
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p53
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Proteins with postitive charges that are wrapped around DNA within chromosomes are:
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histones
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If cell division is no longer posssible, eukaryotes can arrest the cell cycle. During which stage is this decision made?
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G1
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What causes cancer in cells?
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Damage to genes failing to stop cell division.
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During metaphase:
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Chromosomes line up on the equatorial plane.
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The G1, S, and G2 phases of the cell cycle are collectively know as:
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interphase
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Most eukaryotes have between ___________ chromosomes in their body cells.
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10 and 50
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Cigarette smoke causes mutations in the p53 gene.
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True
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Which of the following does not occur during telophase:
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The nuclear membrane disappears.
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Which is not correct about the way prokaryotes divide?
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The replication of DNA occurs in one direction around the circle.
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All of the following are correct about cancer except:
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benign cells are those that have metastasized
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What is telomerase?
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An enzyme that adds bases back to the tip of chromosomes every time a cell divides
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The spindle is:
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the network of protein cables that will pull the chromatids ends of th cell
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Which is incorrect about chromosomes?
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Chromosomes all have the same number of genes on them.
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The eukaryotic cell cycle is controlled at several points; which of these is not a control point?
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Cell growth is assessed at the S checkpoint.
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You look in the microscope and see sister chromatids moving to opposite sides of the cell. You conclude the cell is in:
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anaphase
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During which stage of the cell cycle does the synthesis of microtubues occur?
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Prophase
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After duplicaton, sister chromatids, remain joined together:
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by the centromere
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All of the following are correct about HER2 except:
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Most colon cancers have excess copies of this protein on their cells.
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During which mitotic stage is the spindle disassembled, the nuclear membrane formed and the chromosome uncoil?
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Telophase
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Identical copies of each chromosome are called __________and are joined at the _______.
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Sister chromatids; centromere
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Which is incorrect about p53?
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It stimulates th activity of DNA repair enzymes.
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The diploid number of chromosomes in humans is 46. The haploid number is:
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23
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Mutations disabling key elements of the G1 checkpoint are associated with many cancers.
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True
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The proper sequence, beginning to end, for stages of mitosis is:
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Prophase, metaphase, anaphase and telophase
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