BIOL Module 5 – Flashcards
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Inheritance of mutant forms of some genes may lead to a predisposition to develop cancer. Which of the genes listed below has not been linked to hereditary forms of cancer?
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BRCA-1
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How do the daughter cells at the end of mitosis and cytokinesis compare to their parent cell when it was in G1 of the cell cycle?
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The daughter cells have the same number of chromosomes and the same amount of DNA.
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Many growth factors are classified as which of the following?
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proto-oncogenes
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The drug chloral hydrate prevents elongation of microtubules by preventing the addition of new subunits to the growing end. During which stage of mitosis would chloral hydrate be most harmful?
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prophase
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Rebecca found out that she has a mass of dividing cells called a tumor in her ovaries. She has had tests and is returning to the doctor. What would the best results the doctor could tell her be?
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It is a benign tumor.
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A mutation results in a cell that no longer produces a normal protein kinase for the M-phase checkpoint. Which of the following would likely be the immediate result of this mutation?
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The cell would never leave metaphase.
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The G2 checkpoint prevents the cell cycle from continuing until
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DNA is completely replicated AND damage to DNA can be repaired.
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A protein that promotes apoptosis would be considered a(n)
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tumor suppressor.
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A positive genetic test for telomerase indicates that
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a cell is probably cancerous.
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Multicellular organisms undergo mitotic cell division to
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increase the size of the organism.
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If cancer is discovered at an early stage, which treatment method is most often used?
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surgery
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All of the following statements are true about mitosis except
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the cells arising from the process contain only half of the necessary genetic material.
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Cancer cells have abnormal chromosomes because they express telomerase when they should not.
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False
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Stem cells that contain telomerase can be found in adults.
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True
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Which lifestyle choice is responsible for 90% of the cases of lung cancer among men?
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smoking
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Which is NOT a correct association?
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interphase-shortest stage of the cell cycle
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If a cell has 46 chromosomes at the beginning of mitosis, then at the end of anaphase there would be a total of
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92 chromosomes.
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When during the cell cycle are chromosomes visible?
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during Mitosis
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For the figure shown here, indicate the correct stage of meiosis and diploid chromosome number.
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metaphase I, 2n=4
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During meiosis I, the homologous chromosomes of a tetrad
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face opposite spindle poles.
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Which of the following statements is true?
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Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits.
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During prophase I, a diploid organism contains how many copies of each gene?
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4
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The human life cycle consists of
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adults who are diploid and produce haploid gametes, these gametes fuse to produce a diploid zygote which grows into an adult.
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Which of the following is a correct match?
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separation of sister chromatids - anaphase II
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You are looking at a cell under the microscope, and see what appears to be several "X" structures being pulled to each side of the cell. What stage of meiosis are you looking at?
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anaphase I
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A tetrad is composed of
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two chromosomes with two sister chromatids each.
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Klinefelter syndrome can result from
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nondisjunction during meiosis I or II in either parent.
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Which of the following does not occur twice during meiosis?
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pairing of homologous chromosomes
