Question 17 The ___ ends of microtubules physically attach to chromosomes during mitosis at protein structures called ___. A plus, centrosomes B minus, kinetochores C plus, kinetochores D plus, centromeres E minus, centromeres 2.5 Points
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What cytoskeletal element is responsible for attaching to kinetochores and moving the chromosomes to the opposite poles of the cell during anaphase? a. microtubules b. intermediate filaments c. microfilaments d. sister chromatids
Sri K.
1) The centromere is a region in which A) new spindle microtubules form at either end. B) chromosomes are grouped during telophase. C) the nucleus is located prior to mitosis. D) chromatids remain attached to one another until anaphase. E) metaphase chromosomes become aligned at the metaphase plate. 2) If there are 20 chromatids in a cell, how many centromeres are there? A) 80 B) 10 C) 30 D) 40 E) 20 3) Which is the longest of the mitotic stages? A) anaphase B) telophase C) prometaphase D) metaphase E) prophase 4) A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei each containing how many chromosomes? A) 92 B) 16 C) 23 D) 46 E) 12 5) Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cell with A) two nuclei but with half the amount of DNA. B) a single large nucleus. C) two nuclei. D) two abnormally small nuclei. E) high concentrations of actin and myosin. 6) The formation of a cell plate is beginning across the middle of a cell and nuclei are re-forming at opposite ends of the cell. What kind of cell is this? A) an animal cell undergoing cytokinesis B) an animal cell in telophase C) an animal cell in metaphase D) a plant cell undergoing cytokinesis E) a plant cell in metaphase 7) Chromosomes first become visible during which phase of mitosis? A) metaphase B) prometaphase C) telophase D) prophase E) anaphase
Madhur L.
Which of the following best describes the kinetochore? A structure composed of several proteins that associate with the centromere region of the chromosome and that can bind spindle microtubules. B. The centromere region of metaphase chromosome at which the DNA can bind with spindle proteins. C. The array of vesicles that will form between dividing nuclei and give rise to the metaphase plate. D. The ring of actin microfilaments that will cause the appearance of the cleavage furrow. E. The core of proteins that forms the cell plate in dividing plant cells.
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