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Q 1/82
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preexisting cell
30
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Q 2/82
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part of eukaryotic cell division during which the cell nucleus divides. Two cells identical to each other
30
Mitosis
82 questions
Q.
preexisting cell
1
30 sec
Q.
part of eukaryotic cell division during which the cell nucleus divides. Two cells identical to each other
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Cell division that produces reproductive cells in sexually reproducing organisms. It involves two successive nuclear divisions with only one round of DNA replication, producing 4 haploid cells (not identical)
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G1, S, G2
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cell cycle arrest.
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See image
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Cellular contents, excluding the chromosomes, are duplicated
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The synthesis phase of the cell cycle; the portion of interphase during which DNA is replicated.
8
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The second gap, or growth phase, of the cell cycle, consisting of the portion of interphase after DNA synthesis occurs. Double checks for errors
9
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two identical strands or chromatids but is still ONE chromosome
10
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depends on many factors, including the rate of cell of division in the tissue
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Usually lasts about 8 Hr
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2.5-3 hrs (Always the shortest)
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Divide (permanently in G0)
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contact inhibition
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keeps cells in a tissue from dividing to control growth of tissue/organ
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inhibition
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spends more time in G0 or G1 before reaching S phase
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prophase, metaphase, anaphase,
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See image
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Chromosomes become visable, nuclear envelop dissolves, spindle forms
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The nuclear membrane disintegrates. Spindle microtubules attach to chromatids via kinetochore and undergo active movement
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Chromosomes line up in the middle of the cell. Kinetochore microtubules attach sister chromatids to opposite poles of spindle
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the chromosomes move away from one another to opposite poles of the spindle.
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See image
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the two daughter chromosomes arrive at the poles and decondense. New nuclear envelope develops, completing formation of two nuclei marking the end of mitosis.
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division of the cytoplasm by a contractile ring of actin/myosin, which creates two daughter, each with one nucleus
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See image
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protein that holds sister chromatids together
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reorganizes chromosomes into their highly compact mitotic structure
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form rings and bind ATP
31
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Causes chromosome condensation in prophase. Each sister chromatid can be easily separated.
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Becomes inactivated in telophase and causes chromatin to decondense
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chromatin; ATP hydrolysis
34
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1) Holds two identical sister chromatids after chromosome is replicated in S phase.
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See image
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See image
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nondisjunction
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the failure of homologous chromosomes or sister chromatids to separate properly during cell division. Failure of cohesins basically
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Mitosis, meiosis I or Meiosis II
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Mosaicism
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contractile ring during cytokinesis
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disassembly and reassembly of the nuclear envelope
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chromatin can condense
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See image
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See image
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breakdown of lamina (Breakdown of envelope)
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they reassemble into the lamina
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forming the mitotic spindle
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move chromosomes towards poles
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See image
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The spindle checkpoint is a surveillance mechanism that delays anaphase onset until all chromosomes are correctly attached.
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arrest cell cycle progression at mitosis and then cell death (apoptosis)
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microtubules
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binds MTs tightly and stabilizes them
55
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See image
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It will kill every dividing cell in the body, not just cancer cells
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See image
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arrested in mitosis and leads to cell death
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2 identical cells
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See image
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See image
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4 different cells
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See image
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See image
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synapsis; crossing over
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new combination of genes, few are similar to mother and father
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spermatogenesis
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See image
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oogenesis
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See image
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gametes
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Yes, mistakes are made with some frequency in this complicated process
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1) Failure of homologs to separate properly
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See image
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See image
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See image
77
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are a common cause of both spontaneous abortion (miscarriage) and intellectual disability
78
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when a woman ovulates an egg, that egg was arrested in first meiotic prophase for > 40 years!
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during embryonic development, but halts in PROPHASE I until just before ovulation
