1) A group of cells is assayed for DNA content immediately following mitosis and
ID: 33764 • Letter: 1
Question
1) A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. Those cells would have picograms at the end of the S phase and picograms at the end of G2. (lpt) (A) 8,8 (C) 16,8 (B) 8,16 (D) 16,16 2) If there are 12 chromosomes in an animal cell in the G1 stage of the cell cycle, what is the diploid number of chromosomes for this organism? (lpt) (A) 6 (C) 24 (B) 12 (D) 36 3) Cytokinesis usually, but not always, follows mitosis. If cells undergo mitosis and not cytokinesis, this would result in (lpt) (A) a cell with a single large nucleus (C) cells with abnormally small nuclei (B) a cell with two or more nuclei (D) feedback responses that prevent mitosis 4) If you were examining a skin cell during one complete cell cycle, which of the following would you never observe? (1pt) (A) interphase (C) synapsis (B) prophase (D) metaphase Match the following parts of the cell cycle chart to their descriptions: 5) Mitosis (1/2pt) 6) Growth (1/2pt) 7) Growth and Check Point (1/2pt) 8) DNA Replication (1/2pt)Explanation / Answer
1. D (DNA replication takes place in S phase, hence DNA amount will be increased)
2. C (n=12, 2n=24)
3. B (mitosis without cytokinesis results coenocytic state)
4. C (synapsis doesn't occur in somatic cell cycle. it occurs only in meiosis)
5. D (4 stages in D indicates 4 phases i.e., prophase, metaphase, anaphase and telophase)
6. A (after mitosis, G1 (growth) phase)
7. C (After S phase G2 phase and check points will be appeared)
8. B (S phase occurs in between G1 & G2, )
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