13. A cell is treated with a drug that prevents kinetochore microtubules from attaching to chromosomes. Which stage of mitosis would most likely be disrupted? (A) DNA replication during S phase (B) Alignment of chromosomes at the metaphase plate (C) Cytokinesis (D) Chromosome condensation during prophase

16. Nucleotides can be radiolabeled before they are incorporated into newly forming DNA and, therefore, can be assayed to track their incorporation. In a set of experiments, a student-faculty research team used labeled T nucleotides to study the incorporation of labeled nucleotides into a culture of lymphocytes. They found that the lymphocytes incorporated the labeled nucleotide at a significantly higher level after a pathogen was introduced into the culture. What might they conclude from this observation? (A) The pathogen consumed radiolabeled nucleotides. (B) Infection causes lymphocytes to divide more rapidly. (C) Infection causes lymphocytes to increase in size. (D) Infection causes lymphocyte cultures to skip some parts of the cell cycle.

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