ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have circular chromosomes that aresegregated by attachment to the plasma membrane.
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They have circular chromosomes that are segregatedby attachment to spindle microtubules.
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Chromosomes are not condensed during nucleardivision.
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The nuclear envelope remains intact duringdivision.
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Detailed explanation-1: -Diatoms and some yeasts are unicellular eukaryotes that have mechanisms of nuclear division that may resemble intermediate steps in the evolution of mitosis. Which of the following is a characteristic feature of nuclear division in these organisms? The nuclear envelope remains intact during division.
Detailed explanation-2: -Stages of mitosis: prophase, metaphase, anaphase, telophase. Cytokinesis typically overlaps with anaphase and/or telophase.
Detailed explanation-3: -Nuclear envelope reassembly These components are dismantled during prophase and prometaphase and reconstructed during telophase, when the nuclear envelope reforms on the surface of separated sister chromatids.
Detailed explanation-4: -Which of the following is a characteristic feature of nuclear division in these organisms? Chromosomes are segregated by a mitotic spindle, but the nuclear envelope remains intact during division.
Detailed explanation-5: -Mitosis is used to produce daughter cells that are genetically identical to the parent cells. The cell copies-or ‘replicates’-its chromosomes, and then splits the copied chromosomes equally to make sure that each daughter cell has a full set.