Ch 12 and 13 extra practice Flashcards
For a newly evolving protist, what would be the advantage of using eukaryote-like cell division rather than binary fission?
Cell division would allow for the orderly and efficient segregation of multiple linear chromosomes.
At which phase are centrioles beginning to move apart in animal cells?
prophase
Which of the following was a discovery that had to be made before human chromosomes could be correctly counted?
how to use a hypotonic solution to swell nuclei
What is a cleavage furrow?
a groove in the plasma membrane between daughter nuclei
A plant-derived protein known as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in G2?
The chromosomes would coil and shorten but have no spindle to which to attach.
The cyclin component of MPF is destroyed toward the end of which phase?
M
Which of the following describe(s) cyclin-dependent kinase (Cdk)?
Cdk is present throughout the cell cycle and is an enzyme that attaches phosphate groups to other proteins
After which checkpoint is the cell first committed to continue the cell cycle through M?
G1
Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the plate. This cell is most likely
a plant cell in the process of cytokinesis
One difference between cancer cells and normal cells is that cancer cells
continue to divide even when they are tightly packed together
The decline of MPF activity at the end of mitosis is due to
the degradation of cyclin
In the cells of some organisms, mitosis occurs without cytokinesis. This will result in
cells with more than one nucleus
Which of the following does not occur during mitosis?
replication of DNA
In the human species, all somatic cells have 46 chromosomes. Which of the following can also be true?
A plant species (privet shrubs) has 46 chromosomes per cell.
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
metaphase
