Briefly summarize the four phases of mitosis and cytokinesis. What will be an ideal response?
ANSWER: Prophase: Chromosomes become visible as threadlike structures. As they continue to
condense, they are seen as double structures, with sister chromatids joined at a single
centromere.
Metaphase: Chromosomes become aligned at equator of cell.
Anaphase: Centromeres divide, and chromosomes move toward opposite poles.
Telophase: Chromosomes decondense; nuclear membrane forms.
Cytokinesis--Cleavage furrow gradually tightens and the cell eventually divides in two,
distributing organelles to the daughter cells.
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What will be an ideal response?
Which of the following does not illustrate the use of universal precaution methods in the handling of patients and body substances?
A. Healthcare worker with active, open lesions handling patients B. Mask and gloves C. Proper disposal of needles D. Sterilizing or disinfection of dental hand pieces E. Hand washing
Dominant Structuring Factor: Habitat
What will be an ideal response?
The broadleaved deciduous forests of eastern North America contain many species of trees. Which of the following statements best describes the geographic distributions of these species?
A) Groups of species found in any part of this region have very similar distributions. B) Each species occupies a small geographic area from which all other species are excluded. C) Each species has a different geographic range, but these ranges overlap to some extent. D) none of the above