Question

1. which phase of mitosis is characterized by the separation of sister chromatids? a. telophase b. anaphase c. prophase d. metaphase 11. in a homeostatic mechanism, what typically happens when the bodys temperature drops too low? a. blood vessels dilate to release heat. b. the body initiates sweating to cool down. c. cells decrease activity to conserve energy, and shivering may occur to generate heat. d. the heart rate decreases to slow down blood circulation. 12. what is selective permeability? a. the ability of the cell to divide and reproduce. b. the ability of the cell to produce energy. c. the ability of the cell membrane to store nutrients. d. the ability of the cell membrane to regulate what enters and exits the cell.

Explanation:

1. In anaphase of mitosis, sister chromatids separate and are pulled to opposite poles of the cell by the spindle fibers.
2. When body temperature drops too low in a homeostatic mechanism, cells may decrease activity to conserve energy and shivering can occur to generate heat.
3. Selective permeability is the property of the cell - membrane that allows it to regulate what enters and exits the cell.

Answer:

1. b. Anaphase
2. c. Cells decrease activity to conserve energy, and shivering may occur to generate heat.
3. d. The ability of the cell membrane to regulate what enters and exits the cell.