Which of these is paired incorrectly?
a. prometaphase—the kinetochores become attached to spindle fibers
b. anaphase—daughter chromosomes migrate toward spindle poles
c. prophase—the chromosomes condense and the nuclear envelope disintegrates
d. metaphase—the chromosomes are aligned at the metaphase plate
e. telophase—a resting phase between cell division cycles
e. telophase—a resting phase between cell division cycles
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Bacteria stain as gram-positive or gram-negative because of differences in the cell
A) wall. B) cytoplasm. C) nucleus. D) chromosome.
Which of the following events involves the release of enzymes?
A. cell cleavage B. cortical reaction C. egg membrane depolarization D. increase in cytosolic calcium within the egg E. the fusion of egg and sperm nuclei
Which of the following is not correct concerning the plague?
What will be an ideal response?
Countercurrent exchange is evident in
A) the flow of water across the gills of a fish and that of blood within those gills. B) the flow of blood in the dorsal vessel of an insect and that of air within its tracheae. C) the flow of air within the primary bronchi of a human and that of blood within the pulmonary veins. D) the flow of water across the skin of a frog and that of blood within the ventricle of its heart. E) the flow of fluid out of the arterial end of a capillary and that of fluid back into the venous end of the same capillary.