To explain the origin of the nuclear genome, which of the following hypotheses are most widely accepted?
A. Endosymbiotic relationship.
B. Symbiotic relationship.
C. Mitochondrial relationship.
D. Both the endosymbiotic and symbiotic relationships.
E. Endosymbiotic, symbiotic and mitochondrial relationships.
D. Both the endosymbiotic and symbiotic relationships.
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An individual who avoids light is exhibiting
a. negative phototaxis. b. positive geotaxis. c. negative thigmotaxis. d. positive thigmotaxis.
Although they are mammals, monotremes lack
A) ovaries in females. B) nipples. C) mammary glands. D) hair. E) a four-chambered heart.
Which of the following occurs during interphase?
A) a reduction in the size of the nuclear membrane B) cytokinesis C) cell growth and duplication of the chromosomes D) separation of newly formed DNA to opposite ends of the cell
Which microscope takes advantage of differences in the refractive indexes of cell structures?
A) compound light microscope B) phase-contrast microscope C) darkfield microscope D) fluorescence microscope E) electron microscope