Which of the following is TRUE of cell cleavage?
A. It involves consecutive cycles of cell division without cell growth.
B. It forms a blastula.
C. It is a rather slow event of embryonic development.
D. It involves consecutive cycles of cell division without cell growth and forms a blastula.
E. It is a rather slow event of embryonic development involving consecutive cycles of cell division.
D. It involves consecutive cycles of cell division without cell growth and forms a blastula.
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An atom X contains 14 protons, 13 electrons, and 12 neutrons, and atom Y contains 14 protons, 14 electrons, and 12
neutrons. What can you conclude? a. Y is an ion but X is not. b. X and Y are both ions. c. X and Y both have filled valence shells. d. X and Y are isotopes of the same element. e. X and Y are atoms of the same element.
Plant cells have plasmodesmata that
A) take the place of the plasma membrane that would be found in animals B) resemble the cytoskeleton of animal cells C) are the sites of starch production D) connect the cytoplasm of one cell with that of another E) function in photosynthesis
Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America
What outcomes could possibly occur where the ranges of two species overlap? I) The species will interbreed, eventually fusing over time. II) A stable hybrid zone will form if hybrids are better adapted to the area of overlap than either parent species is. III) Species will continue to diverge and be isolated by behavioral or genetic mechanisms. A) I B) II C) III D) I, II, and III
Paul Ehrlich used chemotherapy to treat
A. cholera. B. cancer. C. anthrax. D. smallpox. E. syphilis.