Ehrlich and Raven hypothesized that if a new defensive trait evolves in a single plant species (or if a new trait to counteract a plant's defenses evolves in an herbivore species)
the
appearance of that trait could result in a period of species diversification. Their hypothesis is
also referred to as:
A. the "diverge and converge" hypothesis.
B. the "reverse and diverse" hypothesis.
C. the "emit and commit" hypothesis.
D. the "merge and diverge" hypothesis.
E. the "escape and radiate" hypothesis.
E
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An atom with three electrons _______________________
A. has one orbital with three electrons B. has two orbitals, one of which has two electrons, the other has one C. has three orbitals, each of which contains one electron D. has three energy shells, each of which contains one electron
Place the following cell types in the correct order during the differentiation of a hematopoetic stem cell (HSC) into a macrophage. Some may be used once or not at all.
I. megakaryocyte II. lymphoid progenitor III. macrophage IV. hematopoetic progenitor V. myeloid progenitor VI. monocyte VII. hematopoetic stem cell A. VII, IV, V, VI, III B. IV, VII, V, VI, III C. IV, VII, II, VI, III D. VII, IV, V, II, III E. VII, IV, II, IV, III
New cases of tuberculosis are frequently the result of reactivation of old dormant infections.
Answer the following statement true (T) or false (F)
Cell plate formation
a. occurs in plant cells but not in animal cells. b. usually begins during telophase. c. is a result of fusion of Golgi vesicles. d. is all of the above.