Which group of vertebrates was the first to evolve a waterproof egg, which allowed the group to move away from water, deeper onto dry land?
A) Reptiles B) Lobefins C) Mammals D) Primates E) Birds
A
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During the mitotic spindle checkpoint,
a. cells are in anaphase. b. cells arrest if chromosomes are attached properly to the mitotic spindle. c. cells become irreversibly committed to S phase. d. cells are checked for proper spindle attachment to chromosomes. e. cells enter G0.
Nitrogen (N) is more electronegative than hydrogen (H). Which of the following is a correct statement about the atoms in ammonia (NH3)?
A) Each hydrogen atom has a partial positive charge; the nitrogen atom has a partial negative charge. B) Ammonia has an overall positive charge. C) Ammonia has an overall negative charge. D) The nitrogen atom has a partial positive charge; each hydrogen atom has a partial negative charge.
Which of the following is an advantage of the biological species concept over other common species concepts?
a. It can be applied to both plants and animals. b. It does not require a subjective partitioning of species. c. It can be applied to fossils. d. It takes into account all aspects of a species niche. e. All of the listed responses are correct.
Arrange the steps of the HIV life cycle in the correct order:1. Assembly 2. Integration 3. Entry4. Fusion 5. Attachment6. Budding 7. Biosynthesis and cleavage 8. Reverse transcription
A. 1, 2, 3, 4, 5, 6, 7, 8 B. 5, 4, 3, 8, 2, 7, 1, 6 C. 1, 3, 2, 4, 5, 7, 6, 8 D. 4, 6, 3, 7, 2, 8, 1, 5 E. 8, 1, 7, 2, 6, 3, 5, 4