Given the distribution of the 30 or so animal phyla across the Earth's various ecosystems, what would be the most likely habitat for the origin of animals?
A. Deserts
B. Temperate grassland
C. Oceans
D. Freshwater habitats
E. Rain forests
Answer: C
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Modern humans evolved about
a. 200,000 years ago. b. 2,000,000 years ago. c. 2,000,000,000 years ago. d. 4,600,000,000 years ago.
All of the following are true of the natural killer cells
(NK cells) EXCEPT that they a. are most active in innate responses. b. are central to adaptive immunity, like B and T cells. c. alert the immune system to the presence of antigens. d. kill weakened or dying body cells. e. combat viral infections and cancer.
If current trends in global warming continue for the next 50 years, where will the greatest effects of global warming likely be felt?
A) the continental United States B) the Pacific Ocean C) the Mississippi River D) Russia
You analyze two daughter cells of Bacteria A immediately after binary fission. Which of the following is ACCURATE about the daughter cells?
A. They are members of the same colony. B. They have genetically identical chromosomes. C. They are members of the same colony and they have genetic contributions from two different parent cells. D. They are members of the same colony and have genetically identical chromosomes. E. They have genetic contributions from two different parent cells.