According to the classifications used by most genetic ancestry testing companies, which human population group includes Native Americans?
A. Pacific Islanders
B. Asians
C. Africans
D. Europeans
Answer: B. Asians
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While examining the leaves of an Elodea (a popular water plant) under a microscope, the large green chloroplasts can be seen streaming through the cells as if pushed by a water current. What junction might be the source of this cytoplasmic streaming in the Elodea leaves?
a. desmosome b. tight junction c. plasmodesmata d. gap junction
What is the thick fluid, rich in proteins and lipids, which is deposited in an animal's egg during its formation?
a. germ layer b. placenta c. yolk d. corpus luteum e. gastrula
The skull of the chimpanzee and human are most
closely related a. as 48-hour embryos. b. as adults. c. as adolescents. d. as infants. e. never; they are not structurally close.
Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? The animal cell is in _____
A) a hypotonic solution, and the plant cell is in an isotonic solution B) an isotonic solution, and the plant cell is in a hypertonic solution C) a hypertonic solution, and the plant cell is in an isotonic solution D) an isotonic solution, and the plant cell is in a hypotonic solution