You are studying the island biogeography of birds in the Caribbean islands and find a species-area relationship with a constant, c = 8.1, and an exponent, x = 0.15. Recall that the species-area relationship is defined as S = cAx
How many bird species would you expect to
find on an island of 240mi2?
A. 3 species
B. 18 species
C. 21 species
D. 50,000 species
B
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Which of the following statements about spermatogenesis is false?
A. Sperm are motile as soon as they are produced. B. Secondary spermatocytes and spermatids are linked together by cytoplasmic bridges. C. Spermatogenesis takes 2–3 months. D. Sperm are produced continuously within the seminiferous tubules. E. None of the answer options is false.
Regions of a specimen with higher electron density scatter ________ electrons and, therefore, appear ________ in the image projected onto the screen of a transmission electron microscope.
A. fewer; lighter B. more; lighter C. fewer; darker D. more; darker
Which of the following is a eukaryote involved in foodborne illness?
A) Toxoplasma gondii B) Campylobacter jejuni C) Listeria monocytogenes D) Yersinia enterocolitica E) Naegleria fowleri
The random change in frequency of a genetic variant in a population is called
a. negative selection. b. gene conversion bias. c. purifying selection. d. genetic drift. e. positive selection.