What is the function of melatonin?
A. regulate blood glucose levels
B. control the color of the skin
C. aid in the differentiation of T lymphocytes
D. regulate blood calcium levels
E. control the daily sleep-wake cycle
Answer: E
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Macroscopic examination of granules from lesions of mycetoma reveals them to be white to yellow and 0.2 to 2 mm in diameter. Microscopically, the granules consist of loosely arranged, intertwined septate hyaline hyphae cemented together. Which organism can cause a mycetoma infection?
a. Fonsecaea spp. b. E. dermatitidis c. Cladosporium spp. d. P. boydii
Chart the path of sperm from production to exit from the body. What will be an ideal response?
If a fossil is encased in a stratum of sedimentary rock without any strata of volcanic rock (for example, lava or ash) nearby, then it should be _____
A) easy to determine the absolute age of the fossil, because the radioisotopes in the sediments will not have been "reset" by the heat of the igneous rocks B) easy to determine the absolute age of the fossil, because the igneous rocks will not have physically obstructed the deposition of sediment of a single age next to the fossil C) difficult to determine the absolute age of the fossil, because the "marker fossils" common to igneous rock will be absent D) difficult to determine the absolute age of the fossil, because radiometric dating of sedimentary rock is less accurate than that of igneous rock
Which of the following is the marine organism credited with being the transition organism between the aquatic arthropods and the land dwellers?
a) scorpion b) centipede c) dragonfly d) horseshoe crab e) blue crab