Osteocytes are found in the central canal of an osteon.
a. true
b. false
Answer: b. false
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Which of the following is a characteristic of mollusks in the class Polyplacophora?
a. a broad, ventral foot b. two pairs of nephridia c. vivid coloration d. hinged valves
cIn the spiral staircase model of DNA, the handrails
are a. covalent bonds. b. hydrogen bonds. c. nucleotide base pairs. d. phosphate and deoxyribose groups. e. composed of all of these.
A farmer's land includes a wilderness area that is home to an endangered species of bird. He wants to sell the land to a developer, and you have been hired to evaluate the environmental concerns. "This little patch of land is not crucial for the bird species!" the farmer says, "In fact, my land is surrounded by several other wilderness patches that also have that bird." You reply: "It is possible that your land acts as the ________ and the other areas are ________. If that's the case, development would be devastating to the population."
A. sink; sources B. metapopulation; population C. source; sinks D. population; metapopulation
Please choose the answer that best fills in the blanks of this sentence in the correct order. Immunodeficiency diseases that are congenital (present at birth) and genetic in origin are referred to as _______ immunodeficiency diseases, whereas those that are acquired during an individual's lifetime and are not genetic in origin are referred to as _______ immunodeficiency diseases.
A) Innate; adaptive B) Secondary; primary C) Primary; secondary D) True; opportunistic