Poliovirus receptors are found ________.
A. in cells of all tissues
B. in spinal cord anterior horn cells only
C. in gut cells only
D. in nasopharynx, gut, and spinal cord anterior horn cells
Answer: D
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Why are telomeres a necessary component of linear chromosomes?
A. They direct where DNA synthesis will begin. B. They fix mistakes that are made during DNA replication. C. They extend the life of cells because DNA is shortened every time it is replicated. D. They direct where DNA synthesis will end. E. None of the answer options are correct.
The most recent level of evolution in primates is considered to be in
a. brain expansion. b. behavior and culture. c. dentition. d. hand grip. e. daytime vision.
Which of the following structures begins in the dermis and extends to the surface of the epidermis?
A. hair follicles B. blood vessels C. nerve fibers D. free nerve endings
The Cerulean warbler is a songbird that breeds in the eastern and middle United States and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reason(s) for this rapid decline and set about to make observations and gather data. The graph above shows data you collected on the abundance of Brown cowbirds (nest parasites) and Cerulean warblers at various locations. Based on a visual inspection of the graph, what can you conclude?
A. Brown cowbird abundance is significantly correlated with Cerulean warbler abundance. B. The abundance of Brown cowbirds shows a positive relationship with Cerulean warbler abundance. C. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance. D. Brown cowbirds do not appear to affect Cerulean warblers. E. Brown cowbirds are responsible for the decline of the Cerulean warbler.