Which of the following is an example of a commensalism?
A) fungi residing in plant roots, such as endomycorrhizae
B) bacteria fixing nitrogen in plants
C) rancher ants that protect aphids in exchange for sugar-rich honeydew
D) cattle egrets eating insects stirred up by grazing bison
Answer: D
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Severe combined immune deficiencies (SCID) affect both
A) humoral and cellular immunity. B) white blood cells and red blood cells. C) mast cells and macrophages. D) helper B cells and cytotoxic B cells.
__________ allow animals of the same species to share information Fill in the blank(s) with the appropriate word(s)
Human viruses can enter human cells by fusion with the cell membrane or by:
a. diffusion into the cell. b. passage through specific protein channels. c. coating themselves with lipids that cloak their entrance into the cell. d. endocytosis. e. hitchhiking onto protein signals entering the cell
On March 10, 2004, National Public Radio reported that "forests in a remote part of the Amazon are suddenly growing like teenagers in a growth spurt." Though, the radio report added, "This shouldn't be happening in old, mature forests." This unexpected growth could be caused by:
What will be an ideal response?