The earliest land plants appeared in the fossil record:
A. about 500 million years ago
B. about 300 million years ago
C. about 100 million years ago
D. a billion years ago
E. about 10 million years ago
A. about 500 million years ago
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Each of the following are denaturing agents except ________.
A. high pH B. high temperature C. low pH D. low temperature
The exposed, unmyelinated gaps between glia on myelinated axons are also sites of voltage-gated Na+ channels.
Answer the following statement true (T) or false (F)
Mitosis and meiosis are important processes for the survival of many animal species. If a horse's diploid number is 64, how many more chromosomes would a daughter cell produced by mitosis have than a daughter cell produced by meiosis?
A) 64 B) 32 C) 16 D) 128
Which of the following cytokines promotes the development of a cell-mediated immune response?
A. alpha interferon B. chemokines C. tumor necrosis factor (TNF) D. IL-4 (interleukin-4) E. IL-12