What signaling pathway commonly makes use of a G protein to transduce the signal?
A. Channel-linked receptor pathways
B. Steroid hormone receptor pathways
C. Receptor tyrosine kinase pathways
C. Receptor tyrosine kinase pathways
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The critical concentration for tubulin polymerization is the concentration of
A) tubulin dimers at which all dimers assemble into microtubules. B) unassembled tubulin dimers when assembly is balanced with disassembly. C) tubulin dimers at which dimers assemble onto microtubule minus ends but disassemble from plus ends. D) unassembled tubulin dimers when there is net disassembly of dimers from both microtubule ends. E) tubulin dimers in most cells.
Homo heidelbergensis is believed to be the ancestor species of
A) Homo sapiens. B) Homo neanderthalensis. C) Homo neanderthalensis and Homo sapiens. D) Homo ergaster and Homo sapiens. E) Homo ergaster.
Which of the following is not an example of a detritivore?
A. arthropods B. worms C. fungi D. vultures
Which animal group is characterized by the absence of tails?
A) apes B) Old World monkeys C) New World monkeys D) lemurs