Most of the oxygen found in the blood is ____
a. bound to hemoglobin
b. dissolved in the plasma
c. dissolved in platelets
d. bound to albumin
e. bound to copper
ANSWER: a
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What do enzyme-linked receptors and growth factor receptors have in common?
A. Both possess kinase activity when bound to a hormone. B. Both regulate specific G proteins when bound to a hormone. C. Both act as transcriptional factors. D. Both regulate the transport of ions through channels. E. Both seldom affect the expression of genes within the nucleus.
The average number of sperm that enter the
vagina during an ejaculation is between
a. 150,000 and 350,000. b. 1.5 and 3.5 million. c. 15 and 35 million. d. 150 and 350 million. e. 1.5 and 3.5 billion
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.
After a haploid spore germinates, if then complete mitosis, forming hyphae. The resulting hyphae are
A. diploid. B. dikaryotic. C. zygotes. D. gametes. E. haploid.