Which of the following traits appeared at point 3 on the phylogeny above?
A. gap junctions
B. cell signaling
C. adhesion
D. bulk transport
E. differentiation of distinct cell types
A
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About what portion of all couples are affected by infertility?
A. Fewer than 1 percent B. About 3 percent C. About 8 percent D. About 13 percent E. Over 20 percent
Clavulinic acid is classified as a
A. Aminoglycoside B. beta-lactamase inhibitor C. macrolide D. beta-lactam
What do enzyme-linked receptors and growth factor receptors have in common?
A. Both regulate specific G proteins when bound to a hormone. B. Both regulate the transport of ions through channels. C. Both seldom affect the expression of genes within the nucleus. D. Both possess kinase activity when bound to a hormone. E. Both act as transcriptional factors.
Compared to urine, the filtrate that first enters a nephron tubule
A) contains less water. B) contains red blood cells. C) has more salts. D) does not contain urea.