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

Biology & Microbiology

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About what portion of all couples are affected by infertility?

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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.

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Clavulinic acid is classified as a

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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.

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