Which soil horizon has no organic matter or
weathered rock?
a. A
b. B
c. C
d. D
e. E
Answer: e
Biology & Microbiology
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Platelet-derived growth factor (PDGF) is a signaling molecule that functions in which of the following types of cell signaling?
A. juxtacrine B. paracrine C. autocrine D. endocrine E. All of these choices are correct.
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In order for a root to branch, new apical meristem must form from the ____ , a single layer of cells inside the endodermis of the root
Fill in the blank with the appropriate word.
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In general, HPV causes
a. warts. b. pimples. c. moles. d. freckles. e. more than one of these.
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The release of testosterone requires
a. GnRH. b. luteinizing hormone. c. Sertoli cells. d. GnRH and luteinizing hormone. e. GnRH, luteinizing hormone, and Sertoli cells.
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