The three-domain system
A) no longer recognizes eukaryotes as a monophyletic group.
B) subdivides the eukaryotes into two different domains.
C) subdivides the prokaryotes into two different domains.
D) separates plants, animals, and fungi into domains.
Answer: C
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A. endoplasmic reticulum B. Golgi apparatus C. mitochondria D. lysosome
All life on Earth is based on carbon chemistry
a. True b. False Indicate whether the statement is true or false
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.
Membrane phospholipids
A) have hydrophobic heads that face the center of the membrane and are shielded from water. B) have hydrophilic tails that face outward and are exposed to water. C) are able to drift about in the plasma membrane. D) remain fluid because they are tightly packed against one another.