The electron transport chain occurs in the ________ of the mitochondria
Fill in the blank(s) with correct word
inner membrane
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Which of the following statements about cell signaling is correct?
A. Signaling pathways and the molecules involved (e.g., kinases) evolved before the evolutionary split between plants and animals and thus are similar in the two groups. B. Molecular mechanisms for communication between cells occurs in complex multicellular organisms, but not single-celled eukaryotes. C. All animals have gap junctions to allow for targeted signaling between cells. D. Signaling molecules are generally polysaccharides that activate receptors on target cells and activate or repress gene expression. E. Only cells on the exterior surface of an organism have receptors to detect environmental signals.
Which of the following organisms belong to the supergroup Excavata?
A. euglenids, amoeboids, and cellular slime molds B. diplomonads, euglenids, and diatoms C. diplomonads, euglenids, and parabasalids D. foraminiferans, radiolarians, and fungi
DNA that is circular and apart from the chromosome in a prokaryote is a(n)
A) nucleus. B) plasmid. C) nucleoid. D) ribosome. E) endospore.
A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n)
A) ecosystem. B) population. C) biosphere. D) community. E) biome.