Gproteins and g-protein-linked receptors g proteins and g-protein-linked receptors are thought to have evolved very early, because of their similar structure and function in a wide variety of modern organisms. are found only in bacterial cells, embedded in the cell's plasma membrane only. are not widespread in nature and were unimportant in the evolution of eukaryotes. probably evolved from an adaptation of the citric acid cycle. are found only in animal cells, and only embedded in or located just beneath the cell's membrane.

Select all the correct answers. which statements fail to meet the requirements of a scientific claim? a). in the final 100 meters of a 10,000-meter race, an athlete's speed is more strongly related to anaerobic efficiency than to aerobic efficiency. b). flowers that reflect the most ultraviolet light are more likely to attract bees and other pollinators than flowers that reflect less ultraviolet light. c). the evidence supporting newton's laws of motion was accurate in newton's time, but the universe operates differently today. d). even though evidence indicates that the solar system's planets follow elliptical paths, copernicus's model involving circular orbits is true.