The two main classes of molecular switches include changes in phosphorylation state or changes in guanine nucleotide binding. In this regard, do you think that protein kinases and guanine nucleotide exchange factors (GEFs) always turn proteins on (activate) and protein phosphatases and GTPase activating proteins (GAPs) always turn them off?

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?