you are interested in studying a receptor and decide to make a knockout mouse. however, you notice severe developmental defects that result in embryonic lethality in the receptor knockout mice. which developmental process is most likely affected if the receptor is on the cell surface, and the knockout disrupts its ability to receive a signal and initiate a transduction pathway?

This organism is not capable of performing photosynthesis. (horseshoe crab) true false

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.