which of the following is the best evidence that cell communication evolved early in the history of living things? from plant cell to mammalian cells, they all have microtubules and actin fikaments
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Answer:
Explanation: A. From plant cells to mammalian cells, they all have microtubules and actin filaments B. From bacteria to humans, different organisms share some common signaling mechanisms at the cellular level. c. They have receptors on the external surface of the cell membrane D. From bacteria to humans, different organisms share some common metabolic pathways. 2. Which of the following is false regarding cell signaling? A. Transmembrane receptors are usually ion channels b. Transmembrane receptors are usually found on the plasma membrane C. Cell signaling can be over long range or short distance. D.A signaling molecule can be polar or nonpolar 3. Sodium ions move from one cardiac muscle cell to an adjacent cell via a gap junction causing them to contract in unison. This is an example of a. contact-dependent signaling. b. autocrine signaling. c. channel signaling. d. paracrine signaling.