practice exam 3
Subject:
Biology [1]
Practice exam III 1. In signal transduction pathways for hydrophilic ligands a key function occurring at the plasma membrane is: a. To allow the ligand to pass across the membrane. b. To have a protein receptor specifically bind the ligand. c. To stop the signal transduction from occurring across the membrane into the cytoplasm. d. To prevent the membrane receptor from moving laterally in the phospholipids layer. 2. Find the correct match of ligand and molecule: a. Nitric oxide : small peptide. b. acetylcholine : polypeptide. c. gibberelic acid : gas. d. epinephrine : small amine. D 3. Which of the following are not used in cell signaling as a ligand, or part of the signal transduction pathway? a. Gap junctions. b. Plasmodesmata.