I just wanted to get a thorough explanation for these answer choices and to see if they were correct. I am not sure about the exact mechanisms behind it. 1. Carbohydrates are the only class of molecules that are capable of activating the G protein-coupled receptors that transduce the sense of sweet taste. a. True b. False Does any ligand activate the receptor? It doesn't have to be carbs? 2. Both red blood cells and gastric parietal cells have chloride-bicarbonate symporters on their plasma membranes. a. True b. False Do RBCs carry bicarbonate? I'm not so sure about this. 3. Both compact bone and red bone marrow are types of connective tissues. a. True b. False Is compact bone not connective tissue? 4. Primary lymphoid tissues are the principal locations where immune cells interact with and eliminate pathogenic bacterial cells. a. True b. False Because primary lymphoid tissue is bone marrow and thymus? 5. Although T cell receptors (TCRs) bind to antigens with high affinity and specificity, antigen clumping is not associated with TCRs. a. True b. False Can antigen clumping occur? Not sure.

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