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12.3A: Major Histocompatibility Complex (MHC) Molecules - Biology

Learning ObjectivesState which body cells display MHC-I surface molecules and which cells normally display MHC-II surface molecules.Define endogenous antigen and exogenous antigen and state which class of MHC molecule primarily binds each.State which type of T-lymphocyte recognizes epitopes from protein antigens on MHC-I molecules and which type recognizes epitopes from protein antigens on MHC-II molecules.
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Bacterial Diseases

Mycobacterium tuberculosis: Lung Tuberculosis-causing bacteria (Microscope image) Introduction Many types of bacteria that settle in the human body can cause disease. These bacteria can penetrate the human body in a variety of ways (body cuts, insect bites, contaminated food, air and water).
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12.5: Ribosomes and Protein Synthesis - Biology

Learning ObjectivesBy the end of this section, you will be able to:Describe the different steps in protein synthesisDiscuss the role of ribosomes in protein synthesisThe synthesis of proteins consumes more of a cell’s energy than any other metabolic process. In turn, proteins account for more mass than any other component of living organisms (with the exception of water), and proteins perform virtually every function of a cell.
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