Final answer:
Mark may have left out the critical role of proteins in the immune response, as they are vital for producing antibodies to fight against pathogens.
Step-by-step explanation:
Mark may have omitted the significant function of proteins in immune response. Proteins are crucial for the immune system, as they are involved in the production of antibodies that bind to specific foreign particles, such as viruses and bacteria, to neutralize them. Without these proteins, the body would not be able to defend itself against pathogens effectively.
In addition to their role in the immune response, proteins have a diverse range of functions, including as enzymes that catalyze chemical reactions, transport proteins like hemoglobin that carry substances throughout the body, structural support in cells and tissues, and in cell signaling and regulatory functions.
Given the versatility and necessity of proteins in nearly all biological processes, it is crucial to recognize and understand the wide array of roles they play, including those not previously listed by Mark.