Read the following statements and choose the correct option 1. Acquired immunity in higher vertebrates is memory-based and enables the distinction between self-cells and foreign organisms. 2.Autoimmune diseases occur when the immune system fails to differentiate between self-cells and foreign organisms. 3.Experimental immunology largely focuses on understanding the basis of autoimmune diseases. 4.Rheumatoid arthritis

Step-by-step solution

Memory-based acquired immunity evolved in higher vertebrates based on the ability to differentiate foreign organisms (e.g., pathogens) from self- cells. While we still do not understand the basis of this, two corollaries of this ability have to be understood. One, higher vertebrates can distinguish foreign molecules as well as foreign organisms. Most of the experimental immunology deals with this aspect. Two, sometimes, due to genetic and other unknown reasons, the body attacks self-cells. This results in damage to