transports them to different body tissues and recycles id toWhich actively them

Question

transports them to different body tissues and recycles id toWhich actively them at the kidney glomerulus to prevent their loss and prolong their half-lives. 5.10 Multiple Choice: Which of the following is not true concerning the evolutionary history of the adaptive immune system? A. Adaptive immunity arose abruptly in evolution. B. Fruitlies and mosquitoes exhibit diversity in the secreted Dscam protein by alternative splicing of a vast array of different exons, while freshwater snails exhibit diversity in FREP genes by differential accumulation of genomic mutations in these genes. C. Jawless fish recombine VLR genes during DNA replication to engender diversity in these genes, which are expressed on lymphocytes and have GPl-anchored and secreted forms. D. RAG-1 arose from transposases while the RSSs it recognizes arose from terminal repeats from DNA transposons. E. MHC class I and class II genes arose before T cells and immunoglobulins in cartilaginous fish.

Explanation / Answer

Of the given options, all are true except for A. Adaptive immune response did not abruptly arise during evolution. adaptive immune system have been found in ogranisms from Bacteria to humans.

Both adaptive and innate responses are used by all organisms. Innate response provides basic protection and is non specific where as adaptive response highly specific and provides a long-lasting protection. In most organism, both immune responses are found to have coevolved.

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