Indicate true (T) and false (F) statements below regarding bacterial and viral evolution. Your answer would be a four-letter string composed of letters T and F only, e.g. FFFT.
( ) Bacteria that reside in natural soil that has not been deliberately exposed to antibiotics are normally sensitive to any antibiotic.
( ) Whereas bacterial and eukaryotic pathogens evade the immune response mainly by genetic recombination, antigenic variation in most viruses occurs by error-prone replication mechanisms.
( ) If an antibiotic targets a vital bacterial protein that cannot be altered in any way to become antibiotic-resistant and functional at the same time, the bacteria would never develop resistance to the antibiotic.
( ) It is impossible to develop effective vaccines against viral infections, since viruses evolve very rapidly.