In a certain mutant strain of bacteria, an enzyme mistakenly attaches the amino acid isoleucine to tRNA 10% of the time instead of attaching the amino acid leucine. What will these bacteria synthesize? A.
no proteins, because the inappropriately activated tRNAs will block translation
B.
proteins in which isoleucine is inserted at some positions normally occupied by leucine
C.
proteins in which leucine is inserted at some positions normally occupied by isoleucine
D.
no abnormal proteins, because the ribosomal translation machinery will recognize the inappropriately activated tRNAs and exclude them from the translation process

Monarch butterflies have brightly colored orange wings with black patterns on them, making them easily visible to birds that eat butterflies and moths, yet birds rarely eat the monarchs. likewise, the monarch caterpillars are brightly striped yellow and white and black, and they also are rarely eaten by birds, although some wasps will attack them and feed them to their young. what can be inferred from these observations? monarchs must threaten and attack birds, but not wasps. monarchs have a way of discouraging bird predation that does not involve hiding. monarchs’ wings are so colorful that most birds must find them difficult to eat. monarchs lay more eggs than other less conspicuous butterflies.