A part of an mRNA has the sequence CCG. Which change to this sequence would indicate a missense mutation? Phel TYT Cys His c Messenger Second base in codon RNA Codons C G UUU UCU UAU UGU U UUC UCC UAC UGC Ser UUA UCA Leu UAA Stop UGA Stop A UUG UCG UAG Stop UGG Trp G CUU CCU CAU CGU U CUC ССС CAC CGC Leu Pro Arg CUA CCA CAA CGA Gin CUGI CCG CAG CGG AUU 1 ACU AAU Asn AGU Ser AUC lle ACC AAC AGC Thr AUA АСА AAA AGA AUGM ACG AAG AGG) GUU GCU GAU GGU GUC GCC GAC) Asp GGC G Val Ala GUA GCA GAAT Gly Glu GGA GUG GCG GAG GGGI G First base in codon COOCOO Copos Third base in codon Lys Arg O A. CCC O B. CCA O C. CGG O D. CCU

Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.