题目

News Spotlight Are you worried about finding a good job or even any job? Nervous about paying for college? Afraid that a parent may get laid off? (out of work) If so，you are not along．A Teens Health Survey found that most teens worry about the economy．The good news is， teens also seem realistic about the future and aren’t overly stressed out(过度紧张) about the current financial situation．And most are willing to face bravely to the tough economic times by finding a positive side to use less and save more．Some are even able to find a positive side to what’s going on下列关于蛋白质的叙述中，不正确的是A．不同蛋白质分子具有相同的肽键结构B．不同蛋白质分子的氨基酸序列一定不同C．只有一条肽链的蛋白质分子至少含有一个氨基D．蛋白质结构多样性决定其功能多样性