第11题:[单选题] The grey building is the place where the workers live, and the white building is the place where the spare parts _________ . A.are producing B. are produced C. produced D. being produced 参考答案:B
第15题: [单项选择]在细胞内RNA分子中,下列分子所占比例最大的是() A. scRNA B. rnRNA C. rRNA D. tRNA E. snRNA 参考答案:C 答案解析:rRNA分子占全部RNA的80%,是构成核糖体的成分。此外,在细胞中还含有其他的RNA分子,如少量的核内小RNA(snRNA)和胞浆小RNA(scRNA)。