这很重要，因为酶的氨基酸序列是由基因决定的。
This is significant, because the amino acid sequence of an enzyme is determined by genes.
许多科学家曾经认为，同卵双胞胎在外貌上的相似是由基因决定的，而他们之间的性格、智力和其他差异则是受到环境的影响。
Many scientists once believed that physical similarities between identical twins are genetic, while their personalities, intelligence and other differences between them are an effect of their environment.
国民性格毕竟不是由基因决定的。
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