carboxyl terminal residue

例句：

1. 1.The protein contains a carboxyl terminal residue that affects its function.
   这个蛋白质含有一个影响其功能的羧基末端残基。
2. 2.The amino acid sequence of this protein is crucial for its biological activity.
   这种蛋白质的氨基酸序列对其生物活性至关重要。
3. 3. The researcher discovered a new mechanism by which the enzyme modifies its substrates.
   研究者发现了一种酶如何修改其底物的新机制。