用于苯丙氨酸脱氨酶的阳性质控菌是（）
A.脆弱拟杆菌
B.产气肠杆菌
C.黏质沙雷菌
D.粪肠球菌
E.雷极变形杆菌
参考答案：E
解析：1.DNA酶试验的应用，在G+球菌中只有金黄色葡萄球菌产生DNA酶，在肠杆菌科中沙雷菌和变形杆菌产生此酶，可用于鉴定这些细菌。2.苯丙氨酸脱氨酶试验，用于肠杆菌科细菌的鉴定。变形杆菌属、普罗威登斯菌属和摩根菌属为阳性，肠杆菌科中其他细菌均为阴性。3.胆汁七叶苷试验，用于肠球菌与D群链球菌鉴别，前者阳性，后者阴性。
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