下列有关根瘤菌及其生物固氮方面的叙述中正确的是a制备根瘤菌dna时需用纤维素酶处理细胞壁b根瘤菌的固氮基因编码区含有内含子和外显子c Template




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tomski下列有关根瘤菌及其生物固氮方面的叙述中正确的是a制备根瘤菌dna时需用纤维素酶处理细胞壁b根瘤菌的固氮基因编码区含有内含子和外显子c coloring