英语翻译several mutants are isolated,allof which require com-pou

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英语翻译
several mutants are isolated,allof which require com-pound G for growth.The compounds (A to E) in the biosymthetic pathway to G ate known,but their order in the pathway is not known.Each compound id tested for its ability to support the growth of each mutant(1 to 5).In the following table,a plus sign indicates growth and a minus dign indicates no growth.
a.what is the order of compounds A to E in the pathway?
b.At which point in the pathway is each mutant blocked?
c.would a heterolaryon composed of double mutants 1,3 and 2,4 grow on a minimal mediUm?Would 1,3 and 3,would 1,2 and 2,4 and 1,

许多突变体是孤立的,它们都需要化合物G才能生长.化合物A到E已知是化合物G合成途径的中间物质,但是在它们合成途径的位置顺序未知.所有化合物对突变类型1到5的促进生长的作用都被测试过了.在下面的表格中间,+表示促进生长,-表示不能促进生长.
请回答：A.化合物A到E在合成途径的顺序怎么样?
B 在哪一点上阻断对所有突变类型均有效?
C 假如有一个异核的双突变体例如1和3 或者2和4 可以在基本培养基上生长吗?假如说是1,3或者是3,4或者是1,2或者是2,4或者是1,4类型的异核双突变体呢?
(有一些单词打错了,根据上下文意思推测)

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