下列有关核酸与遗传物质关系的叙述，不正确的是（）A．DNA是

下列有关核酸与遗传物质关系的叙述，不正确的是（）

A．DNA是绝大多数生物的遗传物质

B．有的生物种类的遗传物质是RNA

C．在真核生物中，DNA和RNA都是遗传物质，其中DNA是主要的遗传物质

D．核酸是所有生物的遗传物质，其中DNA是主要的遗传物质

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