The true statement with regard to recombinant DNA is:
c. Recombinant DNA is produced by pasting together DNA from two sources.
This statement accurately describes the process of creating recombinant DNA, which involves combining DNA molecules from different sources, usually to study gene function or produce proteins.
While the other options have some merits, they are not entirely accurate in the context of recombinant DNA itself. For example:
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a. Recombinant DNA is used to produce hundreds of other DNA products. (This is more of a consequence of using recombinant DNA rather than a definition or characteristic of it.)
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b. Recombinant DNA is larger than a typical chromosome. (Recombinant DNA can be of various sizes and is typically not larger than a chromosome, which contains a significant amount of genetic information.)
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d. Recombinant DNA can be found in fungus cells. (While recombinant DNA can theoretically be introduced into fungal cells, it is not naturally occurring in them; it is an artificially created form of DNA.)
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