2. The pathways for the biosynthesis of the amino acidsglutamine (Gln) and proline (Pro) involve one or morecommon intermediates. Auxotrophic yeast mutantsnumbered 1–7 are isolated that require either glutamine or proline or both amino acids for their growth,as shown in the following table (+ means growth; −no growth). These mutants are also tested for theirability to grow on the intermediates A–E. What is theorder of these intermediates in the glutamine and proline pathways, and at which point in the pathways iseach mutant blocked?Gln +Mutant A B C D E Gln Pro Pro1 + − − − + − + +2 − − − − − − + +3 − − + − − − − +4 − − − − − + − +5 − − + + − − − +6 + − − − − − + +7 − + − − − + − +

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