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Which Step Is Catalyzed by the Enzyme Responsible for the Met

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Which step is catalyzed by the enzyme responsible for the Met 2 mutant?  Growth Medium  Mutant strain  Minimal medium Minimal+cysteine  Minimal+cystathionine Minimal+ homocysteine  Minimal+ methionine Compound accumulating in mutant Controlprototroph +++++None  Met 1+ Homocysteine  Met 2++ Cystathionine  Met 3+++ Cysteine  Met 4++++ Homoserine \begin{array} { l } \text { Growth Medium }\\\hline \begin{array} { l } \text { Mutant }\\ \text {strain }\\\end{array}&\begin{array} { l } \text { Minimal}\\ \text { medium}\\\end{array}&\begin{array} { l } \text { Minimal+}\\ \text {cysteine }\\\end{array}&\begin{array} { l } \text { Minimal+}\\ \text {cystathionine }\\\end{array}&\begin{array} { l } \text {Minimal+ }\\ \text {homocysteine }\\\end{array}&\begin{array} { l } \text { Minimal+}\\ \text { methionine}\\\end{array}&\begin{array} { l } \text { Compound}\\ \text { accumulating}\\ \text { in mutant}\\\end{array}\\\hline\begin{array} { l } \text { Control}\\ \text {prototroph }\\\end{array}&+&+&+&+&+& \text {None }\\\text { Met } 1&-&-&-&-&+&\text { Homocysteine }\\\text { Met } 2&-&-&-&+&+&\text { Cystathionine }\\\text { Met } 3&-&-&+&+&+&\text { Cysteine }\\\text { Met } 4&-&+&+&+&+&\text { Homoserine }\\\end{array}
 Which step is catalyzed by the enzyme responsible for the Met 2 mutant?  \begin{array} { l  } \text { Growth Medium }\\ \hline \begin{array} { l  }   \text { Mutant }\\ \text {strain }\\ \end{array}&\begin{array} { l  }   \text { Minimal}\\ \text { medium}\\ \end{array}&\begin{array} { l  }   \text { Minimal+}\\ \text {cysteine }\\ \end{array}&\begin{array} { l  }   \text { Minimal+}\\ \text {cystathionine }\\ \end{array}&\begin{array} { l  }   \text {Minimal+ }\\ \text {homocysteine }\\ \end{array}&\begin{array} { l  }   \text { Minimal+}\\ \text { methionine}\\ \end{array}&\begin{array} { l  }   \text { Compound}\\ \text {  accumulating}\\ \text {  in mutant}\\ \end{array}\\ \hline \begin{array} { l  }   \text { Control}\\ \text {prototroph }\\ \end{array}&+&+&+&+&+& \text {None }\\ \text { Met } 1&-&-&-&-&+&\text { Homocysteine }\\ \text { Met } 2&-&-&-&+&+&\text { Cystathionine }\\ \text { Met } 3&-&-&+&+&+&\text { Cysteine }\\ \text { Met } 4&-&+&+&+&+&\text { Homoserine }\\ \end{array}     A)  homocysteine  ?methionine B)  methionine  ?homoserine C)  homoserine  ?cysteine D)  cysteine ?cystathionine E)  cystathionine  ?homocysteine


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