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}

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

A) homocysteine ?methionine
B) methionine ?homoserine
C) homoserine ?cysteine
D) cysteine ?cystathionine
E) cystathionine ?homocysteine

Describe the Difference Between Incomplete Penetrance and Variable Expressivity

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