| The diagram represents a sequence of reactions taking place in a bacterium in which amino acids are produced from one another by the action of specific enzymes. Number 1 to 6 represent different amino acids, letters V to Z represent different enzymes. All the amino acids are essential for survival. |
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| The original strain of the bacterium required only amino acid 1. A mutant strain of this bacterium could only survive when produced with amino acids 1, 2 and 5 in its culture medium. |
| Which enzymes were missing in the mutant strain? |
A) V and Z
B) W and Z
C) X and y
D) V, W and Z
Correct Answer: A
Solution :
The enzyme Vis responsible for making amino acid 2 from 1, whilst Z is responsible for the conversion of 4 to 5. These two enzymes V and Z were thus absent in mutant strain.
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