The diagram shows a simple metabolic pathway.
W $\to$ X $\to$ Y $\to$ Z
The letters W, X, Y and Z represent four different substances. At each step in the diagram the substrate undergoes a chemical reaction catalysed by an enzyme. The reaction produces the next substance in the pathway. Which statements correctly describe the enzymes taking part in this metabolic pathway?
1- They are all globular proteins.
2- They all have the same tertiary structure.
3- They all contain hydrogen atoms in their structure.
1 )
1, 2 and 3
2 )
1 and 2 only
1 and 3 only
4 )
2 only
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