What unusual cellular characteristic does N. locustae share with the protist Mixotricha paradoxa, the organism discussed in the article "A Russian Doll of Symbiosis?"

Both N.locustae and protist Mixotricha paradoxa do not have a mitochondria.

The mitochondria is a basic cell organelle that palys the role of energy generation for the cell.this energy generated is in the form of ATP.

The organism N. locustae tends to rely on it's host cell that is that grasshopper. This host cell is that in which N. locustae replicates inorder to get a supply of energy.

On the other hand,the organism Mixotricha paradoxa relies on the bacteria endosymbionts to be able to supply it with energy.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products