Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: Collision frequency is greater for homogeneous category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'.
[A]: Collision frequency is greater for what category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'?


[Q]: The properties of the alkali metals are similar to each other as expected for elements in the same family.
[A]: The properties of the alkali metals are similar to each other as expected for elements in the same what?


[Q]: Muscarinic receptors can cause both depolarization or hyperpolarization depending on the subtype.
[A]:
Muscarinic receptors can cause both depolarization or hyperpolarization depending on the what?