Atransition state analog: a. typically yields product more rapidly with an enzyme than the normal substrate. b. is less stable than the normal substrate when binding to an enzyme c. stabilizes the transition state for the normal enzyme-substrate complex d. resembles the transition-state structure of the normal enzyme-substrate complex

A scientific question is one which can be tested using a set of experiments and comparing with a control variable. Out of the given questions, the nonscientific questions are:

"Why do people in my neighborhood have more cats than dogs?"

"How can the position of the stars and planets be used to predict the future?"

Both of these questions can not be answered through the scientific method, so they are nonscientific.