Which statement best describes a relationship between enzymes and a simple biological reaction? a) enzymes will increase the amount of substrate formed during a biological reaction. b) enzymes will decrease the amount of substrate formed during a biological reaction. c) a reaction rate can be increased when the specific enzyme for a biological reaction is present. d) a reaction rate can be decreased when multiple enzymes for a biological reaction are present.

The Option C is correct.

By increasing the enzyme concentration, the maximum reaction rate greatly increases.

Conclusions:

The rate of a chemical reaction increases as the substrate concentration increases. Enzymes can greatly speed up the rate of a reaction. However, enzymes become saturated when the substrate concentration is high.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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