All of the following are true facts about enzymes except
a)
all living cells have enzymes.
b)
life would not be possible without enzymes.
c)
enzymes can speed chemical reactions by 100s to millions of times.
d)
there are a few types of enzymes, but they each perform many types of reactions.

The answer to this question would be: D)there are a few types of enzymes, but they each perform many types of reactions.
Enzyme is vital for a living since it will speed up the chemical reaction rate. This will help much in making and processing energy. But enzyme works like lock and key, which means that a specific enzyme will help specific reaction.

The correct option is D.
Enzymes are biological catalysts which speed up the rate of biochemical reactions in the system of living organisms. There are many types of enzymes and  enzymes are very specific about the type of biochemical reaction they catalyze. Enzymes only catalyze specific chemical reactions; for instance, the enzyme lactase catalyze the breaking down of lactose to glucose. This enzyme will not catalyze any other biochemical reaction except the conversion of lactose to glucose.

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Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.