Catabolic Pathways That Break Down Complex Substances into More Usable

question 24

Multiple Choice

Catabolic pathways that break down complex substances into more usable units are usually regulated by the

• A)end products of the pathway.
• B)the levels of the molecule that is to be broken down.
• C)other metabolites that are limiting.
• D)other enzyme binding..

---

Definitions:

Neurotransmitter

Chemical substances that transmit nerve impulses across a synapse from one neuron to another.

Synaptic Vesicles

Membrane-bound sacs within the neuron that store neurotransmitters, which are chemicals involved in transmitting messages across the synaptic gap.

Resting Potential

The electrical charge of a neuron when it is not active or transmitting an impulse, representing the difference in electric potential across the neuron's membrane.

All-Or-None

Referring to the fact that a neuron either fires completely or does not fire at all.