Which Statement About Signaling Within Organisms Is True

question 151

Multiple Choice

Which statement about signaling within organisms is true?

• A) Intercellular communication occurs in bacteria using hormones.
• B) Sponges lack both a nervous system and chemical signaling among cells.
• C) Over the course of evolution, the structures of chemical signals have been conserved, but their functions have evolved.
• D) Plants lack both a nervous system and chemical signaling among cells.
• E) Particular hormones are typically confined to specific taxa.

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Definitions:

Dendritic Morphology

The study of the structure and form of dendrites, which are the branched projections of a neuron.

New Connections

Refers to the formation of novel synaptic connections between neurons in the brain, a process associated with learning and memory.

Synapses

The junctions between neurons through which signals are transmitted; they can be chemical, involving neurotransmitter release, or electrical, through direct ion flow.

Circuitry

The arrangement and interaction of electrical components and pathways through which electrical current flows.