Extracellular Messengers Binding on Surface Receptors May Exert Effects on Cells

question 64

Multiple Choice

Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:

• A) opening gated channels.
• B) opening a gated channel through activation of a G protein.
• C) activation of the adenylyl cyclase system.
• D) binding to sites and then being endocytized.
• E) ultimately activating protein kinases.

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Definitions:

Impermeable Unit

A geological formation that does not allow fluids to pass through it due to its material composition or structure.

Fault Zone

An area of multiple fractures or breaks in the Earth's crust caused by tectonic forces, associated with earthquakes and volcanic activity.

Unconformity

A geological feature that represents a break or gap in the Earth's sedimentary record, often caused by periods of erosion or lack of deposition before more sediment is laid down.

Petroleum

A liquid mixture of hydrocarbons present in certain rock strata, used primarily as a fuel source.