If a Host Cell Expresses Both MHC Class I Molecules

question 7

Multiple Choice

If a host cell expresses both MHC class I molecules and ligands that bind activating receptors on NK cells, what is the outcome for the host cell?

• A) The host cell will not be killed because the NK cell needs two different activating signals to kill a host cell.
• B) The host cell will not be killed because the MHC class I molecules cause inhibition that overrides the activating signals.
• C) The host cell will be killed because the NK cell does not bind MHC class I molecules and the activating signal causes cell death.
• D) The host cell will be killed because the activating signal overrides the inhibitory signal caused by the MHC class I molecule binding.

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Definitions:

Sensory-Neural Deafness

A type of hearing loss that occurs due to damage to the inner ear or the nerve pathways from the inner ear to the brain.

Central Deafness

A type of hearing loss which is caused by damage to the central nervous system rather than the ear itself.

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Specialized cells located on the taste buds of the tongue that detect chemical substances in food, allowing the perception of taste.

Papillae

Small protrusions on the surface of the tongue that contain taste buds and aid in the sensation of taste.