Which of the Following Is NOT an Example of a Checkpoint

question 10

Multiple Choice

Which of the following is NOT an example of a checkpoint in lymphocyte maturation that contributes to the selective maturation of cells with useful antigen receptors?

• A)B cell precursors that cannot express Ig g heavy chains die by apoptosis.
• B)T cell precursors that cannot express TCR b chains die by apoptosis.
• C)Immature B cells that bind to self antigen with high affinity die by apoptosis.
• D)Developing T cells that fail to express TCR a chains die by apoptosis.
• E)Developing T cells that recognize self major histocompatibility complex (MHC)molecules with high affinity die by apoptosis.

---

Definitions:

Dopamine

A neurotransmitter in the brain that plays a key role in regulating mood and reward-motivated behavior.

Cocaine

A powerful stimulant drug derived from the leaves of the coca plant, known for its potential to cause dependence and severe health issues.

Reuptake

The process by which neurotransmitters are taken back into neurotransmitter vesicles after they have been released into the synapse.

Fatal Overdose

The ingestion of a substance in quantities greater than are recommended or generally practiced, resulting in death.