Imagine That a Researcher Discovers a New Type of Organelle

question 93

Multiple Choice

Imagine that a researcher discovers a new type of organelle in single-celled eukaryotes. She suspects this new organelle is the result of endosymbiosis. How could she support this theory?

• A)She could use electron microscopy to determine if any structural similarities exist between this new organelle and prokaryotic cells (i.e., like proteobacteria or cyanobacteria).
• B)She could determine whether this organelle has both an inner and outer membrane.
• C)If this organelle has its own DNA, she could compare its genetic sequence to those of certain prokaryotes.
• D)All of these choices are correct.

---

Definitions:

Endogenous Opiates

Naturally occurring chemicals in the body that reduce pain, enhance pleasure, and play a role in the stress response, similar to opioids.

Spinal Cord

A long, thin, tubular structure made up of nervous tissue, which extends from the brain and is encased within the vertebral column.

Acetylcholine

A neurotransmitter in both the central and peripheral nervous systems that plays a crucial role in muscle movement and cognitive functions.

Adrenaline

Also known as epinephrine, a hormone and neurotransmitter that increases heart rate, contracts blood vessels, dilates air passages, and participates in the fight-or-flight response of the sympathetic nervous system.