★ Must-know
📌 Eukaryotic cell organelles are classified as nonmembranous, one-membrane, or two-membrane structures.
Further detail
Membranous organelles are enclosed; nonmembranous organelles are not.
1. Which classification best describes the major categories of eukaryotic cell organelles?
2. Which set contains components of the eukaryotic endomembrane system?
3. What structural feature distinguishes rough endoplasmic reticulum from smooth endoplasmic reticulum?
How are eukaryotic cell organelles classified by membrane number?
As nonmembranous, one-membrane, or two-membrane structures.
Which structures are nonmembranous in eukaryotic cells?
Ribosomes, microtubules, microfilaments, and chromosomes.
What organelles are included in the endomembrane system?
The nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, and plasma membrane.
What is the endoplasmic reticulum?
A convoluted membranous network extending from the nuclear surface through much of the cytoplasm.
How does the endoplasmic reticulum's membrane surface compare to the plasma membrane?
It has up to 30 times greater membrane surface than the plasma membrane.
What distinguishes rough endoplasmic reticulum from smooth endoplasmic reticulum?
Rough ER has membrane-bound polyribosomes; smooth ER lacks attached ribosomes.
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