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Multiple Choice
Which of the following is not a membrane-bound organelle?
A
Ribosome
B
Golgi apparatus
C
Mitochondrion
D
Endoplasmic reticulum
Verified step by step guidance
1
Understand the definition of a membrane-bound organelle: These are structures within a cell that are surrounded by a lipid bilayer membrane, which separates their internal environment from the cytoplasm.
Review the list of options provided: Ribosome, Golgi apparatus, Mitochondrion, and Endoplasmic reticulum.
Recall that the Golgi apparatus, mitochondrion, and endoplasmic reticulum are all membrane-bound organelles. They each have a distinct membrane that encloses their internal structures.
Consider the ribosome: Ribosomes are not surrounded by a membrane. They are composed of ribosomal RNA and proteins and are found either floating freely in the cytoplasm or attached to the endoplasmic reticulum.
Conclude that the ribosome is the only option that is not a membrane-bound organelle, as it lacks a surrounding lipid bilayer membrane.