Multiple Choice
In a bacterium, which structure is primarily responsible for regulating the movement of substances into and out of the cell?
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1. Introduction to Microbiology
Introduction to Bacteria
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Which organelle is absent in Escherichia coli (E. coli)?
A
Nucleus
B
Ribosome
C
Flagellum
D
Cell membrane
Verified step by step guidance1
Understand that Escherichia coli (E. coli) is a prokaryotic organism, meaning it lacks membrane-bound organelles.
Recall that a nucleus is a membrane-bound organelle that contains the genetic material in eukaryotic cells, but is absent in prokaryotes like E. coli.
Recognize that ribosomes, although not membrane-bound, are present in both prokaryotic and eukaryotic cells and are essential for protein synthesis.
Know that flagella are present in many bacteria, including E. coli, and are used for motility.
Remember that the cell membrane is a fundamental structure present in all cells, including E. coli, serving as a barrier and controlling substance movement.
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