Multiple Choice
Lipopolysaccharide (LPS) is an important cell envelope component characteristic of which type of prokaryotic cell wall?
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1. Overview of Cell Biology
Prokaryotic Cell Architecture
Multiple Choice
In prokaryotic cell architecture, do prokaryotic cells contain ribosomes, and if so, what type?
A
Yes; they contain 80S ribosomes attached to the rough endoplasmic reticulum.
B
Yes; their ribosomes are membrane-bound inside mitochondria.
C
No; prokaryotic cells lack ribosomes because they do not have a nucleus.
D
Yes; they contain 70S ribosomes in the cytoplasm.
Verified step by step guidance1
Recall the basic structural features of prokaryotic cells, noting that they lack membrane-bound organelles such as the nucleus, mitochondria, and endoplasmic reticulum.
Understand that ribosomes are essential for protein synthesis and are present in all living cells, including prokaryotes.
Identify the type of ribosomes found in prokaryotic cells by comparing their size and sedimentation rate to those in eukaryotic cells; prokaryotic ribosomes are smaller and designated as 70S.
Recognize that prokaryotic ribosomes are free-floating in the cytoplasm rather than being attached to membranes, since prokaryotes lack internal membrane-bound organelles.
Conclude that the correct description is that prokaryotic cells contain 70S ribosomes located in the cytoplasm, not 80S ribosomes or membrane-bound ribosomes.
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