Multiple Choice
In prokaryotic cell architecture, what structure functions as the cell’s control center by housing the bacterial chromosome and regulating gene expression?
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1. Overview of Cell Biology
Prokaryotic Cell Architecture
Multiple Choice
In prokaryotic cell architecture, what is the sedimentation coefficient (size) of the bacterial ribosome?
A
40S
B
70S
C
80S
D
60S
Verified step by step guidance1
Understand that the sedimentation coefficient (Svedberg unit, S) is a measure of how fast a particle sediments during centrifugation, which correlates with its size and shape.
Recall that ribosomes in prokaryotic cells differ from those in eukaryotic cells in their sedimentation coefficients.
Know that prokaryotic ribosomes are composed of two subunits: a smaller 30S subunit and a larger 50S subunit.
Combine the two subunits to get the total sedimentation coefficient of the bacterial ribosome, which is not a simple sum but a characteristic value.
Recognize that the combined sedimentation coefficient of the bacterial ribosome is 70S, distinguishing it from the 80S ribosomes found in eukaryotic cells.
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