INTRODUCTION TO MICROSCOPY CELL BIOLOGY
MICROSCOPY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ribosomes consist of two subunits, each containing rRNA. An analysis of all the 70S ribosomes from a single cell of the bacterium, Escherichia coli, showed that there were:* 38 000 rRNA molecules * 2 main types of rRNA molecule * 19 000 copies of each type of rRNA molecule How many 70S ribosomes were there in the E. coli cell?
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9500
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19000
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38000
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76000
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Explanation:
Detailed explanation-1: -The nucleolus is a spherical structure found in the cell’s nucleus whose primary function is to produce and assemble the cell’s ribosomes.
Detailed explanation-2: -In E. coli growing at a rate of one doubling per h, the number of ribosomes per cell is 13, 500 during log phase (4) and decreases to 4, 100 during late log phase, 3, 500 at the onset of starvation, and 25 after 24 h of starvation (26).
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