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Equal volumes of cell suspensions of Escherichia coli, Saccharomyces cerevisiae, Streptococcus lactis and Mycoplasma pneumoniae, all have the same OD600nm = 0.50. Which cell suspension would have the minimum and maximum number of cells, respectively?

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    $\begingroup$ Welcome to Bio.SE! What efforts did you make to answer this homework assignment? If you can't provide them, I'm afraid your question will be downvoted and closed. (see biology.stackexchange.com/help/homework) $\endgroup$ – LinuxBlanket Feb 6 '18 at 16:29
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Difficult to say with the information you have given. Here is a paper on the subject if you are interested. The relationship between OD and cell count depends on morphology and size, which in turn depend on culture condition, strain, etc...

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  • $\begingroup$ Based on size, and if this is a homework question, you might expect yeast to be the largest and Mycoplasma to be the smallest. $\endgroup$ – canadianer Feb 21 '18 at 18:25

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