You have just measured the OD of your E. coli (which is in log-phase growth) and it is at 0.15. You are doing a procedure that requires you to centrifuge E.coli once it reaches an OD of 1.20 do you have time to run to the bathroom? In other words, (i)  explain the logic, and (ii) show the math to illustrate how you know what time you need to return to lab to centrifuge those bacterial cells.

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Modes of Nutrition

It is a biological process of providing or obtaining food that is necessary for growth and health. It includes many physiological processes - absorption, ingestion, assimilation, catabolism, excretion, etc. In biology, the science that deals with nutrition's physiological and chemical processes are called "nutritional science."