You have inoculated a Clostridium species into a tube of media. After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe. What is the best explanation for the observed lack of growth?

presence of oxygen

Explanation:

An obligate anaerobe organism is one that can only survive in an environment that is devoid of oxygen. If such organism is cultured in the presence of oxygen, it will refuse to grow.

The Clostridium must have been incubated in an oxygen-rich environment. Hence, its refusal to grow.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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