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Critical Thinking:

How can prokaryotic cells be smaller than eukaryotic cells and still carry on all the functions of life

The smallest eukaryotic cell is the motile alga Micromonas. What is the minimum member of organelles this alga must have?

Two types of prokaryotic cells have been distinguished:bacteria and archaea. How do these cells differ from each other ? How are they similar?

In 1985,  a 0.5-mm cell was discovered in surgeonfish and named Epulopiscium fishelsoni(See11.14 page 315) It was presumed to be protozoan, In 1993, researchers determined that Epulopiscium was actually a gram-positive bacterium. Why do you suppose this organism was initially a identified as a protozoan? What evidence would change the classification to the bacterum?

When E. Coli are exposed to hypertonic solition, the bacteria produce a transporter protein that can move K+(Potassium ion) into the cell. Of what value is the active transport of K+, which requires ATP?