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Ch. 7 - Inside the Cell
All textbooksFreeman 8th EditionCh. 7 - Inside the CellProblem 5
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Chapter 7, Problem 5

Which of the following cell structures would you expect to be most important in the growth of bacteria on the surface of your teeth? a. cell wall b. fimbriae c. flagella d. cilia

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Hi everyone. Let's look at our next question blank Are the long filament. Is protein structures located at the surface of bacterial cells allowing them to colonize specific surfaces. So let's keep in mind. Our three different things here we've got long filament is protein structures located on bacterial cells allowing them to colonize specific surfaces. With those three things in mind. Um What we are looking for is Choice C. Um They allow the colonization of specific surfaces um by means of binding too specific receptors on those surfaces as part of the formation of biofilms as they adhere to those surfaces. So let's with that in mind let's look at our other answers to understand why they are not what we're looking for here. Choice A says Maya filaments. Well maya filaments are protein filaments but they are found in muscle tissue. So not found out bacterial cells are found in muscle tissue. So that's not a correct answer. Hi Fi. Our filament structures um But they are found in fungi not by bacteria. There are the projections that form the filament is network that fungi form as they grow over a surface. So part of the filament is network. And again found in a fun guy. So we're looking for something from bacterial cells. So hi Fi is not our correct answer again to I. C five is does fill all those three characteristics. And finally flag ela. They are long filament structures located on bacteria but their purpose is movement. So through their movement they allow certain cells like protozoa. Um And spermatozoa and certain other things allow swimming motion as they sort of lash about in this long tail. So flag ela are close but not what we're looking for, which is the filament structures that allow bacterial cells to colonize specific surfaces. So again, too, I see Fimbres is what we're looking for is our answer. See you in the next video.
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Which of the following results provided evidence of a discrete nuclear localization signal somewhere on the nucleoplasmin protein? a. The nucleoplasmin protein was small and easily slipped through the nuclear pore complex. b. After cleavage of the nucleoplasmin protein, only the tail segments appeared in the nucleus. c. Removing the tail from the nucleoplasmin protein allowed the core segment to enter the nucleus. d. The SRP bound only to the tail of the nucleoplasmin protein, not the core segment.

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Cells that line your intestines are known to possess a large number of membrane proteins that transport small molecules and ions across the plasma membrane. Which of the following cell structures would you expect to be required for this characteristic of the cells? a. the endoplasmic reticulum b. peroxisomes c. lysosomes d. the cell wall

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Consider the endosymbiosis theory for the origin of the mitochondrion. How did each endosymbiotic partner benefit from the relationship?

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