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Ch. 29 - Fungi

Chapter 28, Problem 7

Lignin and cellulose provide rigidity to the cell walls of plants. But in most fungi, chitin performs this role. Why is it logical that most fungi don't have lignin or cellulose in their cell walls?

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Hi everyone. Let's look at our next question which the following makes up the fungal cell wall. Let's look through our answer choices. Choice A says lignin, lignin is a component of plant cell walls, especially in bark and would where it gives rigidity. So that is not our answer choice B is cellulose cellulose as we might recall. Makes up plant cell walls. So not our answer here. Choice E. Is kitten. And that is our answer. Chitin is a polymer of modified beta glucose sub units and that does make up the fungal cell wall and then finally we have choice D. Pepto glide. Can this makes up the cell walls of most bacteria? So that's why that's not our answer choice. So again, which of the following makes it the fungal cell wall choice. See titan. See you in the next video.
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The Greek root ecto means 'outer.' Why are ectomycorrhizal fungi, or EMF, aptly named? a. Their hyphae form tree-like branching structures inside plant cell walls. b. They are mutualistic. c. Their hyphae form dense mats that envelop roots but do not penetrate the cell walls. d. They transfer nitrogen from outside their plant hosts to the interior.

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Lawns are sometimes fertilized with nitrate that can be washed into neighboring woodlots by rain. If the trees in that woodlot are associated with EMF, what effect might the excess nitrate have on the fungi and/or trees? a. Fungal growth may be stimulated, causing the trees to transport more nitrogen to the fungi. b. The fungi may secrete more peptidases to break down the nitrate. c. The trees may take up the nitrate directly into their roots and rely less on the fungi. d. The excess nitrate may stimulate the fungi to transport more sugar to the trees.

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