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Title: What has flagella, a peptidoglycan cell wall, and ribosomes but lacks chloroplasts? Post by: iloveanatomy on Dec 17, 2012 This is a question off of my AP-Bio homework that I cant get! "A biologist isolates green-colored organisms from a sample of water from a pond. They contain flagella, a peptidoglycan cell wall, and ribosomes but lacks chloroplasts?
They are classafied as: a- plant cells b- photosynthetic animal cells c- photosynthetic viruses d- moss e- photosynthetic cyanobacteria Im stumped. What do you think? Title: What has flagella, a peptidoglycan cell wall, and ribosomes but lacks chloroplasts? Post by: ilocanababy on Dec 17, 2012 Content hidden
Title: What has flagella, a peptidoglycan cell wall, and ribosomes but lacks chloroplasts? Post by: toney32 on Dec 17, 2012 e- photosynthetic cyanobacteria.
Bacteria has all the three that you mentioned. Title: What has flagella, a peptidoglycan cell wall, and ribosomes but lacks chloroplasts? Post by: too_gq_4u on Dec 17, 2012 Photosynthetic cyanobacteria
Title: What has flagella, a peptidoglycan cell wall, and ribosomes but lacks chloroplasts? Post by: Leon95 on Dec 17, 2012 Funny question. I guess you could eliminate all the photosynthetic choices and since plants do not have flagella, I would go with moss. Just a guess.
Title: Re: What has flagella, a peptidoglycan cell wall, and ribosomes but lacks chloroplasts? Post by: MarkHolland on Dec 21, 2012 Peptidoglycan, also known as murein, is a polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of bacteria (but not Archaea), forming the cell wall. The sugar component consists of alternating residues of β-(1,4) linked N-acetylglucosamine and N-acetylmuramic acid. Attached to the N-acetylmuramic acid is a peptide chain of three to five amino acids. The peptide chain can be cross-linked to the peptide chain of another strand forming the 3D mesh-like layer. Some Archaea have a similar layer of pseudopeptidoglycan or pseudomurein, where the sugar residues are β-(1,3) linked N-acetylglucosamine and N-acetyltalosaminuronic acid. That is why the cell wall of Archaea is insensitive to lysozyme.Peptidoglycan serves a structural role in the bacterial cell wall, giving structural strength, as well as counteracting the osmotic pressure of the cytoplasm. A common misconception is that peptidoglycan gives the cell its shape; however, whereas peptidoglycan helps maintain the structural strength of the cell, it is actually the MreB protein that facilitates cell shape[citation needed].Peptidoglycan is also involved in binary fission during bacterial cell reproduction.
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