1) Which of the following does not represent a gram positive bacteria Primarily
ID: 102518 • Letter: 1
Question
1) Which of the following does not represent a gram positive bacteria
Primarily an endotoxin
Stains purple
No outer membrane
Highly resistant to physical destruction
Thick peptidoglycan layer
2) T/F Diatoms are in the supergroup unikonta
3) T/F Chlorophyta live in diverse habitats, use chlorophyll A and B, store sugars in the form of starch which pretty much describes plants.
4) the group of bacteria that is photosynthetic, unicellular and some of the most self sufficent of all organisms, requiring only light, CO2, N2, water and minerals to survive (I think it is cyanobacteria but not sure)
5) T/F Cyanobacteria are all unicellular
Explanation / Answer
1) Gram positive bacteria do NOT produce endotoxin. The endotoxin is basically the lipid A portion of lipopolysaccharide (LPS) layer, which is present in Gram negative bacteria but not in Gram positive bacteria. The other characteristics like staining purple (on Gram staining), absence of outer membrane, thick peptidoglycan layer and high resistance to physical destruction are present in Gram positive bacteria.
2) False. Diatom does not belong to supergroup unikonta, it belongs to the supergroup chromalveolata.
3) True. Chlorophyta includes green algae, which are primarily found in fresh water environment but can also occur in marine environment. Also, like the green plants, these organisms possess chlorophyll A and B and use starch as the food reserve.
4) Cyanobacteria are photolithoautotrophs. These require CO2 as carbon source and light as source of energy. These use water as the source of electron. Also, many of the cyanobacteria (like cyanobacteria) are diazotrophic (capable of fixing N2). They can grow in the presence of light in medium containing water and few inorganic minerals.
5) True. Cyanobacteria are unicellular, photosynthetic, prokaryotic organisms.
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