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Questions tagged [prokaryotes]

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0
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1answer
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Why don't mitochondria have plasmids?

According to the endosymbiotic theory, mitochondria are descended from specialised bacteria (probably purple nonsulfur bacteria) that somehow survived endocytosis by another species of prokaryote or ...
-2
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1answer
35 views

prokaryotes and Evolution

I have a question that I did not find an answer to online and maybe anyone here could help. Why are there still prokaryotes today? Why didn't they all evolove?
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1answer
1k views

Do all bacterial cells have a double membrane?

I’m reading that gram positive and negative bacteria have an inner plasma membrane surrounding the cytoplasm, then a periplasmic space, then an outer membrane. How does this compare to my general ...
2
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1answer
32 views

The role of GC content in promoting or hindering transcription

This is quite a specific question, and I'm hoping someone might be able to assist in a literature hunt I've been engaged in for ages. I study some long bacterial operons, and have noticed that the GC%...
0
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1answer
173 views

Enhancer elements in prokaryotic DNA?

I know that in terms of post-translational modifications of genes, prokaryotes and eukaryotes differ highly because of the lack of introns in prokaryotic DNA. With this said, do prokaryotic DNA ...
6
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1answer
169 views

Which extinction event killed the highest proportion of organisms?

The P-T extinction (a.k.a. the Great Dying) tends to be considered the worst - for example, Wikipedia states: It is the Earth's most severe known extinction event, with up to 96% of all marine ...
0
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1answer
101 views

How Mitochondria differs from Prokaryotes(probably regarding energy production)? [closed]

In other words, what evolutionary advantage is offered by mitochondria to eukaryotes(probably regarding energy production), which prokaryotes themselves cannot evolve or do?(here I am assuming that ...
3
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0answers
29 views

What happens when you tag a protease with its own degradation tag?

I've been learning about the ClipXP, ClipAP, and Lon proteases. They are proteases from the AAA+ family, which seek out proteins tagged with certain peptide sequences, unfold them, and chop them up. ...
1
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1answer
285 views

Are chromosomal and plasmid DNA in the nucleoid? [closed]

I know plasmid DNA is not part of the chromosome, according to my textbook, but can you still class it as being part of the nucleoid? Also is chromosomal DNA in the nucleoid?
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1answer
6k views

What is the Shine–Dalgarno sequence?

I am trying to understand the Shine–Dalgarno sequence. I currently know it is related to ribosomal binding sites, it is only found in prokaryote cells and it is in front of the initial codon. Also, ...
0
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1answer
344 views

Why are archae and bacteria grouped into separate domains? [closed]

Archae and bacteria are both Prokaryotes. Why are they group into two separate domain?
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4answers
5k views

Why are H+ ions pumped out instead of in during cellular respiration

During cellular respiration in both mitochondria and aerobic prokaryotes, the Electron Transport Chain pumps H+ ions out of the matrix or cytoplasm to create a H+ concentration gradient. This forces ...
8
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2answers
4k views

Do all prokaryotes have ATP synthases and an electron transport chain?

I was looking this up and I'm wondering if so far I'm correct about the following: For the most part eukaryotes do aerobic respiration, which involves glycolysis, the Krebs cycle and oxidative ...
6
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1answer
21k views

Why are plant cells rectangular and animal cells spherical shaped?

Is that because the plant cells have cell walls and animal cells don't, or is there a function performed by the different shapes? Perhaps round shapes assist the movement of cells?
3
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2answers
555 views

Why does the gc content deviate from 50% in prokaryotes

I have read quite some articles but I can't figure out the main reason for gc content deviation in prokaryotes. In eukaryotes I can understand it, because the genome isn't composed at random, like ...
2
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1answer
2k views

Chemoautotrophic eukaryotic cells?

There are heterotrophic prokaryotes, and there are autotrophic prokaryotes. In the autotrophic prokaryotes category, there are photoautotrophic prokaryotes and chemotrophic prokaryotes. Are there ...
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2answers
488 views

The Ancient Kingdom of Monera

Why exactly were bacteria and archaea kingdoms separated from the now unused kingdom of Monera? Aren't they the same? They are both prokaryotes, so what is the difference?
3
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1answer
4k views

Pros/cons: linear vs. circular DNA [duplicate]

Why did Eukaryotes evolve to have linear DNA and not circular like Prokaryotes? What are the pros and/or cons?
3
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2answers
6k views

Does osmosis take place in prokaryotic cells?

As far as I know, osmosis occurs in Eukaryotic cells, and I'm wondering if it could take place in prokaryotic cells too.
0
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1answer
85 views

How is bacterial plasma membrane made?

Eukaryotes have ER which manufactures plasma membrane of cells. How is prokaryotic plasma membrane made ? What is the pathway and which enzymes are involved ?