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Questions tagged [prokaryotic-cells]

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How do I homogenise a small pellet of 10 to 50 cells within less than 50 µL?

I have a problem with declumping/ homogenising bacterial cells in small volumes (10 to 50 µL). I know that I can get all of my cells out of the tube, but they are still stuck together and won't form ...
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1answer
53 views

DNA replication - how many times and when does it occur?

I’m currently learning about DNA replication in both prokaryotic and eukaryotic cells. And my lecturer has mentioned that replication is a once in a lifetime activity. And I’m not sure what this is ...
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1answer
2k 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 ...
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Assignment help: Transcription and translation

I was almost sure I had the right approach to this assignment until I got a variation of answer. Please help to evaluate my approach. An E. coli promoter has the following consensus sequence (Figure ...
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1answer
578 views

Why is translation so much faster in prokaryotes than eukaryotes?

Prokaryotes perform transcription and translation much faster than eukaryotes. If memory serves, a single 70S prokaryotic ribosome can incorporate around 20 amino acids per second, whereas the 80S ...
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1answer
40 views

Are there differences between the activation proteins of Eukaryotes and those of Prokaryotes

I'm in BIO 203 (for reference to my skill level), and I noticed the textbook makes a whole section out of transcriptional activator proteins, their function and applications in eukaryotes, but in ...
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2answers
507 views

How do you differenciate between the eukaryotes and prokaryotes?

I wonder how we differentiate between the eukaryotes and prokaryotes. Eukaryotes: Eukaryotes (also spelled "eucaryotes") comprise animals, plants, and fungi—which are mostly multicellular - as ...
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159 views

Difference in multicellularity between prokaryotic and eukaryotic organisms

As most prokaryotic organisms are single-celled, and in eukaryotic organisms this is the reverse, is there some evolutionary advantage that led to these features evolving? Or is it purely the fact ...
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103 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 ...
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657 views

Advantages and disadvantages of sporulation compared with competence in bacteria?

Why do bacteria have both of these mechanisms to deal with the same environmental stress: nutrient deprivation? In a culture exposed to this condition, often both competent cells and sporulated cells ...
3
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1answer
71 views

Is Sda a protein, or is it a protein domain of DnaA?

I initially thought that a domain was a specific part of a protein, with it given tertiary structure, to which a given molecule is able to bind. (I think I recall phrases such as "the haem binding ...
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1answer
39 views

Do Alicyclobacilli produce carbon dioxide?

Do Alicyclobacilli, especially guaiacol producing ones, still produce carbon dioxide? Alicyclobacillus spp. are well known spoilage organisms in the fruit juice industry. Apparently there is no "...
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22k 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?
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360 views

Why did eukaryotic cells develop? [closed]

If eukaryotic cells can survive in extreme conditions, then why are their still prokaryotic organisms?
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3answers
15k views

Why do bacteria die in a high sugar content environment?

I was reading some questions in the test bank. Then in Chapter 27, I wonder why the answer is A. (undergo death by plasmolysis). Is the high concentration of sugar that kills them or the effects of ...
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1answer
550 views

What is the name of cellular respiration that Prokayotic cells use?

Eukaryotic cells use mitochondria using anaerobic or aerobic respiration. Prokayotic cells lack mitochondria but are bacteria. Mitochondria originated from bacteria and can be used in the same way. ...
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34k views

Linear and Circular DNA

So school has taught us that eukaryotes have DNA that is linear and inside of a membrane - called the nucleus. And that prokaryotes have circular DNA that is free floating inside of the cell. We ...