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Which of the following is a characteristic of prokaryotic cells?
- a)Presence of multiple chromosomes
- b)Presence of membrane-bound organelles
- c)Presence of a nuclear membrane
- d)Presence of a single chromosome
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is a characteristic of prokaryotic cells?a)Pres...
Prokaryotic cells typically have a single circular chromosome, whereas eukaryotic cells have multiple linear chromosomes.
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Which of the following is a characteristic of prokaryotic cells?a)Pres...
Characteristics of Prokaryotic Cells
Prokaryotic cells are simple, unicellular organisms that lack a true nucleus and membrane-bound organelles. Here’s a closer look at their distinctive features:
Single Chromosome
- Prokaryotic cells typically contain a single, circular chromosome.
- This chromosome is located in the nucleoid region of the cell, which is not surrounded by a nuclear membrane.
- The circular structure allows for efficient replication and expression of genetic material.
Absence of Membrane-bound Organelles
- Unlike eukaryotic cells, prokaryotes do not have membrane-bound organelles.
- Essential processes such as respiration and photosynthesis occur across the cell membrane or within the cytoplasm.
Lack of Nuclear Membrane
- Prokaryotic cells do not possess a nuclear membrane that encloses their genetic material.
- This absence allows for a more straightforward and rapid cellular process, as transcription and translation can occur simultaneously.
Presence of Plasmids
- Many prokaryotic cells also contain plasmids, which are small, circular DNA molecules independent of the chromosomal DNA.
- Plasmids often carry genes that provide advantageous traits, such as antibiotic resistance.
Conclusion
In summary, the defining characteristic of prokaryotic cells is the presence of a single chromosome, which is crucial for their simplicity and efficiency. This differentiates them from eukaryotic cells, which have multiple linear chromosomes and complex internal structures. Understanding these differences is essential for studying cellular biology and the diversity of life forms.
Prokaryotic cells are simple, unicellular organisms that lack a true nucleus and membrane-bound organelles. Here’s a closer look at their distinctive features:
Single Chromosome
- Prokaryotic cells typically contain a single, circular chromosome.
- This chromosome is located in the nucleoid region of the cell, which is not surrounded by a nuclear membrane.
- The circular structure allows for efficient replication and expression of genetic material.
Absence of Membrane-bound Organelles
- Unlike eukaryotic cells, prokaryotes do not have membrane-bound organelles.
- Essential processes such as respiration and photosynthesis occur across the cell membrane or within the cytoplasm.
Lack of Nuclear Membrane
- Prokaryotic cells do not possess a nuclear membrane that encloses their genetic material.
- This absence allows for a more straightforward and rapid cellular process, as transcription and translation can occur simultaneously.
Presence of Plasmids
- Many prokaryotic cells also contain plasmids, which are small, circular DNA molecules independent of the chromosomal DNA.
- Plasmids often carry genes that provide advantageous traits, such as antibiotic resistance.
Conclusion
In summary, the defining characteristic of prokaryotic cells is the presence of a single chromosome, which is crucial for their simplicity and efficiency. This differentiates them from eukaryotic cells, which have multiple linear chromosomes and complex internal structures. Understanding these differences is essential for studying cellular biology and the diversity of life forms.
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Which of the following is a characteristic of prokaryotic cells?a)Presence of multiple chromosomesb)Presence of membrane-bound organellesc)Presence of a nuclear membraned)Presence of a single chromosomeCorrect answer is option 'D'. Can you explain this answer?
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