The Question is from neet-botany cell-biology , and it was created by the author D VINOD

Question

Which unique feature of prokaryotic DNA replication allows for rapid cell division?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Prokaryotic DNA Replication
	**Related Topics**: Binary Fission, Cell Cycle, DNA Structure
	**Prerequisites**: Basic understanding of DNA replication and prokaryotic cell structure.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about a feature that contributes to *rapid* cell division in prokaryotes.
**Method & Steps**:
	1. **Consider the characteristics of prokaryotic DNA**: Prokaryotic DNA is typically circular and located in the cytoplasm, unlike eukaryotic DNA which is linear and within a nucleus.
		Reasoning: This structural difference influences the replication process.
	2. **Focus on the origin of replication**: Prokaryotic DNA replication begins at a *single* origin of replication.
		Working: From this single origin, replication proceeds bidirectionally, creating two replication forks that move around the circular chromosome.
		Key Point:  A single origin simplifies and speeds up the replication process.
	3. **Relate replication speed to cell division**:  Faster DNA replication allows for a shorter cell cycle and thus more rapid cell division.
		Result: The single origin of replication is the key feature enabling rapid prokaryotic cell division.
		Verification:  This aligns with the fact that prokaryotes, like bacteria, can reproduce very quickly.
 ## OPTION ANALYSIS
[A] :x: Presence of introns: Introns are primarily found in eukaryotic genes, not prokaryotic. While they play a role in gene regulation in eukaryotes, they don't contribute to rapid cell division in prokaryotes.
[B] ✓: Single origin of replication: Having a single origin allows for rapid and efficient replication of the entire circular chromosome, enabling faster cell division.
[C] :x: Linear chromosomes: Prokaryotes have circular chromosomes, not linear ones. Linear chromosomes, typical of eukaryotes, have multiple origins of replication.
[D] :x: Multiple replication forks: While prokaryotic replication *does* involve two replication forks, these forks originate from the *single* origin.  The presence of two forks aids in rapid replication but isn't the primary factor; the single origin is the key.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing prokaryotic and eukaryotic DNA characteristics: Remember the key differences – circular vs. linear chromosomes, single vs. multiple origins of replication.
		2. Focusing on replication forks without considering the origin:  While multiple forks speed up replication, they are a consequence of the single origin, which is the defining feature.
	**Quick Tips**:
		1. Associate 'single' and 'simple' with prokaryotes: Single, circular chromosome; single origin of replication; simpler cell structure overall.
		2. Visualize the replication process: Imagine the circular chromosome and the two forks moving outwards from the single origin, quickly replicating the entire DNA molecule.

D VINOD · Answer

Presence of introns

D VINOD · Answer

The correct Option is "Single origin of replication"

D VINOD · Answer

Linear chromosomes

D VINOD · Answer

Multiple replication forks

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