The Question is from neet-botany , and it was created by the author Mr. NARESH KUMAR K

Question

Given below are two statements:
Statement I: In prokaryotes, the genetic material is organized in a region called the nucleoid, which lacks a membrane.
Statement II: In eukaryotes, the negatively charged DNA is wrapped around positively charged histone proteins to form nucleosomes.
In light of the above statements, choose the correct answer from the options given below:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Cell structure and organization of genetic material in prokaryotes and eukaryotes.
 **Related Topics**: Prokaryotic vs. eukaryotic cells, DNA packaging, nucleoid, nucleosomes, histones.
 **Prerequisites**: Basic understanding of cell biology.
## SOLUTION PATHWAY
**Given Information**:
  Statement I: Prokaryotes have a nucleoid region lacking a membrane.
  Statement II: Eukaryotes use histones to package DNA into nucleosomes.
**Method & Steps**:
 1. Evaluate Statement I:
  Reasoning: Prokaryotic cells (like bacteria) lack a nucleus. Their genetic material is located in a region called the nucleoid, which is not enclosed by a membrane.
  Formula/Rule: N/A
 2. Evaluate Statement II:
  Working: Eukaryotic cells have a nucleus containing linear chromosomes.  DNA in eukaryotes is tightly packaged around histone proteins, forming nucleosomes, which further condense into chromatin fibers.
  Key Point: The positive charge of histones helps neutralize the negative charge of DNA, facilitating compaction.
 3. Determine the overall correctness of both statements:
  Result: Both statements are accurate descriptions of prokaryotic and eukaryotic cell structures.
  Verification:  The descriptions align with established knowledge in cell biology.
 ## OPTION ANALYSIS
A ✓: Both Statement I and Statement II are correct. This is the correct option since both statements accurately reflect the organization of genetic material in prokaryotes and eukaryotes.
B :x: Both Statement I and Statement II are incorrect. This is incorrect as both statements are true.
C :x: Statement I is correct but Statement II is incorrect. This is incorrect as both statements are true.
D :x: Statement I is incorrect but Statement II is correct. This is incorrect as both statements are true.
 ## LEARNING AIDS
 **Common Mistakes**: Incorrectly associating histones with prokaryotes or a membrane with the nucleoid.
  1.Error 1: Assuming prokaryotes have a membrane-bound nucleus. 
           How to avoid: Remember that the defining characteristic of prokaryotes is the lack of membrane-bound organelles, including the nucleus.
  2.Error 2: Confusing nucleosomes and nucleoids.
           How to avoid: Nucleosomes are the basic structural units of chromatin in eukaryotes, while the nucleoid is the region in prokaryotes where DNA is located.
 **Quick Tips**:  Think of prokaryotes as simpler cells lacking membrane-bound organelles, while eukaryotes are more complex and have a nucleus and other organelles.

Mr. NARESH KUMAR K · Answer

The correct Option is "Both Statement I and Statement II are correct"

Mr. NARESH KUMAR K · Answer

Both Statement I and Statement II are incorrect

Mr. NARESH KUMAR K · Answer

Statement I is correct but Statement II is incorrect

Mr. NARESH KUMAR K · Answer

Statement I is incorrect but Statement II is correct

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