UPSC Exam > UPSC Questions > Consider the following statements and choose ...
Start Learning for Free
Consider the following statements and choose the correct code.
Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.
Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.
Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.
Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.
- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true, but R is not the correct explanation of A.
- c)A is false, but R is true.
- d)Both A and R are false.
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Consider the following statements and choose the correct code.Assertio...
In the prokaryotes, all the genetic materials lie inside the cell, no clear or separate nuclear wall is recognized in these cells. In fact no membranebound organelles are found in the prokaryotes. While on the other hand, one of the characteristic features of the eukaryotic cells is the presence of membrane bound organelles. Clear and distinguished nuclear membrane bounds the genetic material inside.
Most Upvoted Answer
Consider the following statements and choose the correct code.Assertio...
Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.
Reason (R): An undifferentiated, unorganised fibrillar chromosome exists inside the prokaryotic cells.
The correct answer is option 'A': Both A and R are true and R is the correct explanation of A.
Explanation:
To understand the given statements, let's first define the terms "true nucleus" and "prokaryotes."
- A true nucleus is a membrane-bound organelle that contains the genetic material (DNA) in eukaryotic cells. It is surrounded by a nuclear envelope and separated from the cytoplasm.
- Prokaryotes are organisms that lack a true nucleus and other membrane-bound organelles. They include bacteria and archaea.
Prokaryotes and the Absence of a True Nucleus:
Prokaryotes, such as E. coli, do not possess a true nucleus. Instead, they have a region called the nucleoid where the genetic material is located. This nucleoid region contains a single, circular DNA molecule that is not enclosed by a nuclear envelope or associated with histone proteins.
Structure of the Nucleoid:
The nucleoid region in prokaryotes consists of an undifferentiated, unorganised fibrillar chromosome. This chromosome is a long, continuous thread-like structure that contains the genetic information necessary for the functioning of the cell. It is not organized into individual chromosomes like in eukaryotes.
Comparison with Eukaryotic Nucleus:
In contrast to prokaryotes, eukaryotes have a true nucleus that is separated from the cytoplasm by a nuclear membrane. The genetic material in eukaryotes is organized into multiple linear chromosomes, which are associated with histone proteins and further packaged into a highly ordered structure.
Explanation of the Assertion and Reason:
The assertion (A) states that a true nucleus is absent in E. coli and other prokaryotes, which is correct.
The reason (R) explains that prokaryotic cells have an undifferentiated, unorganised fibrillar chromosome in their nucleoid region, which also aligns with the characteristics of prokaryotes.
Therefore, both the assertion and the reason are true, and the reason correctly explains the absence of a true nucleus in prokaryotes like E. coli. Hence, option 'A' is the correct answer.
Reason (R): An undifferentiated, unorganised fibrillar chromosome exists inside the prokaryotic cells.
The correct answer is option 'A': Both A and R are true and R is the correct explanation of A.
Explanation:
To understand the given statements, let's first define the terms "true nucleus" and "prokaryotes."
- A true nucleus is a membrane-bound organelle that contains the genetic material (DNA) in eukaryotic cells. It is surrounded by a nuclear envelope and separated from the cytoplasm.
- Prokaryotes are organisms that lack a true nucleus and other membrane-bound organelles. They include bacteria and archaea.
Prokaryotes and the Absence of a True Nucleus:
Prokaryotes, such as E. coli, do not possess a true nucleus. Instead, they have a region called the nucleoid where the genetic material is located. This nucleoid region contains a single, circular DNA molecule that is not enclosed by a nuclear envelope or associated with histone proteins.
Structure of the Nucleoid:
The nucleoid region in prokaryotes consists of an undifferentiated, unorganised fibrillar chromosome. This chromosome is a long, continuous thread-like structure that contains the genetic information necessary for the functioning of the cell. It is not organized into individual chromosomes like in eukaryotes.
Comparison with Eukaryotic Nucleus:
In contrast to prokaryotes, eukaryotes have a true nucleus that is separated from the cytoplasm by a nuclear membrane. The genetic material in eukaryotes is organized into multiple linear chromosomes, which are associated with histone proteins and further packaged into a highly ordered structure.
Explanation of the Assertion and Reason:
The assertion (A) states that a true nucleus is absent in E. coli and other prokaryotes, which is correct.
The reason (R) explains that prokaryotic cells have an undifferentiated, unorganised fibrillar chromosome in their nucleoid region, which also aligns with the characteristics of prokaryotes.
Therefore, both the assertion and the reason are true, and the reason correctly explains the absence of a true nucleus in prokaryotes like E. coli. Hence, option 'A' is the correct answer.
Attention UPSC Students!
To make sure you are not studying endlessly, EduRev has designed UPSC study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in UPSC.
|
Explore Courses for UPSC exam
|
|
Similar UPSC Doubts
Top Courses for UPSCView all
Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer?
Question Description
Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer?.
Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for UPSC.
Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free.
Here you can find the meaning of Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider the following statements and choose the correct code.Assertion (A): A true nucleus is absent in E. coli and other prokaryotes.Reason (R): An undifferentiated, unorganised fibrillar chromosome existsinside the prokaryotic cells.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true, but R is not the correct explanation of A.c)A is false, but R is true.d)Both A and R are false.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice UPSC tests.
|
|
Explore Courses for UPSC exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup