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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.
Assertion : Chloroplasts and mitochondria are
treated as self-autonomous organelles.
Reason : In bacteria, small circular DNA molecules are present in cytoplasm.
- 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 true but R is false.
- d)A is false but R is true.
Correct answer is option 'D'. Can you explain this answer?
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Directions : In the following question, the Assertions (A) and Reason...
Chloroplasts and mitochondria are treated as self-autonomous organelles because of the presence of this DNA molecule.
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In bacteria, additional to the genomic DNA, small circular DNA molecules are present in cytoplasm. These small molecules are called plasmids.
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Directions : In the following question, the Assertions (A) and Reason...
Assertion: Mitochondria and chloroplast are semiautonomous organelles.
Reason: They are formed by division of preexisting organelles as well as contain DNA but lack protein-synthesizing machinery.
The assertion states that mitochondria and chloroplast are semiautonomous organelles, while the reason given is that they are formed by division of preexisting organelles and contain DNA but lack protein-synthesizing machinery.
Explanation:
Definition of Semiautonomous Organelles:
Semiautonomous organelles are organelles that have their own DNA and are capable of self-replication and division. They are not completely autonomous as they still rely on the cell for some essential functions.
Mitochondria:
- Mitochondria are semiautonomous organelles found in eukaryotic cells.
- They are responsible for producing energy in the form of ATP through cellular respiration.
- Mitochondria have their own DNA, known as mitochondrial DNA (mtDNA), which is circular and similar to bacterial DNA.
- They also have their own ribosomes, which are responsible for protein synthesis. However, these ribosomes are different from the ones found in the cytoplasm of the cell.
- Mitochondria can divide and replicate themselves through a process called fission, which is similar to bacterial division.
- Mitochondria are believed to have originated from a symbiotic relationship between an ancestral eukaryotic cell and an aerobic prokaryote.
Chloroplasts:
- Chloroplasts are semiautonomous organelles found in plant cells and some protists.
- They are responsible for photosynthesis, which is the process of converting light energy into chemical energy in the form of glucose.
- Like mitochondria, chloroplasts have their own DNA, known as chloroplast DNA (cpDNA), which is circular and similar to bacterial DNA.
- Chloroplasts also have their own ribosomes, which are responsible for protein synthesis. However, these ribosomes are different from the ones found in the cytoplasm of the cell.
- Chloroplasts can divide and replicate themselves through a process similar to bacterial division.
- Chloroplasts are believed to have originated from a symbiotic relationship between an ancestral eukaryotic cell and a photosynthetic prokaryote.
Explanation of the Assertion and Reason:
The assertion that mitochondria and chloroplast are semiautonomous organelles is correct. Both mitochondria and chloroplast have their own DNA and can divide and replicate themselves through a process similar to bacterial division. This makes them semiautonomous as they can carry out some essential functions independently.
However, the reason given for this assertion is incorrect. Both mitochondria and chloroplast do have protein-synthesizing machinery in the form of their own ribosomes. These ribosomes are responsible for protein synthesis within these organelles. Therefore, the reason provided does not correctly explain the assertion.
Conclusion:
In conclusion, the correct answer is option D. The assertion is correct, but the reason is incorrect. Mitochondria and chloroplast are semiautonomous organelles that have their own DNA and can replicate themselves, but they do possess protein-synthesizing machinery in the form of their own ribosomes.
Reason: They are formed by division of preexisting organelles as well as contain DNA but lack protein-synthesizing machinery.
The assertion states that mitochondria and chloroplast are semiautonomous organelles, while the reason given is that they are formed by division of preexisting organelles and contain DNA but lack protein-synthesizing machinery.
Explanation:
Definition of Semiautonomous Organelles:
Semiautonomous organelles are organelles that have their own DNA and are capable of self-replication and division. They are not completely autonomous as they still rely on the cell for some essential functions.
Mitochondria:
- Mitochondria are semiautonomous organelles found in eukaryotic cells.
- They are responsible for producing energy in the form of ATP through cellular respiration.
- Mitochondria have their own DNA, known as mitochondrial DNA (mtDNA), which is circular and similar to bacterial DNA.
- They also have their own ribosomes, which are responsible for protein synthesis. However, these ribosomes are different from the ones found in the cytoplasm of the cell.
- Mitochondria can divide and replicate themselves through a process called fission, which is similar to bacterial division.
- Mitochondria are believed to have originated from a symbiotic relationship between an ancestral eukaryotic cell and an aerobic prokaryote.
Chloroplasts:
- Chloroplasts are semiautonomous organelles found in plant cells and some protists.
- They are responsible for photosynthesis, which is the process of converting light energy into chemical energy in the form of glucose.
- Like mitochondria, chloroplasts have their own DNA, known as chloroplast DNA (cpDNA), which is circular and similar to bacterial DNA.
- Chloroplasts also have their own ribosomes, which are responsible for protein synthesis. However, these ribosomes are different from the ones found in the cytoplasm of the cell.
- Chloroplasts can divide and replicate themselves through a process similar to bacterial division.
- Chloroplasts are believed to have originated from a symbiotic relationship between an ancestral eukaryotic cell and a photosynthetic prokaryote.
Explanation of the Assertion and Reason:
The assertion that mitochondria and chloroplast are semiautonomous organelles is correct. Both mitochondria and chloroplast have their own DNA and can divide and replicate themselves through a process similar to bacterial division. This makes them semiautonomous as they can carry out some essential functions independently.
However, the reason given for this assertion is incorrect. Both mitochondria and chloroplast do have protein-synthesizing machinery in the form of their own ribosomes. These ribosomes are responsible for protein synthesis within these organelles. Therefore, the reason provided does not correctly explain the assertion.
Conclusion:
In conclusion, the correct answer is option D. The assertion is correct, but the reason is incorrect. Mitochondria and chloroplast are semiautonomous organelles that have their own DNA and can replicate themselves, but they do possess protein-synthesizing machinery in the form of their own ribosomes.
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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer?
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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer?.
Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer?.
Solutions for Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
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ample number of questions to practice Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.Assertion : Chloroplasts and mitochondria aretreated as self-autonomous organelles.Reason : In bacteria, small circular DNA molecules are present in cytoplasm.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 true but R is false.d)A is false but R is true.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice NEET tests.
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