IIT JAM Exam > IIT JAM Questions > Consider the following statementsP)The length...
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Consider the following statements
P) The length of the DNA is directly proportional to the gene density
Q) DNA proofreading by RNA polymerase is done by backtracking
R) Splicing of nuclear mRNA occurs in the nucleus
P) The length of the DNA is directly proportional to the gene density
Q) DNA proofreading by RNA polymerase is done by backtracking
R) Splicing of nuclear mRNA occurs in the nucleus
- a)All P, Q and R are true
- b)Only P is true
- c)Q and R are true
- d)Only P is false
Correct answer is option 'C,D'. Can you explain this answer?
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Verified Answer
Consider the following statementsP)The length of the DNA is directly p...
Out of the given statements, statement Q and R are true and statement P is false. The length of DNA does not directly relate with gene density. Rather, the longer is DNA, greater are the chances of it containing non-coding regions or introns. DNA proofreading by RNA polymerase involves backtracking, whereby RNA polymerase removes abnormal or mismatched nucleotides. Splicing is a process, whereby introns are removed from the primary transcript and it occurs in nucleus of the cell either co-transcriptionally or post-transcriptionally.
Most Upvoted Answer
Consider the following statementsP)The length of the DNA is directly p...
Statement P: The length of the DNA is directly proportional to the gene density.
This statement is false. The length of DNA is not directly proportional to gene density. Gene density refers to the number of genes present in a given length of DNA. The gene density can vary widely depending on the organism and the specific region of DNA being considered. In some regions, there may be a high density of genes, while in others, there may be a low density or no genes at all. Therefore, the length of DNA cannot be used as a reliable indicator of gene density.
Statement Q: DNA proofreading by RNA polymerase is done by backtracking.
This statement is true. During transcription, RNA polymerase synthesizes RNA using one of the DNA strands as a template. In order to ensure accurate transcription, RNA polymerase has a proofreading mechanism. If an incorrect nucleotide is added to the growing RNA chain, RNA polymerase can backtrack and remove the incorrect nucleotide before continuing with transcription. This proofreading mechanism helps to maintain the fidelity of the transcription process.
Statement R: Splicing of nuclear mRNA occurs in the nucleus.
This statement is true. Splicing is a process that removes introns (non-coding regions) from pre-mRNA and joins together the exons (coding regions) to produce mature mRNA. This process occurs in the nucleus of eukaryotic cells. After splicing, the mature mRNA is transported out of the nucleus and into the cytoplasm, where it can be translated into protein by ribosomes.
Summary:
- Statement P is false because the length of DNA is not directly proportional to gene density.
- Statement Q is true because RNA polymerase can backtrack and remove incorrect nucleotides during transcription.
- Statement R is true because splicing of nuclear mRNA occurs in the nucleus.
This statement is false. The length of DNA is not directly proportional to gene density. Gene density refers to the number of genes present in a given length of DNA. The gene density can vary widely depending on the organism and the specific region of DNA being considered. In some regions, there may be a high density of genes, while in others, there may be a low density or no genes at all. Therefore, the length of DNA cannot be used as a reliable indicator of gene density.
Statement Q: DNA proofreading by RNA polymerase is done by backtracking.
This statement is true. During transcription, RNA polymerase synthesizes RNA using one of the DNA strands as a template. In order to ensure accurate transcription, RNA polymerase has a proofreading mechanism. If an incorrect nucleotide is added to the growing RNA chain, RNA polymerase can backtrack and remove the incorrect nucleotide before continuing with transcription. This proofreading mechanism helps to maintain the fidelity of the transcription process.
Statement R: Splicing of nuclear mRNA occurs in the nucleus.
This statement is true. Splicing is a process that removes introns (non-coding regions) from pre-mRNA and joins together the exons (coding regions) to produce mature mRNA. This process occurs in the nucleus of eukaryotic cells. After splicing, the mature mRNA is transported out of the nucleus and into the cytoplasm, where it can be translated into protein by ribosomes.
Summary:
- Statement P is false because the length of DNA is not directly proportional to gene density.
- Statement Q is true because RNA polymerase can backtrack and remove incorrect nucleotides during transcription.
- Statement R is true because splicing of nuclear mRNA occurs in the nucleus.
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Consider the following statementsP)The length of the DNA is directly proportional to the gene densityQ)DNA proofreading by RNA polymerase is done by backtrackingR)Splicing of nuclear mRNA occurs in the nucleusa)All P, Q and R are trueb)Only P is truec)Q and R are trued)Only P is falseCorrect answer is option 'C,D'. Can you explain this answer?
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