{"id":87369,"date":"2025-06-01T06:41:49","date_gmt":"2025-06-01T06:41:49","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87369"},"modified":"2025-06-01T06:41:49","modified_gmt":"2025-06-01T06:41:49","slug":"which-of-the-following-statements-about-dna-is-are-correct-1-dna","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/","title":{"rendered":"Which of the following statements about DNA is\/are correct ?\n  1. DNA"},"content":{"rendered":"<p>Which of the following statements about DNA is\/are correct ?<\/p>\n<ul>\n<li>1. DNA is the hereditary material of all living organisms.<\/li>\n<li>2. All segments of DNA code for synthesis of proteins.<\/li>\n<li>3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.<\/li>\n<li>4. DNA is also found in mitochondria.<\/li>\n<\/ul>\n<p>Select the correct answer using the code given below :<\/p>\n<p>[amp_mcq option1=&#8221;1, 2 and 3 only&#8221; option2=&#8221;3 and 4 only&#8221; option3=&#8221;1, 3 and 4 only&#8221; option4=&#8221;4 only&#8221; correct=&#8221;option2&#8243;]<\/p>\n<div class=\"psc-box-pyq-exam-year-detail\">\n<div class=\"pyq-exam\">\n<div class=\"psc-heading\">This question was previously asked in<\/div>\n<div class=\"psc-title line-ellipsis\">UPSC NDA-1 &#8211; 2016<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-nda-1-2016.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-nda-1-2016\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nLet&#8217;s evaluate each statement:<br \/>\n1. DNA is the hereditary material of all living organisms. This is incorrect. While DNA is the hereditary material for most organisms (bacteria, archaea, eukaryotes), some viruses use RNA as their genetic material.<br \/>\n2. All segments of DNA code for synthesis of proteins. This is incorrect. Large portions of DNA in eukaryotic genomes are non-coding. This includes regulatory sequences, introns (non-coding regions within genes), repetitive DNA, telomeres, etc.<br \/>\n3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. This is correct. The Watson-Crick model describes DNA as a double helix where the two polynucleotide strands are complementary and run in opposite directions (5&#8242; to 3&#8242; and 3&#8242; to 5&#8242;).<br \/>\n4. DNA is also found in mitochondria. This is correct. Mitochondria (and chloroplasts in plants) contain their own circular DNA (mtDNA), which is distinct from the nuclear DNA.<br \/>\nBased on the analysis, statements 3 and 4 are correct.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\n&#8211; DNA is the primary genetic material, but not universal (some viruses use RNA).<br \/>\n&#8211; Not all DNA sequences are protein-coding.<br \/>\n&#8211; Nuclear DNA is a double helix with anti-parallel strands.<br \/>\n&#8211; Extranuclear DNA exists in organelles like mitochondria and chloroplasts.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nMitochondrial DNA (mtDNA) is typically circular and much smaller than nuclear DNA. It encodes some proteins involved in cellular respiration, as well as ribosomal RNAs and transfer RNAs used within the mitochondrion. Due to its maternal inheritance pattern in many species, mtDNA is useful in tracing evolutionary lineages.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following statements about DNA is\/are correct ? 1. DNA is the hereditary material of all living organisms. 2. All segments of DNA code for synthesis of proteins. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. 4. DNA is also found in mitochondria. Select the correct answer using &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Which of the following statements about DNA is\/are correct ?\n  1. DNA\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/#more-87369\">Detailed Solution<span class=\"screen-reader-text\">Which of the following statements about DNA is\/are correct ?<br \/>\n  1. DNA<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1093],"tags":[1098,1117,1152],"class_list":["post-87369","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1098","tag-biology","tag-cell","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Which of the following statements about DNA is\/are correct ?  1. DNA<\/title>\n<meta name=\"description\" content=\"Let&#039;s evaluate each statement: 1. DNA is the hereditary material of all living organisms. This is incorrect. While DNA is the hereditary material for most organisms (bacteria, archaea, eukaryotes), some viruses use RNA as their genetic material. 2. All segments of DNA code for synthesis of proteins. This is incorrect. Large portions of DNA in eukaryotic genomes are non-coding. This includes regulatory sequences, introns (non-coding regions within genes), repetitive DNA, telomeres, etc. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. This is correct. The Watson-Crick model describes DNA as a double helix where the two polynucleotide strands are complementary and run in opposite directions (5&#039; to 3&#039; and 3&#039; to 5&#039;). 4. DNA is also found in mitochondria. This is correct. Mitochondria (and chloroplasts in plants) contain their own circular DNA (mtDNA), which is distinct from the nuclear DNA. Based on the analysis, statements 3 and 4 are correct. - DNA is the primary genetic material, but not universal (some viruses use RNA). - Not all DNA sequences are protein-coding. - Nuclear DNA is a double helix with anti-parallel strands. - Extranuclear DNA exists in organelles like mitochondria and chloroplasts.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which of the following statements about DNA is\/are correct ?  1. DNA\" \/>\n<meta property=\"og:description\" content=\"Let&#039;s evaluate each statement: 1. DNA is the hereditary material of all living organisms. This is incorrect. While DNA is the hereditary material for most organisms (bacteria, archaea, eukaryotes), some viruses use RNA as their genetic material. 2. All segments of DNA code for synthesis of proteins. This is incorrect. Large portions of DNA in eukaryotic genomes are non-coding. This includes regulatory sequences, introns (non-coding regions within genes), repetitive DNA, telomeres, etc. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. This is correct. The Watson-Crick model describes DNA as a double helix where the two polynucleotide strands are complementary and run in opposite directions (5&#039; to 3&#039; and 3&#039; to 5&#039;). 4. DNA is also found in mitochondria. This is correct. Mitochondria (and chloroplasts in plants) contain their own circular DNA (mtDNA), which is distinct from the nuclear DNA. Based on the analysis, statements 3 and 4 are correct. - DNA is the primary genetic material, but not universal (some viruses use RNA). - Not all DNA sequences are protein-coding. - Nuclear DNA is a double helix with anti-parallel strands. - Extranuclear DNA exists in organelles like mitochondria and chloroplasts.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:41:49+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which of the following statements about DNA is\/are correct ?  1. DNA","description":"Let's evaluate each statement: 1. DNA is the hereditary material of all living organisms. This is incorrect. While DNA is the hereditary material for most organisms (bacteria, archaea, eukaryotes), some viruses use RNA as their genetic material. 2. All segments of DNA code for synthesis of proteins. This is incorrect. Large portions of DNA in eukaryotic genomes are non-coding. This includes regulatory sequences, introns (non-coding regions within genes), repetitive DNA, telomeres, etc. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. This is correct. The Watson-Crick model describes DNA as a double helix where the two polynucleotide strands are complementary and run in opposite directions (5' to 3' and 3' to 5'). 4. DNA is also found in mitochondria. This is correct. Mitochondria (and chloroplasts in plants) contain their own circular DNA (mtDNA), which is distinct from the nuclear DNA. Based on the analysis, statements 3 and 4 are correct. - DNA is the primary genetic material, but not universal (some viruses use RNA). - Not all DNA sequences are protein-coding. - Nuclear DNA is a double helix with anti-parallel strands. - Extranuclear DNA exists in organelles like mitochondria and chloroplasts.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/","og_locale":"en_US","og_type":"article","og_title":"Which of the following statements about DNA is\/are correct ?  1. DNA","og_description":"Let's evaluate each statement: 1. DNA is the hereditary material of all living organisms. This is incorrect. While DNA is the hereditary material for most organisms (bacteria, archaea, eukaryotes), some viruses use RNA as their genetic material. 2. All segments of DNA code for synthesis of proteins. This is incorrect. Large portions of DNA in eukaryotic genomes are non-coding. This includes regulatory sequences, introns (non-coding regions within genes), repetitive DNA, telomeres, etc. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. This is correct. The Watson-Crick model describes DNA as a double helix where the two polynucleotide strands are complementary and run in opposite directions (5' to 3' and 3' to 5'). 4. DNA is also found in mitochondria. This is correct. Mitochondria (and chloroplasts in plants) contain their own circular DNA (mtDNA), which is distinct from the nuclear DNA. Based on the analysis, statements 3 and 4 are correct. - DNA is the primary genetic material, but not universal (some viruses use RNA). - Not all DNA sequences are protein-coding. - Nuclear DNA is a double helix with anti-parallel strands. - Extranuclear DNA exists in organelles like mitochondria and chloroplasts.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T06:41:49+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/","name":"Which of the following statements about DNA is\/are correct ? 1. DNA","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T06:41:49+00:00","dateModified":"2025-06-01T06:41:49+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Let's evaluate each statement: 1. DNA is the hereditary material of all living organisms. This is incorrect. While DNA is the hereditary material for most organisms (bacteria, archaea, eukaryotes), some viruses use RNA as their genetic material. 2. All segments of DNA code for synthesis of proteins. This is incorrect. Large portions of DNA in eukaryotic genomes are non-coding. This includes regulatory sequences, introns (non-coding regions within genes), repetitive DNA, telomeres, etc. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel. This is correct. The Watson-Crick model describes DNA as a double helix where the two polynucleotide strands are complementary and run in opposite directions (5' to 3' and 3' to 5'). 4. DNA is also found in mitochondria. This is correct. Mitochondria (and chloroplasts in plants) contain their own circular DNA (mtDNA), which is distinct from the nuclear DNA. Based on the analysis, statements 3 and 4 are correct. - DNA is the primary genetic material, but not universal (some viruses use RNA). - Not all DNA sequences are protein-coding. - Nuclear DNA is a double helix with anti-parallel strands. - Extranuclear DNA exists in organelles like mitochondria and chloroplasts.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-about-dna-is-are-correct-1-dna\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-1\/"},{"@type":"ListItem","position":3,"name":"Which of the following statements about DNA is\/are correct ? 1. 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