If a DNA double helix that is 100 base pairs in length has 32 adenines, how many cytosines, guanines, and thymines must it have?<\/p>\n\n\n\n
The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n To solve this question, we must understand base pairing rules<\/strong> in DNA and apply simple arithmetic.<\/p>\n\n\n\n DNA (deoxyribonucleic acid) is a double-stranded molecule<\/strong> composed of two complementary strands that form a double helix. The building blocks of DNA are nucleotides<\/strong>, each containing a nitrogenous base. There are four types of bases in DNA:<\/p>\n\n\n\n In DNA, the base pairing rules (known as Chargaff’s rules<\/strong>) state:<\/p>\n\n\n\n This means the amount of adenine<\/strong> will always be equal to thymine<\/strong>, and the amount of guanine<\/strong> will always be equal to cytosine<\/strong> in a double-stranded DNA molecule.<\/p>\n\n\n\n Now, let\u2019s analyze the question:<\/p>\n\n\n\n We are told that the DNA has 32 adenines (A)<\/strong>.<\/p>\n\n\n\n Since A pairs with T, there must also be 32 thymines (T)<\/strong>.<\/p>\n\n\n\n So:<\/p>\n\n\n\n This means the remaining base pairs must be G-C pairs<\/strong>: Thus:<\/p>\n\n\n\n Oops! Earlier, we said 36 of each \u2014 let\u2019s fix that!<\/p>\n\n\n\n Correction:<\/p>\n\n\n\n \u2705 Final Answer:<\/strong><\/p>\n\n\n\n The earlier values of 36 were a miscalculation \u2014 thanks for catching that!<\/p>\n","protected":false},"excerpt":{"rendered":" If a DNA double helix that is 100 base pairs in length has 32 adenines, how many cytosines, guanines, and thymines must it have? The correct answer and explanation is : To solve this question, we must understand base pairing rules in DNA and apply simple arithmetic. \ud83e\uddec Correct Answer: \ud83d\udd0d Explanation (300+ words): DNA […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-207838","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/207838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=207838"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/207838\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=207838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=207838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=207838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\n\n\n\ud83e\uddec Correct Answer:<\/strong><\/h3>\n\n\n\n
\n
\n\n\n\n\ud83d\udd0d Explanation (300+ words):<\/strong><\/h3>\n\n\n\n
\n
\n
\n
[
A-T \\text{ pairs} + G-C \\text{ pairs} = 100
]<\/li>\n<\/ul>\n\n\n\n\n
[
100 \\text{ total base pairs} – 32 \\text{ A-T pairs} = 68 \\text{ G-C pairs}
]<\/p>\n\n\n\n\n
\n
\n