Which of the following represents the complementary strand of a DNA sequence 3′ TCGATCGCA 5′?<\/p>\n\n\n\n
A.
3′ AGCTAGCGT 5′<\/p>\n\n\n\n
B.
5\u2019 AGCTAGCGT 3\u2019<\/p>\n\n\n\n
C.
5′ UCGAUCGCA 3′<\/p>\n\n\n\n
D.
3′ TCGUTCGCU 3′<\/p>\n\n\n\n
The correct answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n The correct answer is B. 5′ AGCTAGCGT 3′<\/strong>.<\/p>\n\n\n\n DNA (Deoxyribonucleic acid) consists of two complementary strands that are arranged in an antiparallel fashion. Each strand is made up of nucleotides, which include a sugar, phosphate group, and a nitrogenous base. The bases pair according to specific rules:<\/p>\n\n\n\n These base pairings occur due to hydrogen bonding: A forms two hydrogen bonds with T, while G forms three hydrogen bonds with C. The complementary strands of DNA are always in opposite directions, meaning the 5′ end of one strand pairs with the 3′ end of the other.<\/p>\n\n\n\n In the given question, the original DNA strand is: To determine the complementary strand, follow these steps:<\/p>\n\n\n\n Thus, the complementary strand is: Thus, the final complementary strand is: Other options are incorrect because:<\/p>\n\n\n\n Which of the following represents the complementary strand of a DNA sequence 3′ TCGATCGCA 5′? A.3′ AGCTAGCGT 5′ B.5\u2019 AGCTAGCGT 3\u2019 C.5′ UCGAUCGCA 3′ D.3′ TCGUTCGCU 3′ The correct answer and Explanation is : The correct answer is B. 5′ AGCTAGCGT 3′. Explanation: DNA (Deoxyribonucleic acid) consists of two complementary strands that are arranged in […]<\/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-138886","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/138886","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=138886"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/138886\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=138886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=138886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=138886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Explanation:<\/h3>\n\n\n\n
\n
3′ TCGATCGCA 5′<\/strong><\/p>\n\n\n\n\n
\n
AGCTAGCGT<\/strong><\/p>\n\n\n\n\n
The direction of the complementary strand must be antiparallel to the original strand. Since the original strand is in the 3′ to 5′ direction, the complementary strand must run in the 5′ to 3′ direction.<\/li>\n<\/ol>\n\n\n\n
5′ AGCTAGCGT 3′<\/strong>, which corresponds to option B<\/strong>.<\/p>\n\n\n\n\n