{"id":567,"date":"2023-11-29T22:53:45","date_gmt":"2023-11-29T22:53:45","guid":{"rendered":"https:\/\/cellandcelldivision.com\/?p=567"},"modified":"2023-11-29T22:53:45","modified_gmt":"2023-11-29T22:53:45","slug":"page-109","status":"publish","type":"post","link":"https:\/\/cellandcelldivision.com\/?p=567","title":{"rendered":"Page 109"},"content":{"rendered":"\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"602\" height=\"440\" src=\"https:\/\/cellandcelldivision.com\/wp-content\/uploads\/2023\/11\/image-35.png\" alt=\"\" class=\"wp-image-609\" srcset=\"https:\/\/cellandcelldivision.com\/wp-content\/uploads\/2023\/11\/image-35.png 602w, https:\/\/cellandcelldivision.com\/wp-content\/uploads\/2023\/11\/image-35-300x219.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-verse has-text-align-center\">Figure 2\u201338. Portions of the polynucleotide chains of DNA (A) and RNA (B). <\/pre>\n\n\n\n<p class=\"has-text-align-center\"><strong>The Watson and Crick Model<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center\">The authors of the model \u2014 James Watson and Francis Crick (1953 a)<br>have established that the DNA molecule is a double helix consisting of<br>two complementary chains built from four bases \u2014 adenine (A), guanine<br>(G), thymine (T) and cytosine (C). The bases are situated inside the helix<br>linked by hydrogen bonds, and the sugar-phosphate skeletons are<br>outside forming the frame. At that, adenine is always bound to thymine<br>(A\u2014T) and guanine to cytosine (G\u2014C). The bound bases lie on planes<br>perpendicular to a helix axis and are located one under the other at a<br>distance of 0.34 nm. A full turn is accomplished by 10 pairs of bases<br>forming a step of 3.4 nm (Fig. 2\u201339).<br>This model has fully satisfied the requirements posed by the then<br>existing data from the X-ray diffraction studies. Besides it revealed the<br>possibility of self-replication, since the DNA molecule comprises two<br>complementary chains which can be uncoiled and each of the initial chains<br>may serve as a template for the synthesis of a new complementary chain<br>(Watson, Crick, 1953 b).<br>The biological essence born by this discovery was so great that it<br>has brought its authors immediate recognition and gave a strong impetus<br>to the development of biology, molecular biology and genetics in<br>particular. Proteins regarded as eventual bearers of heredity until then<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Figure 2\u201338. Portions of the polynucleotide chains of DNA (A) and RNA (B). The Watson and Crick Model The authors of the model \u2014 James Watson and Francis Crick (1953 a)have established that the DNA molecule is a double helix consisting oftwo complementary chains built from four bases \u2014 adenine (A), guanine(G), thymine (T) and [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","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":"","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":"set","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":[6],"tags":[],"class_list":["post-567","post","type-post","status-publish","format-standard","hentry","category-book"],"_links":{"self":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts\/567","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=567"}],"version-history":[{"count":1,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts\/567\/revisions"}],"predecessor-version":[{"id":610,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts\/567\/revisions\/610"}],"wp:attachment":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=567"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=567"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}