Which polysaccharide, found in red algal cell walls, is a useful solidifying agent? <\/p>\n\n\n\n
1) chitin 2) cellulose 3) phycoerythrin 4) agar<\/p>\n\n\n\n
The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n The correct answer is 4) agar<\/strong>.<\/p>\n\n\n\n Agar is a polysaccharide found in the cell walls of red algae, particularly in species of Gelidium<\/em> and Gracilaria<\/em>. It is commonly used as a solidifying agent in microbiological media and in food production. Agar is a gelatinous substance that has the unique ability to remain solid at a wide range of temperatures, which makes it especially useful for creating solid surfaces for growing bacteria and other microorganisms.<\/p>\n\n\n\n Agar is primarily composed of two polysaccharides: agarose and agaropectin. Agarose is the component responsible for its solidifying properties, forming a gel when dissolved in boiling water and then cooled. This ability to form gels has made agar a versatile tool in laboratories and kitchens. In microbiology, agar is used to create a stable, non-nutritive medium for growing cultures of bacteria, fungi, and algae. Its ability to remain solid at body temperature (around 37\u00b0C) allows for the growth of organisms without the medium melting.<\/p>\n\n\n\n In food production, agar is also used as a thickening agent and in the making of jellies and desserts. Agar has several advantages over gelatin, another commonly used gelling agent. It is plant-based, which makes it suitable for vegetarians and vegans. Additionally, it has a higher melting point than gelatin, so it remains firm at higher temperatures, making it useful in certain types of confectionery.<\/p>\n\n\n\n In contrast, chitin<\/strong> is found in the exoskeletons of arthropods, cellulose<\/strong> is a major structural component of plant cell walls, and phycoerythrin<\/strong> is a protein found in the pigment complex of red algae that helps in photosynthesis. These substances do not have the same gelling or solidifying properties as agar.<\/p>\n","protected":false},"excerpt":{"rendered":" Which polysaccharide, found in red algal cell walls, is a useful solidifying agent? 1) chitin 2) cellulose 3) phycoerythrin 4) agar The correct answer and explanation is: The correct answer is 4) agar. Agar is a polysaccharide found in the cell walls of red algae, particularly in species of Gelidium and Gracilaria. It is commonly […]<\/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-265387","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/265387","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=265387"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/265387\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=265387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=265387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=265387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}