{"id":85594,"date":"2025-06-01T03:22:16","date_gmt":"2025-06-01T03:22:16","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85594"},"modified":"2025-06-01T03:22:16","modified_gmt":"2025-06-01T03:22:16","slug":"biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/","title":{"rendered":"Biological catalysts are protein molecules which\n  1. speed up a chemi"},"content":{"rendered":"<p>Biological catalysts are protein molecules which<\/p>\n<ul>\n<li>1. speed up a chemical reaction<\/li>\n<li>2. remain unchanged after reaction<\/li>\n<li>3. function optimally at 37 \u00b0C<\/li>\n<li>4. do not have an enzymatic activity<\/li>\n<\/ul>\n<p>Select the correct answer using the code given below.<\/p>\n<p>[amp_mcq option1=&#8221;1 only&#8221; option2=&#8221;1, 2 and 3&#8243; option3=&#8221;2 and 3 only&#8221; option4=&#8221;1, 3 and 4&#8243; 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 CDS-2 &#8211; 2016<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-cds-2-2016.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-cds-2-2016\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nBiological catalysts (enzymes) are protein molecules that speed up chemical reactions, remain unchanged after the reaction, and function optimally at around 37 \u00b0C (in the human body).<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\n&#8211; Biological catalysts are enzymes, which are indeed protein molecules (with a few exceptions like catalytic RNA).<br \/>\n&#8211; Statement 1 is correct: Enzymes are catalysts, meaning they increase the rate of a chemical reaction without being consumed in the process.<br \/>\n&#8211; Statement 2 is correct: Like all catalysts, enzymes are not permanently altered or used up during the reaction and can be reused.<br \/>\n&#8211; Statement 3 is generally correct in the context of human enzymes: Many enzymes in the human body function optimally at physiological temperature, which is around 37 \u00b0C. However, the optimal temperature varies greatly among enzymes from different organisms (e.g., enzymes from thermophilic bacteria function at much higher temperatures). Assuming the question refers to typical biological contexts like the human body, this statement is considered correct.<br \/>\n&#8211; Statement 4 is incorrect: Biological catalysts *are* enzymes, and their activity *is* enzymatic activity. This statement directly contradicts the definition.<br \/>\n&#8211; Based on the statements, 1 and 2 are universally true for catalysts. Statement 3 is true for a common subset of biological catalysts (human enzymes). Statement 4 is false. The option including 1, 2, and 3 is the most fitting choice.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nEnzymes are highly specific for the substrates they act upon and the reactions they catalyze. Their activity is influenced by factors such as temperature, pH, and the presence of inhibitors or activators.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Biological catalysts are protein molecules which 1. speed up a chemical reaction 2. remain unchanged after reaction 3. function optimally at 37 \u00b0C 4. do not have an enzymatic activity Select the correct answer using the code given below. [amp_mcq option1=&#8221;1 only&#8221; option2=&#8221;1, 2 and 3&#8243; option3=&#8221;2 and 3 only&#8221; option4=&#8221;1, 3 and 4&#8243; correct=&#8221;option2&#8243;] &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Biological catalysts are protein molecules which\n  1. speed up a chemi\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/#more-85594\">Detailed Solution<span class=\"screen-reader-text\">Biological catalysts are protein molecules which<br \/>\n  1. speed up a chemi<\/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":[1088],"tags":[1098,1117,1152],"class_list":["post-85594","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","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>Biological catalysts are protein molecules which  1. speed up a chemi<\/title>\n<meta name=\"description\" content=\"Biological catalysts (enzymes) are protein molecules that speed up chemical reactions, remain unchanged after the reaction, and function optimally at around 37 \u00b0C (in the human body). - Biological catalysts are enzymes, which are indeed protein molecules (with a few exceptions like catalytic RNA). - Statement 1 is correct: Enzymes are catalysts, meaning they increase the rate of a chemical reaction without being consumed in the process. - Statement 2 is correct: Like all catalysts, enzymes are not permanently altered or used up during the reaction and can be reused. - Statement 3 is generally correct in the context of human enzymes: Many enzymes in the human body function optimally at physiological temperature, which is around 37 \u00b0C. However, the optimal temperature varies greatly among enzymes from different organisms (e.g., enzymes from thermophilic bacteria function at much higher temperatures). Assuming the question refers to typical biological contexts like the human body, this statement is considered correct. - Statement 4 is incorrect: Biological catalysts *are* enzymes, and their activity *is* enzymatic activity. This statement directly contradicts the definition. - Based on the statements, 1 and 2 are universally true for catalysts. Statement 3 is true for a common subset of biological catalysts (human enzymes). Statement 4 is false. The option including 1, 2, and 3 is the most fitting choice.\" \/>\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\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Biological catalysts are protein molecules which  1. speed up a chemi\" \/>\n<meta property=\"og:description\" content=\"Biological catalysts (enzymes) are protein molecules that speed up chemical reactions, remain unchanged after the reaction, and function optimally at around 37 \u00b0C (in the human body). - Biological catalysts are enzymes, which are indeed protein molecules (with a few exceptions like catalytic RNA). - Statement 1 is correct: Enzymes are catalysts, meaning they increase the rate of a chemical reaction without being consumed in the process. - Statement 2 is correct: Like all catalysts, enzymes are not permanently altered or used up during the reaction and can be reused. - Statement 3 is generally correct in the context of human enzymes: Many enzymes in the human body function optimally at physiological temperature, which is around 37 \u00b0C. However, the optimal temperature varies greatly among enzymes from different organisms (e.g., enzymes from thermophilic bacteria function at much higher temperatures). Assuming the question refers to typical biological contexts like the human body, this statement is considered correct. - Statement 4 is incorrect: Biological catalysts *are* enzymes, and their activity *is* enzymatic activity. This statement directly contradicts the definition. - Based on the statements, 1 and 2 are universally true for catalysts. Statement 3 is true for a common subset of biological catalysts (human enzymes). Statement 4 is false. The option including 1, 2, and 3 is the most fitting choice.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:22:16+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=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Biological catalysts are protein molecules which  1. speed up a chemi","description":"Biological catalysts (enzymes) are protein molecules that speed up chemical reactions, remain unchanged after the reaction, and function optimally at around 37 \u00b0C (in the human body). - Biological catalysts are enzymes, which are indeed protein molecules (with a few exceptions like catalytic RNA). - Statement 1 is correct: Enzymes are catalysts, meaning they increase the rate of a chemical reaction without being consumed in the process. - Statement 2 is correct: Like all catalysts, enzymes are not permanently altered or used up during the reaction and can be reused. - Statement 3 is generally correct in the context of human enzymes: Many enzymes in the human body function optimally at physiological temperature, which is around 37 \u00b0C. However, the optimal temperature varies greatly among enzymes from different organisms (e.g., enzymes from thermophilic bacteria function at much higher temperatures). Assuming the question refers to typical biological contexts like the human body, this statement is considered correct. - Statement 4 is incorrect: Biological catalysts *are* enzymes, and their activity *is* enzymatic activity. This statement directly contradicts the definition. - Based on the statements, 1 and 2 are universally true for catalysts. Statement 3 is true for a common subset of biological catalysts (human enzymes). Statement 4 is false. The option including 1, 2, and 3 is the most fitting choice.","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\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/","og_locale":"en_US","og_type":"article","og_title":"Biological catalysts are protein molecules which  1. speed up a chemi","og_description":"Biological catalysts (enzymes) are protein molecules that speed up chemical reactions, remain unchanged after the reaction, and function optimally at around 37 \u00b0C (in the human body). - Biological catalysts are enzymes, which are indeed protein molecules (with a few exceptions like catalytic RNA). - Statement 1 is correct: Enzymes are catalysts, meaning they increase the rate of a chemical reaction without being consumed in the process. - Statement 2 is correct: Like all catalysts, enzymes are not permanently altered or used up during the reaction and can be reused. - Statement 3 is generally correct in the context of human enzymes: Many enzymes in the human body function optimally at physiological temperature, which is around 37 \u00b0C. However, the optimal temperature varies greatly among enzymes from different organisms (e.g., enzymes from thermophilic bacteria function at much higher temperatures). Assuming the question refers to typical biological contexts like the human body, this statement is considered correct. - Statement 4 is incorrect: Biological catalysts *are* enzymes, and their activity *is* enzymatic activity. This statement directly contradicts the definition. - Based on the statements, 1 and 2 are universally true for catalysts. Statement 3 is true for a common subset of biological catalysts (human enzymes). Statement 4 is false. The option including 1, 2, and 3 is the most fitting choice.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:22:16+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/","url":"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/","name":"Biological catalysts are protein molecules which 1. speed up a chemi","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:22:16+00:00","dateModified":"2025-06-01T03:22:16+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Biological catalysts (enzymes) are protein molecules that speed up chemical reactions, remain unchanged after the reaction, and function optimally at around 37 \u00b0C (in the human body). - Biological catalysts are enzymes, which are indeed protein molecules (with a few exceptions like catalytic RNA). - Statement 1 is correct: Enzymes are catalysts, meaning they increase the rate of a chemical reaction without being consumed in the process. - Statement 2 is correct: Like all catalysts, enzymes are not permanently altered or used up during the reaction and can be reused. - Statement 3 is generally correct in the context of human enzymes: Many enzymes in the human body function optimally at physiological temperature, which is around 37 \u00b0C. However, the optimal temperature varies greatly among enzymes from different organisms (e.g., enzymes from thermophilic bacteria function at much higher temperatures). Assuming the question refers to typical biological contexts like the human body, this statement is considered correct. - Statement 4 is incorrect: Biological catalysts *are* enzymes, and their activity *is* enzymatic activity. This statement directly contradicts the definition. - Based on the statements, 1 and 2 are universally true for catalysts. Statement 3 is true for a common subset of biological catalysts (human enzymes). Statement 4 is false. The option including 1, 2, and 3 is the most fitting choice.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/biological-catalysts-are-protein-molecules-which-1-speed-up-a-chemi\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-2","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-2\/"},{"@type":"ListItem","position":3,"name":"Biological catalysts are protein molecules which 1. speed up a chemi"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/85594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=85594"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/85594\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=85594"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=85594"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=85594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}