[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxLN3MUwXCdr5RPjwZYIDpOj8CHyjOmngWTgoKXPtZbg":3,"$f73eonTA2xVByXR1Hgyex6kdouu4EqwYi3m-y5MIVIRU":32,"$f3Ft0rKFJHppdzE-vuveecxx1BUcg9iOlMLtyzf_MJDg":92},[4,8,12,16,20,24,28],{"title":5,"slug":6,"path":7},"About Microbeonline.com","about-microbeonline-com","\u002Fabout-microbeonline-com\u002F",{"title":9,"slug":10,"path":11},"About Me","about-me","\u002Fabout-microbeonline-com\u002Fabout-me\u002F",{"title":13,"slug":14,"path":15},"Advertise with Us","advertise-us","\u002Fadvertise-us\u002F",{"title":17,"slug":18,"path":19},"Privacy Policy","privacy-policy","\u002Fprivacy-policy\u002F",{"title":21,"slug":22,"path":23},"Abbreviations","abbreviations","\u002Fabbreviations\u002F",{"title":25,"slug":26,"path":27},"Microbes","microbes","\u002Fmicrobes\u002F",{"title":29,"slug":30,"path":31},"Books","recommended-books","\u002Frecommended-books\u002F",{"type":33,"data":34},"blog",{"slug":35,"title":36,"description":36,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":39,"lastUpdatedDate":40,"draft":41,"category":42,"image":37,"body":43,"faq":44,"tags":45,"related":47},"mcq-immunology-antibodies","MCQ Immunology (86-100): Antibodies-II with Answers",null,"Acharya Tankeshwar","2012-04-10","2026-07-12",false,"mcqs","Immunoglobulins, also known as antibodies, are glycoprotein molecules produced by effector B cells (plasma cells). By now, you might have accumulated vast knowledge about these antibodies, their structural differences, functional differences, unique features, and applications in diagnostics.\n\nIn this set of 10 MCQs about antibodies, you can find questions related to the different properties of antibodies. Take a copy and a pencil, and write down answers to each question as you proceed. At the end of this post, you will get an answer key with descriptions. Check your answer with the given answer keys and keep improving your understanding.\n\n![](https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002FImmunoglobulin-Variations.png)86\\. Which of the following antibody is an important host defense against encapsulated a. IgG1\\\nb. IgG2\\\nc. IgG3\\\nd. IgG4\n\n87\\. Which of the following immunoglobulin is the most abundant immunoglobulin in newborns?\\\na. IgA\\\nb. IgM\\\nc. IgG\\\nd. IgD\n\n88\\. Which of the following immunoglobulin is produced early in the primary response to infection?\\\na. IgE\\\nb. IgA\\\nc. IgG\\\nd. IgM\n\n89\\. Which of the following immunoglobulin is the primary host defense against parasitic infections?\\\na. Secretory IgA\\\nb. IgG\\\nc. IgM\\\nd. IgE\n\n90\\. Which of the following immunoglobulin has the highest avidity of the immunoglobulins?\\\na. IgA\\\nb. IgM\\\nc. IgE\\\nd. IgG\n\n**91. The order of percent of total immunoglobulin in serum is**\\\na. IgM, IgA, IgG, IgD, IgE\\\nb. IgG, IgA, IgM, IgE, IgD\\\nc. IgG, IgA, IgM, IgE, IgD\\\nd. IgG, IgA, IgM, IgD, IgE\n\n92\\. Which of the following antibody is a prominent antigen receptor expressed on B Cells?\\\na. IgG\\\nb. IgA\\\nc. IgM\\\nd. IgE\n\n93\\. The antibody which is found in secretions is:\\\na. IgD\\\nb. IgE\\\nc. IgG\\\nd. IgA\n\n94\\. Which of the following antibodies directly participate in the opsonization process?a. IgM\\\nb. IgG\\\nc. IgA\\\nd. IgE\n\n95\\. Complement fixation is one of the most crucial host defenses against infections. The complement is activated by;\\\na. IgM Only\\\nb. IgG only\\\nc. both IgM and IgG\\\nd. all five classes of antibodies activate complements.\n\n96\\. Which type of antibody is MOST effective inactivating complement?\\\nA) IgG1\\\nB) IgG2\\\nC) IgG3\\\nD) [IgM](\u002Figm-antibody-structure-properties-functions-clinical-significance\u002F)\n\n## ANSWERS\n\n**86. b: IgG2**\\\nThe IgG2-subclass deficiency is associated with a diminished immune response to (bacterial capsular) polysaccharide antigens.\n\n87.c (IgG).\\\nIgG can cross the placenta and establish passive immunity. Infants also get secretory IgA (SIgA) via breastfeeding.\n\n88\\. d (IgM)\\\nImmunoglobulin M (IgM) antibodies are produced as a body’s first response to a new infection. \n\n89\\. d (IgE)\\\nIgE is involved in allergic reactions and immune responses to helminths and protozoan pathogens. \n\n90\\. b (IgM)\\\nAvidity is a measure of the total binding strength. As IgM can exist as a pentameric form, it has the highest avidity.\n\n91\\. d (IgG> IgA >IgM > IgD >IgE)\\\nAbout 70-80% of the immunoglobulins in the blood are IgG and IgE is the least abundant immunoglobulin in the serum.\n\n92\\. c (IgM).Mature B cells have both immunoglobulin M (IgM) and IgD types of BCRs and IgM type BCRs are more common.\n\n **93. d (IgA)**[Immunoglobulin A (IgA)](\u002Fimmunoglobulin-iga-structure-functions\u002F) often exists in a monomeric state when in the bloodstream but is secreted into the lumen of mucosal surfaces in a dimeric form. IgA can be found in saliva, tears, respiratory, gastrointestinal, and genitourinary secretions.\n\n94\\. b (IgG)\\\nBacteria Opsonization occurs when immunoglobulin G (IgG) molecules bind to specific epitopes on bacterial surface antigens through the antigen-binding site, leaving the Fc region exposed. Phagocytes possess Fc gamma receptors and can bind to the Fc-coated bacteria and internalize them.\n\n**95. c (both IgM and IgG)**\n\n**96. D (IgM)**",[],[46],"immunology-mcqs",[48,54,61,67,73,78,84],{"slug":49,"title":50,"description":50,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":51,"lastUpdatedDate":40,"draft":41,"category":42,"image":37,"faq":52,"tags":53},"multiple-choice-questions-on-basic-immunology-concepts","MCQs Immunology (41-55): Basic Immunology with Answers","2013-01-29",[],[46],{"slug":55,"title":56,"description":56,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":57,"lastUpdatedDate":40,"draft":41,"category":42,"image":58,"faq":59,"tags":60},"mcq-medical-microbiology-immunology-21-30","MCQs in Immunology (21-30): Antibodies-I (Answers with Explanations)","2013-01-15","https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Fmcqs-medical-microbiology-immunology-21-30.png",[],[46],{"slug":62,"title":63,"description":63,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":57,"lastUpdatedDate":40,"draft":41,"category":42,"image":64,"faq":65,"tags":66},"mcqs-in-immunology-complement-system-31-40","MCQs Immunology (31-40): Complement System with Answers","https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Fmcqs-immunology-complement-system-with-answers.png",[],[46],{"slug":68,"title":69,"description":69,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":70,"lastUpdatedDate":40,"draft":41,"category":42,"image":37,"faq":71,"tags":72},"mcq-in-medical-microbiology-immunology-mcqs-1-10","Immunology MCQs (1-10): Answers with Explanations","2013-01-14",[],[46],{"slug":74,"title":75,"description":75,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":70,"lastUpdatedDate":40,"draft":41,"category":42,"image":37,"faq":76,"tags":77},"mcq-in-medical-microbiology-immunology-mcqs-11-20","Immunology MCQs (11-20): Answers with Explanations",[],[46],{"slug":79,"title":80,"description":80,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":81,"lastUpdatedDate":40,"draft":41,"category":42,"image":37,"faq":82,"tags":83},"mcq-in-microbiology-immunology-questions-and-answers-with-explanation","MCQ in Immunology (71-85): Basic Concepts Answers with Explanation","2012-11-27",[],[46],{"slug":85,"title":86,"description":86,"seoTitle":37,"seoDescription":37,"author":38,"createdDate":87,"lastUpdatedDate":88,"draft":41,"category":42,"image":37,"faq":89,"tags":90},"mcq-immunology-3","MCQ Immunology (56-70): Hypersensitivity Answers with Explanations","2010-04-18","2026-07-21",[],[46,91],"hypersensitivity",[93,99,106,111,115,119,124,129,133,137],{"slug":94,"name":38,"description":95,"image":96,"body":97,"postCount":98},"acharya-tankeshwar","Editor-in-chief","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Ftankeshwar-acharya-author-microbeonline.jpg","***Tankeshwar Acharya, MSc (Medical Microbiology)***\n\n*Tankeshwar Acharya is an Assistant Professor in the Department of Microbiology at Patan Academy of Health Sciences (PAHS), Nepal, where he has been teaching and practicing clinical microbiology for over 14 years. He is the founder of Microbe Online, one of the leading free microbiology education resources on the web, covering bacteriology, mycology, parasitology, immunology, and clinical laboratory diagnostics written from direct experience in both the classroom and the diagnostic laboratory.*",433,{"slug":100,"name":101,"description":102,"image":103,"body":104,"postCount":105},"ashma-shrestha","Ashma Shrestha","SEO Copywriter and Science Communicator\nKathmandu, Nepal","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fashma-shrestha.png","Ashma Shrestha holds a Master of Science in Medical Microbiology from the Institute of Science and Technology (IOST), Tribhuvan University, Nepal, where she developed a strong foundation in virology, molecular biology, and diagnostic microbiology.\n\nShe now works as an SEO Copywriter at Resolution Digital, where she combines her scientific training with research-driven content strategy. She is certified in Google Analytics and Google Business Profile (GBP), and brings a data-informed approach to science communication writing content that is not only accurate but structured to reach and serve the students who need it most.\n\nAt microbeonline, Ashma contributes articles primarily in virology and molecular biology, areas she finds most compelling for their mechanistic depth and their growing clinical relevance. Her writing reflects the same standard the site is built on: factual rigor, clear explanation of the *why* behind microbiology concepts, and content that helps students move from memorization to genuine understanding.\n\nShe is passionate about making complex microbiological concepts accessible without sacrificing accuracy; a skill that sits at the intersection of her scientific training and her professional work in content and SEO.",81,{"slug":107,"name":108,"description":109,"image":37,"body":37,"postCount":110},"sushmita-baniya","Sushmita Baniya","Author \u002F Contributor",32,{"slug":112,"name":113,"description":109,"image":37,"body":37,"postCount":114},"samikshya-acharya","Samikshya Acharya",20,{"slug":116,"name":117,"description":109,"image":37,"body":37,"postCount":118},"alisha-tripathi","Alisha Tripathi",6,{"slug":120,"name":121,"description":122,"image":37,"body":37,"postCount":123},"aastha-shrestha","Aastha Shrestha"," Author \u002F Contributor",10,{"slug":125,"name":126,"description":127,"image":37,"body":37,"postCount":128},"guest-author","Guest Author","Guest Author \u002F Contributor",2,{"slug":130,"name":131,"description":109,"image":37,"body":37,"postCount":132},"srijana-khanal","Srijana Khanal",18,{"slug":134,"name":135,"description":127,"image":37,"body":37,"postCount":136},"dr-poonam-acharya","Dr. Poonam Acharya",1,{"slug":138,"name":139,"description":109,"image":37,"body":140,"postCount":141},"nisha-rijal","Nisha Rijal","**Nisha Rijal** is a microbiologist and quality assurance specialist. She served for nearly 12 years as a microbiologist at the National Public Health Laboratory (NPHL), Nepal's national reference laboratory, and continues to work as a consultant microbiologist in international public health organization. ",51]