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The biology portion focuses on antibiotic mechanisms targeting bacterial ribosomes, including 30S/16S RNA features, STOP codon release factors, Gram-positive versus Gram-negative envelope differences, and selective drug effects such as tetracycline and PrAMPs. The chemistry portion examines Grignard reagents, electronegativity ideas, synthesis constraints, reaction stoichiometry, and hydrolysis in water.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/gamsat-sample-questions-section-iii-reasoning-in-biological-and-physical-sciences/448352/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/gamsat-sample-questions-section-iii-reasoning-in-biological-and-physical-sciences/448352.png","ImageObject",300,407,{"name":92,"@type":93},"BigDaveOnline","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-09","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What key concepts in antibiotic mechanisms are tested in Questions 1–5?","Question",{"text":112,"@type":113},"The questions test how antibiotics targeting ribosomes interfere with protein synthesis, including the role of the 16S rRNA loop, release factors that recognize STOP codons, and differences between antibiotic classes such as tetracycline, chloramphenicol, and PrAMPs.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Why are aminoglycosides less effective against anaerobic bacteria (Question 3)?",{"text":117,"@type":113},"Because aminoglycoside uptake is described as energy-demanding, so bacteria that are anaerobic are less able to support effective uptake.",{"name":119,"@type":110,"acceptedAnswer":120},"What does the document say about Grignard reagents reacting with water (Question 9)?",{"text":121,"@type":113},"It states that due to the reactivity of the C–Mg bond, Grignard reagents break down in water, and it asks which reaction equation correctly represents this process.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},448352,1790820659,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},962090896214,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","GAMSAT Sample Questions  \nSection III  \nReasoning in Biological and Physical Sciences  \nQuestions 1 – 5  \nThe bacterial ribosome is targeted by over 60% of naturally derived antibiotics. Compromising protein synthesis makes metabolism, signalling, motility and many other crucial cellular functions impossible. Targets and mechanisms of action for selected ribosome-targeting antibiotics are described in Table 1 and illustrated in Figure 1.  \nFigure 1  \nTable 1  \n1  [www.medify.co.uk](www.medify.co.uk)  \nThe 30S subunit of the ribosome contains a 16S ribosomal RNA strand, which has a conserved loop of three unpaired adenine residues. When codon–anticodon pairing is correct, this loop bulges out and allows translation to proceed.  \nRelease factors are necessary to recognise STOP codons in mRNA and initiate dissociation of the synthesised protein from the ribosome.  \nPrAMP stands for proline-rich antimicrobial peptide.  \nThe envelope of Gram-positive bacteria consists of a thick cell wall and one inner plasma membrane. In Gram-negative bacteria, this envelope consists of a thin cell wall and two – inner and outer – plasma membranes.  \n1 The graph below shows the rate of new protein synthesis in an untreated Escherichia coli culture (dashed line) and E. coli treated with three different classes of antibiotics (A, B, C) . Which types of antibiotics could have been used to treat the cultures?  \nA A – type II PrAMP, B – sparsomycin, C – tetracycline  \nB A – sparsomycin, B – aminoglycoside, C – tetracycline  \nC A – macrolide, B – type II PrAMP, C-chloramphenicol  \nD A – sparsomycin, B – chloramphenicol, C – type I PrAMP  \n2 Which of the following adaptations would improve survival of bacteria in presence of type II PrAMPs?  \nA synthesis of a PrAMP importer  \nB overexpression of release factors  \nC loss ofthe release factor–ribosome binding site  \nD increase in release factor–ribosome binding affinity  \n 2  [www.medify.co.uk](www.medify.co.uk)  \n3 Aminoglycoside uptake into bacteria is an energy-demanding process. As a result, aminoglycosides are less effective against  \nA motile bacteria.  \nB anaerobic bacteria.  \nC Gram-positive bacteria.  \nD colony-forming bacteria.  \n4 Consider the following statements:  \nI. Prokaryotes use certain codons more or less frequently than eukaryotes.  \nII. Prokaryotic and eukaryotic ribosomes contain different rRNA and ribosomal proteins.  \nIII. Prokaryotes and eukaryotes express different membrane transport proteins.  \nWhich statement(s) explain why tetracycline is effective against bacteria but harmless to humans?  \nA Statements I, II and III explain tetracycline specificity.  \nB Statements I and III, but not statement II, explain tetracycline specificity.  \nC Statements II and III, but not statement I, explain tetracycline specificity.  \nD Statement II, but not statements I and III, explain tetracycline specificity.  \n5 A bacterium gains several mutations that cause a complete structural rearrangement of the A site within the 50S ribosomal subunit while still maintaining functionality. This bacterium is likely to be  \nA non-viable.  \nB susceptible to type I PrAMPs.  \nC resistant to chloramphenicol.  \nD resistant to tetracyclines and aminoglycosides.  \n 3  [www.medify.co.uk](www.medify.co.uk)  \nQuestions 6 – 9  \nA Grignard reagent is an organomagnesium halide, featuring a covalent carbon-magnesium and an ionic magnesiumhalogen bond. A typical formula is R―Mg+X-, where R is an organic residue and X is a halogen. Grignard reagents are synthesised by treating an organohalide, e.g. CH3Br, with metallic magnesium (note that this mechanism relies on single electron transfer, marked by half-arrows and dots):  \nDue to their electronegativity properties of component atoms, Grignard reagents are extremely useful for synthesis of new C–C bonds. A common mechanism is a reaction between a Grignard reagent and a carbonyl group:  \nTable 1 lists electronegativity values of some elements.  \nTable 1  \n6 In Grignard reage","cbCaitrbFG4SuHOF","https://ap.wps.com/l/cbCaitrbFG4SuHOF","pdf",932703,13,"English","# Questions 1 – 5\n## Antibiotics and ribosome targeting\n# Questions 6 – 9\n## Grignard reagents\n# Questions 10 – 13\n## Human body diagram and pressure reasoning","[{\"question\":\"What key concepts in antibiotic mechanisms are tested in Questions 1–5?\",\"answer\":\"The questions test how antibiotics targeting ribosomes interfere with protein synthesis, including the role of the 16S rRNA loop, release factors that recognize STOP codons, and differences between antibiotic classes such as tetracycline, chloramphenicol, and PrAMPs.\"},{\"question\":\"Why are aminoglycosides less effective against anaerobic bacteria (Question 3)?\",\"answer\":\"Because aminoglycoside uptake is described as energy-demanding, so bacteria that are anaerobic are less able to support effective uptake.\"},{\"question\":\"What does the document say about Grignard reagents reacting with water (Question 9)?\",\"answer\":\"It states that due to the reactivity of the C–Mg bond, Grignard reagents break down in water, and it asks which reaction equation correctly represents this process.\"}]","GAMSAT Sample Questions - Section III - Reasoning in Biological and Physical Sciences | PDF",1790726714,33]