[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fMehWpZnHczQ8pG57-nMGRl2u551e9Zlso6OoupMj9zo":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2025-12-18 21:17:14",272561005,[8,9,10,11],"Homologous sequences in different species that share an ancestral gene","Homologous sequences that share little amino acid identity but share great structural similarity","Homologous sequences in the same species that arose through gene duplication","Homologous sequences in the same species which have similar and often redundant functions",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},7,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","exam_167054186","","Orthologs are defined as ( )",[21,26,35,44,53,62,71],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],272561006,[30,31,32,33],"Global alignment is usually used forDNAsequences, while local alignment is usually used for protein sequences","Global alignment has gaps, while local alignment does not have gaps","Global alignment finds the global maximum, while local alignment finds the local maximum","Global alignment aligns the whole sequence, while local alignment finds the best subsequence that aligns","Which of the following sentences best describes the difference between a global alignment and a local alignment between two sequences",{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":24,"type":25},[],272561007,[39,40,41,42],"全局比对通常用于比对DNA序列,而局部比对通常用于比对蛋白质序列","全局比对允许间隙,而局部比对不允许","全局比对寻找全局最大化,而局部比对寻找局部最大化","全局比对比对整体序列,而局部比对寻找最佳匹配子序列","下列哪个句子最好的描述了两个序列全局比对和局部比对的不同:( )",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":24,"type":25},[],272561008,[48,49,50,51],"PAM250","PAM120","PAM 30","PAM 70","matrix should be used for aligning sequences that are about 20% similar",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":24,"type":25},[],272561009,[57,58,59,60],"1%","20%","80%","250%","PAM250矩阵定义的进化距离为两同源序列在给定的时间有多少百分比的氨基酸发生改变:( )",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":24,"type":25},[],272561010,[66,67,68,69],"Puts the two proteins being compared into a matrix and finds the optimal score by exhaustively searching every possible combination of alignments","Puts the two proteins being compared into a matrix and finds the optimal score by iterative recursions","Puts the two proteins being compared into a matrix and finds the optimal alignment by finding optimal subpaths that define the best alignment(s)","Can be used for proteins but not for DNA sequences %","A global alignment algorithm (such as the Needleman–Wunsch algorithm) is guaranteed to find an optimal alignment. ( )Such an algorithm",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":24,"type":25},[],272561011,[75,76,77,78],"BLOSUM 45","BLOSUM 62","BLOSUM 50","BLOSUM 90","NCBI 网页提供的blastp 服务默认的matrix是( )"]