If an mRNA is 465bp from start to stop codon, how many amino acids does it encode? If DNA had only two types of bases instead of four, how long would codons need to be to specify all 20 amino acids? How many DNA sequences of length 19 have...
How many different codons code for amino acids? In DNA, which nitrogenous base pairs with adenine? How are genetic characteristics linked with DNA structure? What are the nucleotides involved in DNA synthesis? What is the directionality of both DNA strands in the replication fork?
系统标签: 互译 词汇 supersecondary dna amino acids Morethanonecodoncanspecifythesameaminoacidandallcodonsareunambiguousinthateach specifiesnomorethanoneaminoacid. Denaturation. 变性 Destroythesecondary,tertiary,andquaternarystructureofaprotein,DNA,orRNA molecule. DNAdamage. DNA损伤 DNAdamageisthatchangesinthe...
c. contains a sequence of triplet codons that specify amino acids. d. all of the choices. ___ 31. Peptide bonds link a. nucleotides in rRNA. b. nucleotides in a tRNA. c. nucleotides in an mRNA. d. amino acids in a polypeptide. ___ 32. RNA polymerase reads nucleotide bases ___ ...
trnaaminoacylcodon诺贝尔奖codonsanticodon 科恩伯格现年59岁,目前供职于美国斯坦福大学医学院,他的父亲阿瑟·科恩伯格是1959年的诺贝尔医学或生理学奖得主之一。科恩伯格揭示了真核生物体内的细胞如何利用基因内存储的信息生产蛋白质,而理解这一点具有医学上的“基础性”作用,因为人类的多种疾病如癌症、心脏病等都与这一过...
1954年,G.Gamov对破译密码首先提出了设想2FeaturesofgeneticcodonsStopcodonUAAUAGUGAStartcodonAUGMetUGGTrp18aminoacidshavemorethanonecodon,calledsynonymouscodons(同义密码子).Generallytheydifferonlyintheirthirdposition.Inallcases,ifthethirdpositionispyrimidine,thecodonsspecifythesameAA.Inmostcases,ifthethirdposition...
(whichspecifiesmethionine)=startcodon AUGspecifiesadditionalmethionineswithinthecodingsequence UAA,UAGandUGA=termination,orstop,codons Thecodeisdegenerate Morethanonecodoncanspecifythesameaminoacid Forexample:GGU,GGC,GGAandGGGallcodeforlysine Inmostinstances,thethirdbaseisthedegeneratebase Itissometimereferredtoast...
proteins.CodonsareorderedsequencesofthreenucleotidesoftheA,G,C,U.Proteinsynthesisinalleukaryoticcellsperformsinthecytoplasm.Thegenesbytheircodonscontrolamino-acidsequencesinpro-teins.Itisobviousthatthereare4×4×4=64possiblecodons.However61ofthemspecifythe20differentamino-acidsand3correspondtostop-codons,which...
regulatedbyattenuation.Thefirsteightcodonsoftheleader specifyapeptidethatinhibitspeptidyltranseraseinvitro. Functionallysimilar,butlessinhibitory,peptidesareencoded bytheleadersofCm-induciblecatgenes.However,thecatand cmlA oigsequencesareunrelatedandspecifyproteinsof unrelatedfunction.Theinhibitionofpeptidyltransferaseby...