YPurine vs Pyrimidine
Nucleic acids yog macro molecules tsim los ntawm kev sib xyaw ntawm ntau txhiab nucleotides. Lawv muaj C, H, N, O, thiab P. Muaj ob hom nucleic acids hauv cov kab mob lom neeg xws li DNA thiab RNA. Lawv yog cov khoom siv caj ces ntawm lub cev thiab muaj lub luag haujlwm rau kev hla cov yam ntxwv ntawm caj ces los ntawm ib tiam dhau ib tiam. Tsis tas li ntawd, lawv tseem ceeb heev rau kev tswj thiab tswj cov haujlwm ntawm tes. Ib tug nucleotide yog tsim los ntawm peb units. Nws muaj pentose qab zib molecule, nitrogenous puag thiab phosphate pawg. Feem ntau muaj ob pawg ntawm nitrogenous hauv paus ua purines thiab pyrimidines. Lawv yog heterocyclic organic molecules. Cytosine, thymine, thiab uracil yog cov piv txwv rau pyrimidine hauv paus. Adenine thiab guanine yog ob lub hauv paus purine. DNA muaj adenine, Guanine, cytosine, thiab thymine bases, whereas RNA muaj A, G, C, thiab uracil (tsis yog thymine). Hauv DNA thiab RNA, cov hauv paus pub dawb tsim hydrogen bonds ntawm lawv. Qhov ntawd yog adenine: thiamine / uracil thiab guanine: cytosine yog ib qho pub dawb rau ib leeg.
Purine
Purine yog cov tshuaj tsw qab organic. Nws yog ib qho heterocyclic compound uas muaj nitrogen. Nyob rau hauv purine, muaj ib lub nplhaib pyrimidine thiab fused imidazole nplhaib. Nws muaj cov qauv hauv qab no.
Purines thiab lawv cov tshuaj hloov pauv tau dav dav hauv cov xwm txheej. Lawv muaj nyob rau hauv nucleic acid. Ob lub purine molecules, adenine thiab guanine, muaj nyob hauv DNA thiab RNA. Amino pawg thiab pawg ketone tau txuas nrog cov qauv purine hauv paus los ua adenine thiab guanine. Lawv muaj cov qauv hauv qab no.
Nyob rau hauv nucleic acids, purine pawg ua hydrogen bonds nrog ntxiv pyrimidine bases. Qhov ntawd yog adenine ua hydrogen bonds nrog thymine thiab guanine ua hydrogen bonds nrog cytosine. Hauv RNA, txij li thymine tsis tuaj, adenine ua hydrogen bonds nrog uracil. Qhov no yog hu ua complementary base pairing uas yog qhov tseem ceeb rau nucleic acids. Lub hauv paus khub no yog ib qho tseem ceeb rau cov tsiaj nyob rau evolution.
Lwm yam tshaj li cov purines no, muaj ntau lwm cov purines xws li xanthine, hypoxanthine, uric acid, caffeine, isoguanine, thiab lwm yam tshaj li cov nucleic acids, lawv muaj nyob rau hauv ATP, GTP, NADH, coenzyme A, thiab lwm yam. Muaj ntau txoj hauv kev metabolic hauv ntau cov kab mob los ua ke thiab rhuav tshem cov purines. Kev tsis zoo ntawm cov enzymes hauv txoj hauv kev no tuaj yeem ua rau muaj kev cuam tshuam loj rau tib neeg xws li ua rau mob qog noj ntshav. Purines muaj ntau nyob rau hauv cov nqaij thiab nqaij cov khoom.
YPyrimidine
Pyrimidine yog ib qho tshuaj tsw qab heterocyclic. Nws zoo ib yam li benzene tshwj tsis yog pyrimidine muaj ob lub nitrogen atoms. Cov nitrogen atoms yog nyob rau ntawm 1 thiab 3 txoj hauj lwm nyob rau hauv lub rau lub nplhaib. Nws muaj cov qauv hauv qab no.
Pyrimidine muaj cov khoom sib xws nrog pyridine. Nucleophilic aromatic hloov pauv tau yooj yim dua nrog cov tebchaw no dua li cov khoom siv hluav taws xob uas muaj ntxhiab tsw qab vim muaj nitrogen atoms. Cov pyrimidines pom nyob rau hauv nucleic acids yog hloov cov tebchaw ntawm cov qauv pyrimidine.
Muaj peb cov pyrimidine derivatives pom hauv DNA thiab RNA. Cov no yog cytosine, thymine, thiab uracil. Lawv muaj cov qauv hauv qab no.
Qhov txawv ntawm Purine thiab Pyrimidine yog dab tsi?
• Pyrimidine muaj ib lub nplhaib thiab purine muaj ob lub nplhaib.
• Purine muaj lub nplhaib pyrimidine thiab lub nplhaib imidazole.
• Adenine thiab guanine yog cov purine derivative muaj nyob rau hauv nucleic acids whereas cytosine, uracil thiab thymine yog pyrimidine derivatives muaj nyob rau hauv cov nucleic acids.
• Purines muaj kev sib cuam tshuam ntau dua li pyrimidines.
• Cov ntsiab lus melting thiab boiling point ntawm purines ntau dua piv rau pyrimidines.
