Video: Dab tsi yog daim ntawv cog lus hauv DNA?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
DNA ob chav helix muaj ob hom kev sib cog lus, covalent thiab hydrogen . Covalent daim ntawv cog lus muaj nyob rau hauv txhua txoj kab sib txuas thiab sib zog ua ke hauv paus, suab thaj, thiab phosphate pawg (ob qho tib si hauv txhua qhov khoom thiab nruab nrab ntawm cov khoom).
Ib yam li ntawd, koj tuaj yeem nug, qhov twg yog covalent bonds pom hauv DNA?
Covalent bonds tshwm sim nyob rau hauv txhua linear strand thiab muaj zog daim ntawv cog lus cov hauv paus, suab thaj, thiab phosphate pawg (ob qho tib si hauv txhua qhov khoom thiab nruab nrab ntawm cov khoom). Hydrogen daim ntawv cog lus tshwm sim ntawm ob lub strands thiab koom nrog lub hauv paus los ntawm ib txoj hlua nrog lub hauv paus los ntawm qhov thib ob hauv kev sib koom ua ke.
Tsis tas li ntawd, hom ntawv cog lus twg yog phosphodiester daim ntawv cog lus? A phosphodiester daim ntawv cog lus tshwm sim thaum ob ntawm pawg hydroxyl hauv phosphoric acid hnov mob nrog hydroxyl pawg ntawm lwm cov molecules rau daim ntawv ob ester daim ntawv cog lus . Ib qho piv txwv yog pom nyob rau hauv kev sib txuas ntawm ob pentose (5 carbon qab zib) rings rau ib pawg phosphate los ntawm cov muaj zog, covalent ester daim ntawv cog lus.
Cov lus nug tseem yog, phosphodiester daim ntawv cog lus hauv DNA yog dab tsi?
Hauv DNA thiab RNA, lub phosphodiester daim ntawv cog lus yog cov kev sib txuas nruab nrab ntawm 3' carbon atom ntawm ib lub suab thaj molecule thiab 5' carbon atom ntawm lwm tus, deoxyribose hauv DNA thiab ribose hauv RNA. Muaj zog covalent daim ntawv cog lus daim ntawv ntawm phosphate pawg thiab ob 5-carbon nplhaib carbohydrates (pentoses) tshaj ob ester daim ntawv cog lus.
Dab tsi ntawm daim ntawv cog lus txuas qab zib thiab phosphate hauv DNA?
Cov daim ntawv cog lus tsim ntawm lub qab zib ntawm ib tug nucleotide thiab cov phosphate ntawm ib qho nucleotide uas nyob ib sab yog covalent daim ntawv cog lus . Ib covalent daim ntawv cog lus yog kev sib koom ntawm electrons ntawm atoms. Ib covalent daim ntawv cog lus muaj zog dua li hydrogen daim ntawv cog lus (hydrogen daim ntawv cog lus tuav khub ntawm nucleotides ua ke ntawm opposite strands nyob rau hauv DNA ).
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