Vir\u00fcsler hari\u00e7 t\u00fcm canl\u0131larda bulunur. Yakla\u015f\u0131k 15 – 20 nm. (150 – 200 A\u00b0) \u00e7a-p\u0131nda, hepsi birbirinin benzeri, k\u00fcremsi ya da oval partik\u00fcllerdir. H\u00fccrelerin en k\u00fc\u00e7\u00fck organelidir. \u00f6z\u00fcnde taban k\u0131s\u0131mlar\u0131yla birbirine mRNA (messenger RNA) arac\u0131l\u0131\u011f\u0131yla yap\u0131\u015fm\u0131\u015f biri b\u00fcy\u00fck (molek\u00fcler a\u011f\u0131rl\u0131\u011f\u0131 yakla\u015f\u0131k 1.300.000 dalton) di\u011feri k\u00fc\u00e7\u00fck (molek\u00fcler a\u011f\u0131rl\u0131\u011f\u0131 yakla\u015f\u0131k 600.000 dalton) iki alt birimden meydana gelmi\u015ftir.<\/p>\n
Bu birimler ancak mRNA’n\u0131n varl\u0131\u011f\u0131nda birbirlerine yap\u0131\u015f\u0131rlar, sentezleme i\u015flemi bitti\u011finde, ayr\u0131l\u0131r ve tekrar di\u011fer bir mRNA’n\u0131n varl\u0131\u011f\u0131nda ba\u015fka bir alt birimle bir araya gelirler. Say\u0131lar\u0131, gen\u00e7 ve \u00f6zellikle sentez yapan h\u00fccrelerde fazlad\u0131r; \u00f6rne\u011fin Escherichia coli bakteri h\u00fccresinde 6000, tav\u015fanlar\u0131n retik\u00fclosit h\u00fccrelerinde ise 100.000 kadard\u0131r. H\u00fccrelerde ya tek tek (monomer ribozomlar) ya da mRNA arac\u0131l\u0131\u011f\u0131yla iki alt birimi birle\u015ftirilmi\u015f bir\u00e7ok ribozom ta\u015f\u0131yan bir tespih \u015feklindedir (\u015eekil 8.18 ve 34). Bu sonunculara poliribozomlar ya da sadece potizomlar denir, Polizom-daki ribozom say\u0131\u015f\u0131 mRNA’n\u0131n uzunlu\u011funa ba\u011fl\u0131d\u0131r. \u00d6rne\u011fin, bu, hemoglobin sentezi yapan polizomlarda 5’dir. Protein, b\u00fcy\u00fck \u00f6l\u00e7\u00fcde poliribozomlarda sentezlenir. H\u00fcc*reler gen\u00e7ken sitoplazmada daha \u00e7ok serbest halde bulunmalar\u0131na kar\u015f\u0131n, ya\u015flan*d\u0131k\u00e7a ER kanalc\u0131klar\u0131na (her zaman d\u0131\u015f y\u00fcz\u00fcne) ba\u011flanma oranlar\u0131 y\u00fckselir (tanecikli ER). Bir g\u00f6r\u00fc\u015fe g\u00f6re ER’a ba\u011fl\u0131 ribozomlar h\u00fccre d\u0131\u015f\u0131na sal\u0131nan proteinleri yapar (pankreas\u0131n sindirim enzimlerinde oldu\u011fu gibi). Serbest ribozomlar da h\u00fccrenin kendi i\u00e7inde kullan\u0131lan proteinlerini sentezler <\/p>\n
Ribozomlar, rRNA ve proteinlerden yap\u0131lm\u0131\u015ft\u0131r. Proteinler, sitoplazmadan gelmedir. Buna kar\u015f\u0131n, rRNA kromozomun belirli yerlerinin kodlanmas\u0131yla olu\u015fur, \u00e7ekir*dek\u00e7ik i\u00e7erisinde depolan\u0131r ve daha sonra sitoplazmaya ge\u00e7er..<\/p>\n
Ayn\u0131 t\u00fcrdeki h\u00fccrelerde ribozomiar\u0131n protein ve amino asit bile\u015fimi ayn\u0131d\u0131r. De\u011fi\u015fik t\u00fcrlerde ve canl\u0131 gruplannda ise ribozomiar\u0131n yap\u0131l\u0131\u015f\u0131 birbirine \u00e7ok benzer. Hatta evrensel bir yap\u0131ya sahiptirler. Yani izole edilmi\u015f ribozomlar, h\u00fccre d\u0131\u015f\u0131nda, herhangi bir mRNA (al\u0131nd\u0131\u011f\u0131 canl\u0131n\u0131n t\u00fcr\u00fc ve grubu \u00f6nemli de\u011fildir), uygun amino asitler, gerekli enerji kayna\u011f\u0131, enzimler ve ta\u015f\u0131y\u0131c\u0131 RNA (tRNA) buldu\u011fu zaman, protein sentezleyebilir.<\/p>\n","protected":false},"excerpt":{"rendered":"
Vir\u00fcsler hari\u00e7 t\u00fcm canl\u0131larda bulunur. Yakla\u015f\u0131k 15 – 20 nm. (150 – 200 A\u00b0) \u00e7a-p\u0131nda, hepsi birbirinin benzeri, k\u00fcremsi ya da oval partik\u00fcllerdir. H\u00fccrelerin en k\u00fc\u00e7\u00fck organelidir. \u00f6z\u00fcnde taban k\u0131s\u0131mlar\u0131yla birbirine mRNA (messenger RNA) arac\u0131l\u0131\u011f\u0131yla yap\u0131\u015fm\u0131\u015f biri b\u00fcy\u00fck (molek\u00fcler a\u011f\u0131rl\u0131\u011f\u0131 yakla\u015f\u0131k 1.300.000 dalton) di\u011feri k\u00fc\u00e7\u00fck (molek\u00fcler a\u011f\u0131rl\u0131\u011f\u0131 yakla\u015f\u0131k 600.000 dalton) iki alt birimden meydana gelmi\u015ftir. …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1407,1403],"tags":[4855,5693,9279,2298,2303,9278,2534,2279],"class_list":["post-4140","post","type-post","status-publish","format-standard","hentry","category-fen-ve-teknoloji-odevleri","category-odevler","tag-amino-asitler","tag-escherichia-coli","tag-messenger-rna","tag-pankreas","tag-protein","tag-ribozomlar","tag-rrna","tag-virusler"],"_links":{"self":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts\/4140","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/comments?post=4140"}],"version-history":[{"count":0,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts\/4140\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/media?parent=4140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/categories?post=4140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/tags?post=4140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}