dieu hoa hoat dong cua gen sinh hoc 12

... giáo khoa. - Nâng cao nhận thức đúng đắn và khoa học về điều hoà hoạt động cua gen thành phần cấu trúc hay chức năng của tế bào. Gen điều hòa tạo ra sản phẩm kiểm soát hoạt động cảu các gen ... hòa hoạt động gen ? - Trong tế bào có những loại gen nào ? Vai trò của gen cấu trúc, gen điều hòa ? (gen cấu trúc mang thông tin mã hóa cho các sản phẩm tạo nên cho các gen hoạt động ... sinh và cho con bú. I. Khái niệm Điều hòa hoạt động của gen là điều khiển gen có được phiên mã và dịch mã hay không, bảo đảm + Biến đổi sau dịch mã. - Có các gen gây tăng cường, gen...

... của gen ở sinh vật nhân sơ: Cơ chế điều hòa hoạt động của gen được Jacop và Mono phát hiện ở vi khuẩn E.coli vào năm 1961. 1. Mô hình điều hòa của operon Lac: Operon lac bao gồm: - Nhóm gen ... – Protein ? - Trong tế bào thì lúc nào gen tạo ra sản phẩm? (lúc cơ thể cần sản phẩm của gen) * Đặt vấn đề: làm thế nào để tế bào có thể điều khiển cho gen hoạt động đúng vào thời điểm cần thiết? ... điều hòa hoạt động của gen mà bài hôm nay chúng ta sẽ tìm hiểu) 3. Bài mới: Nội dung Hoạt động của GV và HS I. Khái quát về điều hòa hoạt động gen: Điếu hòa hoạt động của gen chính là điều hòa...

... cản quá trình phiên mà của Operon Cơ chế điều hoà Sinh tổng hợp prôtêin ADN Gen (R) Gen (R) Gen P Gen O Gen P Gen O Nhãm gen c u trúc Nhóm gen c u trúc Z Z Y Y A A OPERễN OPERễN Các phần tử Các ... điều hoà Sinh tổng hợp prôtêin ADN Gen I Gen I Nhãm gen cÊu Nhóm gen cấu trúc trúc Z Z Y Y A A operon operon Các phần tử Các phần tử ức chế ức chế mARN Gen P Gen O I. ... bộ gen của cơ thể: + Gen c u trúc (Z, Y, A) mỗi gen chuyên biệt cho trình tự axit amin của một loại enzim + Gen khởi động (P:promoter) l m nhi m vô kh i ng à ệ ở độ gen c u trúc. + Gen...

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...

... lượng sản phẩm - Điều hoà hoạt động gen là điều hoà lượng sản phẩm của gen. của gen. - Vd: người có khoảng 25000 gen, chỉ có 1 số gen hoạt đông, phần lớn gen ở trạng thái không hoạt động→ tổng ... vùng khởi động (P), nhóm gen cấu trúc (Z, Y, A). C. vùng khởi động (P), vùng vận hành (O), nhóm gen cấu trúc (Z, Y, A). D. gen điều hòa (R), vùng vận hành, nhóm gen cấu trúc (Z, Y, A). ... động Liên kết mARN của gen Z,Y,A Phiên mã Enzim phân giải đường lactozo Câu 1. Thành phần của opêrôn Lac ở E.coli gồm A. gen điều hòa (R), nhóm gen cấu trúc (Z, Y, A). B. gen điều hòa (R), vùng...

... Ở sinh vật nhân thực bên cạnh vùng khởi động và kết thúc phiên mã còn có các gen tăng cường và gen gây bất hoạt . - Gen tăng cường tác động lên gen điều hoà tăng cường phiên mã, gen bất ... Trong cơ chế điều hoà hoạt động gen ở sinh 5- Trong cơ chế điều hoà hoạt động gen ở sinh vật nhân sơ vai trò của gen điều hoà là gì : vật nhân sơ vai trò của gen điều hoà là gì : A- Nơi tiếp ... mới ( Bài 4 : ĐỘT BIẾN GEN ) mới ( Bài 4 : ĐỘT BIẾN GEN ) III- CƠ CHẾ ĐIỀU HOÀ HOẠT ĐỘNG CỦA GEN Ở III- CƠ CHẾ ĐIỀU HOÀ HOẠT ĐỘNG CỦA GEN Ở SINH VẬT NHÂN THỰC SINH VẬT NHÂN THỰC Tại sao...

... A). B. gen điều hòa (R), vùng khởi động (P), nhóm gen cấu trúc (Z, Y, A). C. vùng khởi động (P), vùng vận hành (O), nhóm gen cấu trúc (Z, Y, A). D. gen điều hòa (R), vùng vận hành, nhóm gen cấutrúc (Z, ... hoạt động của gen l gì? - - Đ Đ iều iều ho ho ho ho ạ ạ t t đ đ ộ ộ ng ng c c a a gen gen l l đ đ iều iều ho ho l l ợ ợ ng ng s s ả ả n n ph ph ẩ ẩ m m c c ủ ủ a a gen. gen. Các thành ... nhóm gen có liên quan về chứcnăng và có chung mộtcơ chếđiều hoà. Opêron là gì? Vùng vận hành ZYA Gen điềuhoà O P R Vùng khởi động ADN Opêron Các gen cấutrúc(Z, Y, A) có liên quan về chứcnăng P Gen...

... không có cơ chất (lactozơ), gen không hoạt động… Môi trường có cơ chất (lactozơ), làm biến tính protein ức chế… Vùng O của Operon được giải phóng, gen hoạt động … Câu 4. Gen điều hòa (R) mang thông...

... điều hoà phiên mà ở Procaryote Cơ chế điều hoà Sinh tổng hợp prôtêin ADN Gen (R) Gen (R) Gen P Gen O Gen P Gen O Nhãm gen c u trúc Nhóm gen c u trúc Z Z Y Y A A OPERễN OPERễN Các phần tử Các ... Gen c u trúc (Z, Y, A) mỗi gen chuyên biệt cho trình tự axit amin của một loại enzim + Gen khởi động (P:promoter) l m nhi m vô kh i ng à ệ ở độ gen c u trúc. + Gen Chỉ huy (O: Operator) ... chế điều hoà Sinh tổng hợp prôtêin II. Một số các cơ chế điều hoà khác: Cơ chế điều hoà Sinh tổng hợp prôtêin ã ADN trong mỗi tế bào ở Prôkaryote đủ bộ gen của cơ thể: + Gen c u trúc ...

... (P), nhóm gen cấu trúc . B. gen điều hoà, nhóm gen cấu trúc, vùng vận hành (O). C. gen điều hoà, nhóm gen cấu trúc, vùng vận hành (O), vùng khởi động (P). D. gen điều hoà, nhóm gen cấu trúc, ... có liên quan với các gen có hoạt tính cao và siêu nhạy cảm có liên quan đến các gen có hoạt tính rất cao (như các gen histon). 5 4. Mức dịch mã Sự điều hòa biểu hiện gen trong giai đoạn ... thuyết : Điều hoà hoạt động gen là điều hoà lượng sản phẩm của gen, nhằm đảm bảo hoạt động sống của sinh vật phù hợp với nhu cầu của nó và với môi trường. Vậy ở đây gen mã hóa 1 loại mARN được...

... modified chemically Sample Pathway for Control of Tryptophan (trp) Expression Gene 1 Gene 2 Gene 3 Gene 4 Gene 5 transcription translation Enzyme 1 Enzyme 2 Enzyme 3 Enzyme 4 Enzyme 5 Each ... Gene (always “on”) promotor rp. RNA Pol. binding site o. Operator r. rp. o. Gene 1 5 Genes needed for tryptophan production mRNA transcription unit Enz 1 Enz 2 Enz 3 Enz 4 Enz 5 Gene 1Gene ... Vocabulary Operator: - “on-off” switch to genes - controls the access of RNA polymerase to genes - found within the promotor region or between the promoter and gene-encoding regions Let’s take a...

... biệt trong điều hòa biểu hiện gene 5. Điều hòa biểu hiện gene qua “cắt nối” luân phiên (alternative splicing) có ý nghóa gì đối với sinh vật ? 6. Điều hòa biểu hiện gene qua “cắt nối” luân phiên ... Sự điều hòa biểu hiện gene ở pro- và eukaryote khác nhau như thế nào ? Tại sao ? 2. eukaryote có bao nhiêu kiểu điều hòa biểu hiện gene chính ? 3. Kiểu điều hòa biểu hiện gene quan trọng nhất ... ĐIỀU HÒA BIỂU HIỆN GENE TỪ XA Ở EUKARYOTE ĐIỀU HÒA Ở MỨC ĐỘ NHIỄM SẮC CHẤT VÀ CẤU TRÚC BỘ GENE Mức độ nén của nhiễm sắc chất là một yếu tố quyết định sự biểu hiện của gene. Mức độ nén này...

... biểu hiện gene ở prokaryote khác với ở eukaryote ? 18 SỰ TẠO BÀO TỬ Ở BACILLUS SUBTILLIS A  gene giữ nhà E  gene tạo bào tử tế bào mẹ sớm F  gene tạo bào tử, bào tử sớm G  gene tạo bào ... enzyme-gp33/gp34 sẽ phiên mã các gene muộn của phage 3 ĐIỀU HÒA DƯƠNG VÀ ÂM 21 CÂU HỎI 1. Điều hòa biểu hiện gene ở prokaryote dùng để làm gì ? 2. Có bao nhiêu kiểu điều hòa biểu hiện gene chính ở prokaryote ... tố sigma () do gene 28 của phage mã hóa sẽ thay thế nhân tố sigma của vi khuẩn  Giai đọan trung gian : Phức hợp enzyme-gp28 sẽ phiên mã các gene trung gian của phage Các gene trung gian...

... HOẠT ĐỘNG CỦA GEN Ở SINH VẬT NHÂN SƠ *Mỗi gen có vùng mã hóa và các vùng điều hòa Câu 1. Thành phần của opêrôn Lac ở E.coli gồm A. gen điều hòa (R), nhóm gen cấu trúc (Z, Y, A). B. gen điều hòa ... lượng sản phẩm - Điều hoà hoạt động gen là điều hoà lượng sản phẩm của gen. của gen. - Vd: người có khoảng 25000 gen, chỉ có 1 số gen hoạt đông, phần lớn gen ở trạng thái không hoạt động→ tổng ... vùng khởi động (P), nhóm gen cấu trúc (Z, Y, A). C. vùng khởi động (P), vùng vận hành (O), nhóm gen cấu trúc (Z, Y, A). D. gen điều hòa (R), vùng vận hành, nhóm gen cấu trúc (Z, Y, A). ...