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{"id":22879,"date":"2018-03-20T16:37:58","date_gmt":"2018-03-20T09:37:58","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=22879"},"modified":"2018-03-20T16:38:56","modified_gmt":"2018-03-20T09:38:56","slug":"phan-nam-chuong-1-bai-2-phien-ma-va-dich-ma","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/phan-nam-chuong-1-bai-2-phien-ma-va-dich-ma\/","title":{"rendered":"Ph\u1ea7n N\u0103m – Ch\u01b0\u01a1ng 1 – B\u00e0i 2: Phi\u00ean m\u00e3 v\u00e0 d\u1ecbch m\u00e3"},"content":{"rendered":"

B\u00e0i 1 (trang 14 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y tr\u00ecnh b\u00e0y di\u1ec5n bi\u1ebfn v\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh phi\u00ean m\u00e3.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

– Qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p ARN tr\u00ean m\u1ea1ch khu\u00f4n ADN \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 qu\u00e1 tr\u00ecnh phi\u00ean m\u00e3. Tuy gen c\u00f3 c\u1ea5u t\u1ea1o 2 m\u1ea1ch nucleotit nh\u01b0ng trong m\u1ed7i gen ch\u1ec9 c\u00f3 m\u1ed9t m\u1ea1ch \u0111\u01b0\u1ee3c l\u00e0m khu\u00f4n (m\u1ea1ch m\u00e3 g\u1ed1c) \u0111\u1ec3 t\u1ed5ng h\u1ee3p ARN. Tr\u01b0\u1edbc h\u1ebft enzim ARN polimeraza b\u00e1m v\u00e0o v\u00f9ng kh\u1edfi \u0111\u1ea7u l\u00e0m gen th\u00e1o xo\u1eafn \u0111\u1ec3 l\u1ed9 ra m\u1ea1ch m\u00e3 g\u1ed1c c\u00f3 chi\u1ec1u 3’\u2192 5′ v\u00e0 b\u1eaft \u0111\u1ea7u t\u1ed5ng h\u1ee3p mARN t\u1ea1i v\u1ecb tr\u00ed \u0111\u1eb7c hi\u1ec7u (kh\u1edfi \u0111\u1ea7u phi\u00ean m\u00e3).<\/p>\n

– Sau \u0111\u00f3, ARN polimeraza tr\u01b0\u1ee3t d\u1ecdc theo m\u1ea1ch m\u00e3 g\u1ed1c gen \u0111\u1ec3 t\u1ed5ng h\u1ee3p n\u00ean ph\u00e2n t\u1eed mARN theo nguy\u00ean t\u1eafc b\u1ed5 sung (A v\u1edbi U, T v\u1edbi A, G v\u1edbi X v\u00e0 X v\u1edbi G) theo chi\u1ec1u 5‘<\/sup>\u00a0\u2192 3‘<\/sup>. Khi enzim di chuy\u1ec3n t\u1edbi cu\u1ed1i gen g\u1eb7p t\u00edn hi\u1ec7u k\u1ebft th\u00fac th\u00ec n\u00f3 d\u1eebng phi\u00ean m\u00e3 v\u00e0 ph\u00e2n t\u1eed mARN v\u1eeba t\u1ed5ng h\u1ee3p \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng. V\u00f9ng n\u00e0o tr\u00ean gen v\u1eeba phi\u00ean m\u00e3 xong th\u00ec 2 m\u1ea1ch \u0111\u01a1n \u0111\u00f3ng xo\u1eafn ngay l\u1ea1i.<\/p>\n

– \u1ede t\u1ebf b\u00e0o nh\u00e2n s\u01a1, mARN sau phi\u00ean m\u00e3 \u0111\u01b0\u1ee3c tr\u1ef1c ti\u1ebfp d\u00f9ng l\u00e0m khu\u00f4n \u0111\u1ec3 t\u1ed5ng h\u1ee3p protein. C\u00f2n \u1edf t\u1ebf b\u00e0o nh\u00e2n th\u1ef1c, mARN sau phi\u00ean m\u00e3 ph\u1ea3i \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i, c\u1eaft b\u1ecf c\u00e1c intron, n\u1ed1i c\u00e1c \u00eax\u00f4n l\u1ea1i v\u1edbi nhau r\u1ed3i qua m\u00e0ng nh\u00e2n ra t\u1ebf b\u00e0o ch\u1ea5t l\u00e0m khu\u00f4n t\u1ed5ng h\u1ee3p protein.<\/p>\n

K\u1ebft qu\u1ea3: th\u00f4ng tin di truy\u1ec1n tr\u00ean m\u1ea1ch m\u00e3 g\u1ed1c c\u1ee7a gen \u0111\u01b0\u1ee3c phi\u00ean m\u00e3 th\u00e0nh ph\u00e2n t\u1eed mARN theo nguy\u00ean t\u1eafc b\u1ed5 sung.<\/p>\n

B\u00e0i 2 (trang 14 SGK Sinh h\u1ecdc 12):\u00a0Qu\u00e1 tr\u00ecnh d\u1ecbch m\u00e3 t\u1ea1i rib\u00f4x\u00f4m di\u1ec5n ra nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

D\u1ecbch m\u00e3 l\u00e0 qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p protein. Qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra nh\u01b0 sau: g\u1ed3m hai giai \u0111o\u1ea1n:<\/p>\n

* Ho\u1ea1t h\u00f3a axit amin<\/p>\n

Trong t\u1ebf b\u00e0o ch\u1ea5t, nh\u1edd c\u00e1c enzim \u0111\u1eb7c hi\u1ec7u v\u00e0 n\u0103ng l\u01b0\u1ee3ng ATP, c\u00e1c axit amin \u0111\u01b0\u1ee3c ho\u1ea1t h\u00f3a v\u00e0 g\u1eafn v\u1edbi tARN t\u01b0\u01a1ng \u1ee9ng t\u1ea1o n\u00ean ph\u1ee9c h\u1ee3p axit amin \u2013 tARN (aa \u2013 tARN).<\/p>\n

* T\u1ed5ng h\u1ee3p chu\u1ed7i polipeptit:<\/p>\n

– M\u1edf \u0111\u1ea7u:<\/p>\n

Ti\u1ec3u \u0111\u01a1n v\u1ecb b\u00e9 c\u1ee7a riboxom g\u1eafn v\u1edbi mARN \u1edf v\u1ecb tr\u00ed nh\u1eadn bi\u1ebft \u0111\u1eb7c hi\u1ec7u. V\u1ecb tr\u00ed n\u00e0y n\u1eb1m g\u1ea7n c\u00f4\u0111on m\u1edf \u0111\u1ea7u. B\u1ed9 ba \u0111\u1ed1i m\u00e3 c\u1ee7a ph\u1ee9c h\u1ee3p m\u1edf \u0111\u1ea7u Met \u2013 tARN (UAX) b\u1ed5 sung ch\u00ednh x\u00e1c v\u1edbi c\u00f4\u0111on m\u1edf \u0111\u1ea7u (AUG) tr\u00ean mARN. Ti\u1ec3u \u0111\u01a1n v\u1ecb l\u1edbn c\u1ee7a riboxom k\u1ebft h\u1ee3p t\u1ea1o riboxom ho\u00e0n ch\u1ec9nh s\u1eb5n s\u00e0ng t\u1ed5ng h\u1ee3p chu\u1ed7i polipeptit.<\/p>\n

– K\u00e9o d\u00e0i chu\u1ed7i polipeptit:<\/p>\n

C\u00f4\u0111on th\u1ee9 hai tr\u00ean mARN (GAA) g\u1eafn b\u1ed5 sung v\u1edbi antic\u00f4\u0111on c\u1ee7a ph\u1ee9c h\u1ee3p Glu \u2013 tARN (XUU). Riboxom gi\u1eef vai tr\u00f2 nh\u01b0 m\u1ed9t khung \u0111\u1ee1 mARN v\u00e0 ph\u1ee9c h\u1ee3p aa \u2013 tARN v\u1edbi nhau, \u0111\u1ebfn khi hai axit amin Met v\u00e0 Glu t\u1ea1o n\u00ean li\u00ean k\u1ebft peptit gi\u1eefa ch\u00fang. Riboxom d\u1ecbch \u0111i m\u1ed9t c\u00f4\u0111on tr\u00ean mARN \u0111\u1ec3 \u0111\u1ee1 ph\u1ee9c h\u1ee3p c\u00f4\u0111on \u2013 antic\u00f4\u0111on ti\u1ebfp theo cho \u0111\u1ebfn khi axit amin th\u1ee9 ba (Arg) g\u1eafn v\u1edbi axit amin th\u1ee9 hai (Glu) b\u1eb1ng li\u00ean k\u1ebft peptit. Riboxom l\u1ea1i d\u1ecbch chuy\u1ec3n \u0111i m\u1ed9t c\u00f4\u0111on tr\u00ean mARN v\u00e0 c\u1ee9 ti\u1ebfp t\u1ee5c nh\u01b0 v\u1eady \u0111\u1ebfn cu\u1ed1i mARN.<\/p>\n

– K\u1ebft th\u00fac:<\/p>\n

Khi riboxom ti\u1ebfp x\u00fac v\u1edbi m\u00e3 k\u1ebft th\u00fac tr\u00ean mARN (UAG) th\u00ec qu\u00e1 tr\u00ecnh d\u1ecbch m\u00e3 ho\u00e0n t\u1ea5t.<\/p>\n

Nh\u1edd m\u1ed9t lo\u1ea1i enzim \u0111\u1eb7c hi\u1ec7u, axit amin m\u1edf \u0111\u1ea7u (Met) \u0111\u01b0\u1ee3c c\u1eaft kh\u1ecfi chu\u1ed7i poilipeptit v\u1eeba t\u1ed5ng h\u1ee3p. Chu\u1ed7i polipeptit ti\u1ebfp t\u1ee5c h\u00ecnh th\u00e0nh c\u00e1c c\u1ea5u tr\u00fac b\u1eadc cao h\u01a1n, tr\u1edf th\u00e0nh protein c\u00f3 ho\u1ea1t t\u00ednh sinh h\u1ecdc.<\/p>\n

B\u00e0i 3 (trang 14 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau vai tr\u00f2 c\u1ee7a poliriboxom trong qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p protein.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Vai tr\u00f2 c\u1ee7a poliriboxom trong qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p protein:<\/p>\n

– Trong qu\u00e1 tr\u00ecnh d\u1ecbch m\u00e3 mARN th\u01b0\u1eddng kh\u00f4ng g\u1eafn v\u1edbi t\u1eebng riboxom ri\u00eang r\u1ebd m\u00e0 \u0111\u1ed3ng th\u1eddi g\u1eafn v\u1edbi m\u1ed9t nh\u00f3m riboxom g\u1ecdi l\u00e0 poliriboxom (g\u1ecdi t\u1eaft l\u00e0 polixom) gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t t\u1ed5ng h\u1ee3p protein.<\/p>\n

– Sau khi riboxom th\u1ee9 nh\u1ea5t d\u1ecbch chuy\u1ec3n \u0111\u01b0\u1ee3c 1 \u0111o\u1ea1n th\u00ec riboxom th\u1ee9 2 li\u00ean k\u1ebft v\u00e0o mARN theo \u0111\u00f3 l\u00e0 riboxom th\u1ee9 3, 4 …. Nh\u01b0 v\u1eady, m\u1ed7i 1 ph\u00e2n t\u1eed mARN c\u00f3 th\u1ec3 t\u1ed5ng h\u1ee3p t\u1eeb 1 \u0111\u1ebfn nhi\u1ec1u chu\u1ed7i polipeptit c\u00f9ng lo\u1ea1i r\u1ed3i t\u1ef1 h\u1ee7y. C\u00e1c riboxom \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng qua v\u00e0i th\u1ebf h\u1ec7 t\u1ebf b\u00e0o v\u00e0 c\u00f3 th\u1ec3 tham gia v\u00e0o t\u1ed5ng h\u1ee3p b\u1ea5t c\u1ee9 lo\u1ea1i protein n\u00e0o.<\/p>\n

B\u00e0i 4 (trang 14 SGK Sinh h\u1ecdc 12):\u00a0M\u1ed9t \u0111o\u1ea1n gen c\u00f3 tr\u00ecnh t\u1ef1 c\u00e1c nucleotit nh\u01b0 sau:<\/strong><\/p>\n

3‘<\/sup>\u00a0XGA \u00a0GAA\u00a0 TTT \u00a0XGA 5‘<\/sup>\u00a0(m\u1ea1ch m\u00e3 g\u1ed1c)<\/strong><\/p>\n

5‘<\/sup>\u00a0GXT \u00a0XTT\u00a0 AAA \u00a0GXT 3‘<\/sup><\/strong><\/p>\n

a) H\u00e3y x\u00e1c \u0111\u1ecbnh tr\u00ecnh t\u1ef1 c\u00e1c axit amin trong chu\u1ed7i polipeptit \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p t\u1eeb \u0111o\u1ea1n gen tr\u00ean.<\/strong><\/p>\n

b) M\u1ed9t \u0111o\u1ea1n ph\u00e2n t\u1eed protein c\u00f3 tr\u00ecnh t\u1ef1 axit amin nh\u01b0 sau:<\/strong><\/p>\n

\u2013 l\u01a1xin \u2013 alanin \u2013 valin \u2013 lizin \u2013<\/strong><\/p>\n

H\u00e3y x\u00e1c \u0111\u1ecbnh tr\u00ecnh t\u1ef1 c\u00e1c c\u1eb7p nucleotit trong \u0111o\u1ea1n gen mang th\u00f4ng tin quy \u0111\u1ecbnh c\u1ea5u tr\u00fac \u0111o\u1ea1n protein \u0111\u00f3.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

5‘<\/sup>\u00a0GXT \u00a0 \u00a0 XTT \u00a0 \u00a0 AAA \u00a0 \u00a0 GXT 3‘<\/sup><\/p>\n

3‘<\/sup>\u00a0XGA \u00a0 \u00a0 GAA \u00a0 \u00a0 TTT \u00a0 \u00a0 XGA 5‘<\/sup>\u00a0(m\u1ea1ch m\u00e3 g\u1ed1c)<\/p>\n

5‘<\/sup>\u00a0GXU \u00a0 \u00a0 XUU \u00a0 \u00a0 AAA \u00a0 \u00a0 GXU 3‘<\/sup>\u00a0(mARN)<\/p>\n

Ala \u00a0 \u00a0 \u00a0 \u00a0 Leu \u00a0 \u00a0 \u00a0 \u00a0 Lys Ala (tr\u00ecnh t\u1ef1 axit amin)<\/p>\n

b)Leu \u2013 Ala \u2013 Val \u2013 Lys (tr\u00ecnh t\u1ef1 axit amin)<\/p>\n

UUA \u00a0 \u00a0 \u00a0 GXU \u00a0 \u00a0 \u00a0 GUU \u00a0 \u00a0 \u00a0 AAA (mARN) (c\u00f3 th\u1ec3 l\u1ea5y v\u00ed d\u1ee5 kh\u00e1c, do nhi\u1ec1u b\u1ed9 ba c\u00f9ng m\u00e3 h\u00f3a 1 lo\u1ea1i axit amin).<\/p>\n

ADN: 3′ AAT\u00a0XGA\u00a0XAA\u00a0TTT 5′ (m\u1ea1ch m\u00e3 g\u1ed1c)<\/p>\n

5′ TTA\u00a0 GXT\u00a0 GTT\u00a0AAA 3′<\/p>\n

B\u00e0i 5 (trang 14 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y ch\u1ecdn ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi \u0111\u00fang nh\u1ea5t.<\/strong><\/p>\n

C\u00e1c protein \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p trong t\u1ebf b\u00e0o nh\u00e2n th\u1ef1c \u0111\u1ec1u.<\/strong><\/p>\n

a) B\u1eaft \u0111\u1ea7u b\u1eb1ng axit amin Met.<\/strong><\/p>\n

\u00a0 \u00a0b) B\u1eaft \u0111\u1ea7u b\u1eb1ng axit amin foocmin \u2013 m\u00eati\u00f4nin.<\/strong><\/p>\n

\u00a0 \u00a0c) C\u00f3 Met \u1edf v\u1ecb tr\u00ed \u0111\u1ea7u ti\u00ean b\u1ecb c\u1eaft b\u1edfi enzim.<\/strong><\/p>\n

\u00a0 \u00a0d) C\u1ea3 a v\u00e0 c.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\u0110\u00e1p \u00e1n : d.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 1 (trang 14 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y tr\u00ecnh b\u00e0y di\u1ec5n bi\u1ebfn v\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh phi\u00ean m\u00e3. L\u1eddi gi\u1ea3i: – Qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p ARN tr\u00ean m\u1ea1ch khu\u00f4n ADN \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 qu\u00e1 tr\u00ecnh phi\u00ean m\u00e3. Tuy gen c\u00f3 c\u1ea5u t\u1ea1o 2 m\u1ea1ch nucleotit nh\u01b0ng trong m\u1ed7i gen ch\u1ec9 c\u00f3 m\u1ed9t m\u1ea1ch […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1307],"tags":[1397,1398],"yoast_head":"\nPh\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 1 - B\u00e0i 2: Phi\u00ean m\u00e3 v\u00e0 d\u1ecbch m\u00e3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/phan-nam-chuong-1-bai-2-phien-ma-va-dich-ma\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 1 - B\u00e0i 2: Phi\u00ean m\u00e3 v\u00e0 d\u1ecbch m\u00e3\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 14 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y tr\u00ecnh b\u00e0y di\u1ec5n bi\u1ebfn v\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh phi\u00ean m\u00e3. L\u1eddi gi\u1ea3i: – Qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p ARN tr\u00ean m\u1ea1ch khu\u00f4n ADN \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 qu\u00e1 tr\u00ecnh phi\u00ean m\u00e3. 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