²é¿´: 2426  |  »Ø¸´: 3
¡¾ÐüÉͽð±Ò¡¿»Ø´ð±¾ÌûÎÊÌ⣬×÷Õßmengsk½«ÔùËÍÄú 8 ¸ö½ð±Ò

mengsk

½ð³æ (ÖøÃûдÊÖ)

[ÇóÖú] ÑÎÀë×ÓÈçºÎÓ°ÏìDNAºÍµ°°×ÖÊ

±¾ÈË·ÇÉúÎïרҵ£¬ÏëÇë½ÌÁ½¸öÎÊÌ⣺

1. ÇëÎÊNDAµÄA, B, ZÈýÖֽṹÊDz»ÊÇÊÜÑÎÀë×ӵĵ÷¿Ø£¿   

2. ÑζÔDNA»òÕßµ°°×ÖʵĹ¹ÏóºÍ¹¦ÄÜ£¬´óÖÂÓÐʲôӰÏ죬ÄÜ·ñ´óÖ·ÖÒ»ÏÂÀࣿ

×îºÃ¸øЩ×ÛÊöÎÄÏס£·Ç³£Ð»Ð»£¡
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍƼö£¬¶ÔÄúͬÑùÓаïÖú:

·Ü¶·ÖеÄСľ³æ
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

pennchem

ר¼Ò¹ËÎÊ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
mengsk: ½ð±Ò+2, ¡ï¡ï¡ïºÜÓаïÖú 2013-10-22 16:17:07
(1)ÊÇDNA£¬ÊÜÑÎÀë×ÓÓ°Ï죬ҲÊÜʪ¶ÈµÄÓ°Ïì

£¨2£©ÑÎÀë×Ó¿ÉÒÔÖк͵°°×ÖÊ»òÕßDNAµÄµçºÉ£¬Èõ°°×ÖʺÍDNA¸ü¼ÓÎȶ¨£¨»òÕß²»Îȶ¨£¬È¡¾öÓÚʲôÑΣ¬»¹ÓÐÑÎÀë×ÓµÄŨ¶È£©£¬³ý·Ç·¢Éú»¯Ñ§·´Ó¦¸Ä±ä¹²¼Û¼ü£¬¸öÈËÈÏΪÑÎÀë×Ó¶Ôµ°°×»òÕߺËËáµÄ¹¹ÏóÓ°ÏìûÓÐÄÇô´ó
ÐÐÖÁË®Çî´¦£¬×ø¿´ÔÆÆðʱ
2Â¥2013-10-22 09:24:53
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

pennchem

ר¼Ò¹ËÎÊ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

Form A :right handed double helix
Most RNA present in this form
Major conformation of RNA
the most favorable conformation at low concentration of water
Bases are displaced away from the axis
Major groove is narrow while minor groove is wide
Over all shape short and wide

Form B : Right handed double helix
the most common type of DNA
Major conformation of DNA
the most favorable conformation at high concentration of water
Bases are perpendicular to the axis
Major groove is wide while minor groove is narrow
Over all shape is long and narrow

Form z : Left handed double helix
Zigzag form
Minor conformation of DNA
the most favorable conformation at high concentration of salt
Bases are perpendicular to the axis
Both major and minor groove are narrow
Over all shape is elongate and narrow
ÐÐÖÁË®Çî´¦£¬×ø¿´ÔÆÆðʱ
3Â¥2013-10-22 09:30:00
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

mengsk

½ð³æ (ÖøÃûдÊÖ)

Ï£ÍûÄܹ»µÃµ½¸ü¶àרҵµÄ»Ø¸´£¬ºÍÎÄÏס£
·Ü¶·ÖеÄСľ³æ
4Â¥2013-10-22 16:28:28
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌøת ÎÒÒª¶©ÔÄÂ¥Ö÷ mengsk µÄÖ÷Ìâ¸üÐÂ
²»Ó¦Öú È·¶¨»ØÌûÓ¦Öú (×¢Ò⣺ӦÖú²Å¿ÉÄܱ»½±Àø£¬µ«²»ÔÊÐí¹àË®£¬±ØÐëÌîд15¸ö×Ö·ûÒÔÉÏ)
×î¾ßÈËÆøÈÈÌûÍƼö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼²©] ¶Á²©µÄÓûÍû´ïµ½ÁËáÛ·å +18 СÍè¾Å 2024-12-17 18/900 2024-12-24 00:10 by li380112795
[½Ìʦ֮¼Ò] Èç¹ûÆÀÖ°³Æ²»ÐèÒª¹ú¼Ò×ÔÈ»»ù½ð£¬»¹»áÓÐÈËÈ¥ÉêÇëÂ𣿠+4 akslis2024 2024-12-19 4/200 2024-12-23 23:14 by Ô¥½·
[ÕÒ¹¤×÷] »¯Ñ§²©Ê¿ +8 ʵÃûÐĶ¯¹úÃñÃÈÊ 2024-12-17 15/750 2024-12-23 21:21 by ʵÃûÐĶ¯¹úÃñÃÈÊ
[½Ìʦ֮¼Ò] ×ÉѯһÏ£¬ÊDz»ÊǽÌÊÚÖ®¼ä±È½Ï¼É»ä̸ÂÛÎÄÔì¼Ù£¬ÒòΪ¿ÉÄܺܶàÈ˶¼ÊÇÔì¼Ù +9 akslis2024 2024-12-21 10/500 2024-12-23 20:46 by zeolitess
[΢Ã׺ÍÄÉÃ×] ¡¾Ôõôȷ¶¨Ò»ÖÖÎïÖÊѽ¡¿xrd²â²»³ö·åµÄ²ÄÁÏ 50+3 СÅáÏëÉÏѧ 2024-12-21 6/300 2024-12-23 20:44 by zeolitess
[½Ìʦ֮¼Ò] ÓÐÁ½¸öÊ¡¼¶È˲Åñ×ÓÌø²ÛÕÒ¹¤×÷£¬ÄѶÈÔõôÑù +6 akslis2024 2024-12-23 6/300 2024-12-23 20:34 by ÕçÊ¿Òþ207
[¿¼²©] ÇóÀÏʦŶ£¡ +6 ¾°Ð¡¿­ 2024-12-20 6/300 2024-12-23 17:51 by ±ä³ÉСÉñ
[ÂÛÎÄͶ¸å] MDPIͶ¸åÁ¬Ðø¾Ü¸åÊÇʲôԭÒò£¿ÎÄÕÂÖÊÁ¿²»ºÃÂ𣿻¹ÊÇÆäËûÔ­Òò£¿ 2+9 ¶àÌý¶à¿´¶àѧ 2024-12-17 19/950 2024-12-23 17:12 by maolC
[½Ìʦ֮¼Ò] ΪɶºÜ¶à¸ßУÀÏʦ²»Ô¸Òâµ±¸±Ôº³¤£¿ +12 ÒâµÃ¼­_editage 2024-12-18 16/800 2024-12-23 11:29 by jurkat.1640
[ÕÒ¹¤×÷] Ë®µç½âÖÆÇâ·½ÏòÇóÖ° +6 kyle1999 2024-12-19 13/650 2024-12-23 10:02 by kyle1999
[˶²©¼ÒÔ°] ¶ÁÑÐÖ®ºó·¢ÏÖ: Ȧ×Ó±äµÃÔ½À´Ô½Ð¡ÁË... +13 ¶¡¿ÂÏèѼ 2024-12-19 18/900 2024-12-22 23:06 by ¶¡¿ÂÏèѼ
[¿¼²©] 2025É격ÇóÖú +7 125814 2024-12-22 7/350 2024-12-22 17:07 by ±ÏÉúËùѧ
[˶²©¼ÒÔ°] Ö¬ÖÊÑõ»¯ +3 song794 2024-12-22 4/200 2024-12-22 14:12 by song794
[˶²©¼ÒÔ°] ²©Ò» +10 ÓÄƤƤƤ 2024-12-17 16/800 2024-12-22 07:37 by Ermito
[˶²©¼ÒÔ°] ÕÐƸ²©Ê¿ +7 ´ó·¢²ÆÊ÷ 2024-12-18 8/400 2024-12-21 16:17 by yanjiaming
[½Ìʦ֮¼Ò] ½ñÄêµÄ¿ÆÑм¨Ð§Ö»½±ÀøQ1ÁË +12 holypower 2024-12-20 17/850 2024-12-21 16:13 by willbuilder
[½Ìʦ֮¼Ò] ѧУÅÅÃû¿¿Ç°·¢Õ¹ºÃ£¬×î´óµÄÊÜÒæÕßÊÇУÁìµ¼»¹ÊÇÆÕͨÀÏʦ£¿ +6 akslis2024 2024-12-17 7/350 2024-12-21 11:22 by Á賿һµã393
[ÂÛÎÄͶ¸å] Ͷ¸åͶ´íÆÚ¿¯£¬Ôõô³·¸å£¿ 200+4 birrd 2024-12-17 8/400 2024-12-20 14:53 by yiran909
[ÂÛÎÄͶ¸å] ÂÛÎÄͶ¸å +4 @Ðdz¾@ 2024-12-17 6/300 2024-12-19 09:39 by YXLSYJK
[ÂÛÎÄͶ¸å] ±ÏÒµÂÛÎÄÒÉÂÇ 20+6 ·ç´µºÉҶɷ 2024-12-17 17/850 2024-12-18 17:35 by holypower
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û