下列哪种多聚氨基酸（poly-aa）在生理条件下易形成α-螺旋（）。

A:poly-Val B:poly-Glu C:poly-Lys D:poly-Pro E:poly-Ala

split poly tool是什么工具？（）

A:合并工具 B:挤出工具 C:加线工具 D:分离工具

PS（poly styrene）是（）

A:聚乙烯 B:聚丙烯 C:聚丁烯 D:聚夯乙烯

真核生物的mRNA在其3'末端有poly(A)⁺结构，而对于poly(A)^-mRNA来说（）。

A:根本不存在 B:有poly(A)^-mRN C:有poly(A)-mRNA，似乎也能被翻译，但与poly(A)⁺m D:有poly(A)^-mRNA，也能被翻译，而且其动力学与poly(A)⁺

真核生物的mRNA在其3’末端有poly(A)⁺结构，而对于poly(A)^-mRNA来说( )。

A:根本不存在 B:偶有poly(A)^-mRNA，但不能被翻译 C:偶有poly(A)-mRNA，似乎也能被翻译，但与poly(A)⁺mRNA动力学不同 D:偶有poly(A)^-mRNA，也能被翻译，而且其动力学与poly(A)⁺mRNA基本相同

真核的mRNA在其3′端有poly（A）⁺结构，而对于poly（A）^-mRNA来说（）

A:根本不存在； B:偶有poly（A）^-mRNA，但不能被翻译； C:偶有poly（A）^-mRNA，似乎也能被翻译，但与poly（A）⁺mRNA动力学不同； D:偶有poly（A）^-mRNA，也能被翻译，而且其动力学与poly（A）⁺mRNA基本相同。

Xiao Shenyang will present a comedy in mid-May. You’ll enjoy erren zhuan, a local folk dance from Northeast China. Time: 8:00 p.m. May 10 Tickets: 280—800 yuan Venue: Shenzhen Sports Center Booking: 11185 Rubina Ali, the young actress who played Lakita in Slumdog Millionaire(《贫民窟的百万富翁》), is performing in a musical named "Sleeping Beauty". Time: 7:30 p.m. June 1 Tickets: 280 yuan Venue: Shenzhen Poly Center Booking : 86371698 Liu Qian, a well-known magician (魔术师) from Taiwan, is performing wonderful magic tricks. Time: 3:00 p.m. June 20 Tickets: 500 yuan (5% off if you buy online) Venue: Shenzhen Children’s Palace Booking: 89812344 Britain singing sensation Susan Boyle is coming! You may enjoy her angelic voice in her concert. Time: 8:00 p.m. July 25 Tickets: 380—700 yuan Venue: Shenzhen Grand Theater Booking: 82337625 If you want to go to a musical, you should go to （）.

A:Shenzhen Grand Theater B:Shenzhen Sports Center C:Shenzhen Poly Theater D:Shenzhen Children’s Palace

Xiao Shenyang will present a comedy in mid-May. You’ll enjoy erren zhuan, a local folk dance from Northeast China. Time: 8:00 p.m. May 10 Tickets: 280—800 yuan Venue: Shenzhen Sports Center Booking: 11185 Rubina Ali, the young actress who played Lakita in Slumdog Millionaire(《贫民窟的百万富翁》), is performing in a musical named "Sleeping Beauty". Time: 7:30 p.m. June 1 Tickets: 280 yuan Venue: Shenzhen Poly Center Booking : 86371698 Liu Qian, a well-known magician (魔术师) from Taiwan, is performing wonderful magic tricks. Time: 3:00 p.m. June 20 Tickets: 500 yuan (5% off if you buy online) Venue: Shenzhen Children’s Palace Booking: 89812344 Britain singing sensation Susan Boyle is coming! You may enjoy her angelic voice in her concert. Time: 8:00 p.m. July 25 Tickets: 380—700 yuan Venue: Shenzhen Grand Theater Booking: 82337625 If you want to go to a musical, you should go to （）.

A:Shenzhen Grand Theater B:Shenzhen Sports Center C:Shenzhen Poly Theater D:Shenzhen Children’s Palace

Xiao Shenyang will present a comedy in mid-May. You’ll enjoy erren zhuan, a local folk dance from Northeast China. Time: 8:00 p.m. May 10 Tickets: 280—800 yuan Venue: Shenzhen Sports Center Booking: 11185 Rubina Ali, the young actress who played Lakita in Slumdog Millionaire(《贫民窟的百万富翁》), is performing in a musical named "Sleeping Beauty". Time: 7:30 p.m. June 1 Tickets: 280 yuan Venue: Shenzhen Poly Center Booking : 86371698 Liu Qian, a well-known magician (魔术师) from Taiwan, is performing wonderful magic tricks. Time: 3:00 p.m. June 20 Tickets: 500 yuan (5% off if you buy online) Venue: Shenzhen Children’s Palace Booking: 89812344 Britain singing sensation Susan Boyle is coming! You may enjoy her angelic voice in her concert. Time: 8:00 p.m. July 25 Tickets: 380—700 yuan Venue: Shenzhen Grand Theater Booking: 82337625 If you want to go to a musical, you should go to （）.

A:Shenzhen Grand Theater B:Shenzhen Sports Center C:Shenzhen Poly Theater D:Shenzhen Children’s Palace