【单选题】某双链 DNA 分子中含有 200 个碱基,一条链上 A ∶ T ∶ G ∶ C = 1 ∶ 2 ∶ 3 ∶ 4 ,则该 DNA 分子( )
A.
四种含氮碱基 A ∶ T ∶ G ∶ C = 4 ∶ 4 ∶ 7 ∶ 7
B.
若该 DNA 中 A 为 p 个,占全部碱基的 m n ( m >2 n ),则 G 的个数为 2n pm - p
【单选题】某双链DNA分子含有200个碱基,一条链上A:T:G://C=1:2:3:4,则该DNA分子()
C.
四种含氮碱基A:T:G://C=3:3:7:7
【简答题】为了实现对文件目录的管理,通常将文件目录以文件的形式存放在外存,这个文件称为( )。
【单选题】某双链DNA分子含有200个碱基,一条链上A∶T∶G∶C=1∶2∶3∶4,则该DNA分子()
B.
连续复制两次,需要游离的腺嘌呤脱氧核苷酸210个
【单选题】某双链DNA有200个碱基,一条链上A:T:G:C=1:2:3:4,则该DNA分子( )
B.
连续复制 2 次,需要游离的腺嘌呤脱氧核苷酸 210 个
C.
4 种碱基 A:T:G:C = 3 : 3 : 7 : 7
【单选题】某双链 DNA 有 200 个碱基,一条链上 A:T:G:C = 1 : 2 : 3 : 4 ,则该 DNA 分子
B.
连续复制 2 次,需要游离的腺嘌呤脱氧核苷酸 210 个 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
C.
4 种碱基 A:T:G:C = 3 : 3 : 7 : 7
【单选题】The amount of fuel injected into a diesel engine cylinder by a unit injector is controlled by_______.
A.
the firing pressure in the cylinder
B.
a metering helix inside the pump
C.
varying the physical length of the plunger stroke
D.
varying the clearance between the injector cam and the injector rocker arm
【单选题】A typical fuel injector consists of two basic parts, the nozzle and the nozzle holder. 02010263
A.
One basic part of a typical injector is the filter.
B.
One basic part of a typical injector is the nut.
C.
One basic part of a typical injector is the nozzle nuts.
D.
One basic part of a typical injector is the nozzle.