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【简答题】
如图 3.5 所示,一根绳子系着一质量为 m 的小球,悬挂在天花板上,小球在水平面内作匀速圆周运动,有人在铅直合力写出 T cos q - mg = 0 (1) 也有人在沿绳子拉力合力写出 T - mg cos q = 0 (2) 显然两式互相矛盾,你认为哪式正确?答 . 理由是 .
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【单选题】内墙抹灰面积，应扣除门窗洞口和空圈所占的面积，不扣除踢脚、挂镜线、（）m2以内的孔洞和墙与构件交接处的面积，洞口侧壁和顶面亦不增加，墙垛和附墙烟囱侧壁面积与内墙抹灰工程量合并计算。
A.
0.3
B.
0.5
C.
0.1
D.
0.2
【单选题】By fusing the gene encoding a protein under study with the gene for an epitope tag, investigators can precipitate the protein product of the fusion gene by complexing it with the antibody that binds t...
A.
precipitation
B.
immunoprecipitation
C.
protein precipitation
D.
antigen precipitation
【单选题】If fusion to green fluorescence protein (GFP) does not impair the function or properties of a protein one wishes to study, the fusion protein can be used to reveal the protein’s ________ in the cell u...
A.
structure
B.
folding
C.
location
D.
partners
【单选题】The gene for almost any protein can be altered to express a fusion protein that can be purified by affinity chromatography. The peptide or protein used for this purpose is referred to as a tag. Which ...
A.
The gene encoding the target protein is fused to a gene encoding a peptide or protein that binds a large, unstable ligand with high affinity and specificity.
B.
Tag sequences can be added to genes such that the resulting proteins have tags at their amino or carboxyl terminus.
C.
Even very small tags can affect the properties of the proteins they are attached to, thereby influencing the study results.
D.
Even if the tag is removed by a protease, one or a few extra amino acid residues can remain behind on the target protein, which may or may not affect the protein’s activity.
【多选题】计算内墙面抹灰工程量时,( )的面积与内墙面合并计算。
A.
门洞口侧壁和顶面
B.
窗洞口侧壁、顶、底面
C.
墙垛侧壁面积
D.
附墙烟囱侧壁面积
E.
单个面积 0.3m 2 以上孔洞
【简答题】A fusion protein can easily be isolated by ____________________ chromatography.
【单选题】内墙抹灰面积,应扣除门窗洞口和空圈所占的面积,不扣除踢脚板、挂镜线、()以内的孔洞和墙与构件交接处的面积,洞口侧壁和顶面亦不增加,墙垛和附墙烟囱侧壁面积与内墙抹灰工程量合并计算。
A.
0.3m2；
B.
0.5m2；
C.
0.1m2；
D.
0.2m2
相关题目：
【多选题】计算内墙面抹灰工程量时,( )的面积与内墙面合并计算。
A.
门洞口侧壁和顶面
B.
窗洞口侧壁、顶、底面
C.
墙垛侧壁面积
D.
附墙烟囱侧壁面积
E.
单个面积 0.3m 2 以上孔洞