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【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 of the following statements about protein tags is wrong?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.
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举一反三
【单选题】如表是被测试者某血管、肾小囊腔和输尿管内P和Q两种物质的浓度．试分析P和Q各是什么物质（ ） 血管 肾小囊腔 输尿管 P 0.03% 0.03% 2% Q 0.1% 0.1% 0
A.
P是葡萄糖，Q是无机盐
B.
P是氨基酸，Q是葡萄糖
C.
P是尿素，Q是无机盐
D.
P是尿素，Q是葡萄糖
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