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【多选题】
贵州少数民族能歌善舞,下列关于贵州少数民族音乐表述正确的有()。A.
“ 飞歌 ” 堪称苗族歌唱艺术的瑰宝
B.
打闹歌是土家族山歌的一种
C.
“ ” 是反映青年男女爱情生活为内容的彝族民歌
D.
侗族 “ 大歌 ” 是中国唯一采用和声的民歌系统，基本为女声无伴奏合唱
E.
水族民歌和汉族音乐风格相似，以五声音阶为主，歌词有明显的对仗格式
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【单选题】What is the pH of an aqueous solution at 25.0 °C in which [H + ] is 0.00250 M ?
A.
3.4
B.
2.6
C.
-2.6
D.
-3.4
E.
2.25
【单选题】What is the pH of an aqueous solution at 25.0 °C in which [OH - ] is 0.00250 M?
A.
2.6
B.
-2.6
C.
11.4
D.
-11.4
E.
-2.25
【单选题】Which of the following enzymes would you expect to be most active in an environment where the pH was 2.0 ? What is the substrate for this enzyme?
A.
pepsin, starch
B.
Trypsin, protein
C.
amylase, starch
D.
pepsin, protein
E.
enterokinase, neutral fat
【简答题】If we want to preapre a physlogical buffer solution with pH about 7.40 at body temperature (37°C), what volume of 0.05 mol/L hydrochloride acid should be added to 100 mL of a buffer solution in which...
【单选题】Phenyl-methane-sulfonyl-fluoride (PMSF) inactivates serine proteases by binding covalently to the catalytic serine residue at the active site; this enzyme-inhibitor bond is not cleaved by the enzyme. ...
A.
irreversible
B.
competitive
C.
noncompetitive
D.
mixed
E.
pH inhibition
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