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【多选题】
Which of the classes of RNA molecules is/are part of the process oftranslation?（ ）
A.
Small nuclear RNA
B.
Transfer RNA
C.
Messenger RNA
D.
Ribosomal RNA
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参考答案：
参考解析：
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【单选题】The prokaryotic operator sequence is usually （ ） .
A.
located on the downstream region of promoter
B.
located on the upstream region of promoter
C.
bound by CAP
D.
bound by RNA polymerase
【单选题】Which technology can be used to identify DNA?（ ）
A.
Southern blotting
B.
Northern blotting
C.
Western blotting
D.
affinity chromatography
【多选题】The excitation cycle of the myocardium includes（ ）
A.
Absolute refractory period
B.
Relative refractory period
C.
Effective refractory period
D.
Subnormal period
E.
Supernormal period
【单选题】What is the staining reagent in the experiment?（ ）
A.
Coomassie brilliant blue
B.
Sultan red dye
C.
Ponceau
D.
Sultan black dye
【多选题】The causes of decreasing urine output during dehydration are（ ）
A.
Decreased renal blood flow
B.
Increased solute concentration in renal tubules
C.
Increased secretion of vasopressin
D.
Reduction of volume receptors by stimulation
E.
Elevated osmotic pressure of plasma crystal
【单选题】Based on the naming rules, the first letter of a restriction endonuclease means（ ）
A.
Bacterial strain
B.
Bacterial species
C.
Bacterial genus
D.
Identified order
【多选题】The mechanisms of tumor suppressor gene inactivation include（ ）
A.
hypermethylation
B.
Mutation
C.
Loss of heterozygosity
D.
Obtaining new promoter or enhancer