单项选择题X 纠错
A.Transmission(透射) electron microscope
B.Scanning electron microscope
C.Differential centrifugatioin(差速离心)
D.X-ray crystallography
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单项选择题
A. Water leaves the cell by osmosis.
B. C1- is diffusing through transmembrane channels.
C. C1- diffusion is aided by a mobile carrier.
D.An active transport symport transports C1-/H+.
E.None of the above
单项选择题
A.Stomach(胃) and kidneys
B.Smooth muscle
C.Heart muscle
D.Intestinal epithelial tissue(肠表皮组织)
单项选择题
A.Protein kinase A
B.Phosphorylase kinase
C.Glycogen phosphorylase
D.Protein phosphatase
E. Protein phosphatase inhibitor-1
单项选择题
A.25-50% of the pre-rRNA is degraded
B. Pre-rRNA binds to ribosomal protein
C. Pre-rRNA is cut to form three classes of rRNA
D.Pre-rRNA is methylated
E.The rRNA gene for the 40S subunit is transcribed separately