单项选择题

A．降低细胞质中Ca2+的浓度；B．提高细胞质中Ca2+的浓度；C．降低内质网中Ca2+的浓度；D．降低线粒体……

钙泵的作用主要是( )。

A．降低细胞质中Ca2+的浓度；
B．提高细胞质中Ca2+的浓度；
C．降低内质网中Ca2+的浓度；
D．降低线粒体中Ca2+的浓度

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单项选择题The hormone glucagons(胰高血糖素) stimulates the breakdown of stored glycogen in liver and muscle cells by the following enzymes. Which is the first enzyme that must be activated ( )

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D．Pre-rRNA is methylated
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