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单项选择题

肌动蛋白纤维对于黏着斑就像( )对于半桥粒。

A．肌球蛋白纤维
B．角蛋白纤维
C．微丝
D．钙粘着蛋白

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单项选择题Developing frog embryos treated with anti-fibronectin antibodies

A．Develop normally.( )
B．Stop cell division.
C．Have abnormal cell migration(迁移).
D．Don't exhibit action potentials.

单项选择题All of the following are true about antisense RNA except ( )

A．Is complementary to mRNA.
B．Forms double-stranded RNA.
C．Joins with the 30S subunit.
D．Inhibits protein synthesis.

单项选择题The 5S rRNA differs from the other cellular rRNAs in which of the following ways ( )

A．The genes are located outside the nucleolus(核仁).
B．The genes are transcribed by RNA polymerase III.
C．The promoter region of the 5S rRNA gene is internal to the gene.
D． all of the above

单项选择题A eukaryotic cell has( )

A．One copy of each ribosomal transcription unit.
B．Thousands of copies of the 5S rRNA gene.
C．Two copies of each gene for rRNA and ribosomal proteins.
D．Two copies of each gene for rRNA and one copy of each ribosomal proteingene.

单项选择题Which one of the following was used to determine the structure of the DNA molecule ( )

A．Transmission(透射) electron microscope
B．Scanning electron microscope
C．Differential centrifugatioin(差速离心)
D．X-ray crystallography