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The content of which chemical element is usually constant in a nucleic acid: ____

A. C
B. O
C. N
D. H
E. P

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Two important experiments to prove that DNA is genetic material are: virulence transformation experiment of Diplococcus pneumoniaand infection experiment of T2 phage to E. coli. The key point of these two experiments is:

A. DNA isolated from infected organisms can be used as pathogenic agents.
B. It is DNA mutation that cause the loss of virulence.
C. Foreign DNA (not protein) absorbed by organisms changed genetic potency.
DNA cannot be transferred between different organisms, so it must be a very conservative molecule.
E. DNA of eukaryotes, prokaryotes and virus can be mixed and replaced with each other.

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A gene is the DNA sequences encoding a protein():( )

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TheN terminal of core histone is necessary to form 30nm fiber of chromotin.( )

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The diameter of beads-on-a-string structure of nucleosome is 30nm, to which linker DNA is connected to form 30nm fiber.( )

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The content of which chemical element is usually constant in a nucleic acid: ____

A. C B. O C. N D. H E. P

Two important experiments to prove that DNA is genetic material are: virulence transformation experiment of Diplococcus pneumoniaand infection experiment of T2 phage to E. coli. The key point of these two experiments is:

A gene is the DNA sequences encoding a protein():( )

TheN terminal of core histone is necessary to form 30nm fiber of chromotin.( )

The diameter of beads-on-a-string structure of nucleosome is 30nm, to which linker DNA is connected to form 30nm fiber.( )

A. C
B. O
C. N
D. H
E. P