The pKa of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.

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#Question id: 3768

#XL - Q Biochemistry

After the first replication was observed in their experiments testing the nature of DNA replication, Meselson and Stahl could be confident of which of the following conclusions?

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#Question id: 12752

#XL - S Microbiology

Which of the following cannot be used to remove protein contamination from nucleic acids?

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#Question id: 3032

#XL - S Microbiology

Which of these statements about prokaryotes is correct?

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#Question id: 1048

#XL - T Zoology

A virion is composed of

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#Question id: 793

#XL - T Zoology

What is the average size (in bp) of a mature t-RNA?