Chapter 26: Q31P (page 1180)
If an mRNA contained only U and G in a random sequence, what amino acids would be present in the protein when the mRNA is translated?
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Which of the following pairs of dinucleotides are present in equal amounts in DNA?
A. CC and GG
B. CG and GT
C. CA and TG
D. CG and AT
E. GT and CA
F. TA and AT
Indicate whether each functional group of the five heterocyclic bases in nucleic acids is a hydrogen bond acceptor (A), a hydrogen bond donor (D), or both (D/A).
a. Using the single-letter abbreviations for the amino acids in Table 21.2, write the sequence of amino acids in a tetrapeptide represented by the first four different letters in your first name. Do not use any letter twice. (Because not all letters are assigned to amino acids, you might have to use one or two letters in your last name.)
b. Write one of the sequences of bases in mRNA that would result in the synthesis of that tetrapeptide.
c. Write the sequence of bases in the sense strand of DNA that would result in the formation of that fragment of mRNA.
Using the D, A, and D/A designations in Problem 3, indicate how base pairing would be affected if the bases existed in the enol form
In acidic solutions, nucleosides are hydrolyzed to a sugar and a heterocyclic base. Propose a mechanism for this reaction.
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