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Chapter 26: Q4P (page 1162)

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

Short Answer

Expert verified

Purine based heterocyclic bases

Pyrimidine based heterocyclic bases

Step by step solution

01

Base pairings

The base pairing is dictated by hydrogen bonding.Adenine forms two hydrogen bonds with thymine but would form only one hydrogen bond with cytosine. Guanine forms three hydrogen bonds with cytosine but would form only one hydrogen bond with thymine.

02

Base pairing in the enol form

If the bases existed in enol form, the hydroxyl group and amine group could act either as hydrogen bond acceptors (A), as hydrogen bond donors (D) ot both A/D.

Hydrogen bonds that can form between enol form bases are one between thymine and adenine and two between cytosine and guanine. Thus, base pairing will be affected if the base existed in the enol form.

Purine based heterocyclic bases

Pyrimidine based heterocyclic bases

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Most popular questions from this chapter

RNAase, the enzyme that catalyzes the hydrolysis of RNA, has two catalytically active histidine residues at its active site. One of the histidine residues is catalytically active in its acidic form, and the other is catalytically active in its basic form. Propose a mechanism for RNAase.

Which cytosine in the following sense strand of DNA could cause the most damage to the organism if it is deaminated?

A-T-G-T-C-G-C-T-A-A-T-C

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?

Why is the codon a triplet rather than a doublet or a quartet?

Staphylococcus nuclease is an enzyme that catalyzes the hydrolysis of DNA. The reaction is catalyzed by Ca2+, Glu 43, and Arg 87. Explain how the metal catalyst facilitates this reaction. Recall that the nucleotides in DNA have phosphodiester linkages.
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