Log out Go to App
Go to App

Learning Materials

Features

Discover

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

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

5-Bromouracil, a highly mutagenic compound (that is, a compound that causes changes in DNA), is used in cancer chemotherapy. When administered to a patient, it is converted to the triphosphate and incorporated into DNA in place of thymine, which it resembles sterically. Why does it cause mutations?

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

If one of the strands of DNA has the following sequence of bases running in the 5'-G-G-A-C-A-A-T-C-T-G-C-3'

a. what is the sequence of bases in the complementary strand?

b. what base is closest to the 5′-end in the complementary strand?

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.

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).
See all solutions

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Read Explanation

Inorganic Chemistry

Read Explanation

Physical Chemistry

Read Explanation

Chemical Analysis

Read Explanation

Kinetics

Read Explanation

Ionic and Molecular Compounds

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free