Biology: Life on Earth with Physiology (11th Edition)
Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 12, Problem 1MC

If a parental DNA strand has the base sequence A-T-T-G-C-A-C-T, DNA polymerase would synthesize a new strand with the sequence

  1. a. A-T-T-G-C-A-C-T.
  2. b. T-A-A-C-G-T-G-A.
  3. c. C-G-G-T-A-C-A-G.
  4. d. The sequence of the new strand cannot be determined from the information given.
Expert Solution & Answer
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Summary Introduction

Introduction:

DNA is “Deoxyribonucleic acid” as it serves as the genetic material for all eukaryotic and prokaryotic cell. It carries all the information which is required for proper growth, development, in an organism.

Answer to Problem 1MC

Correct answer:

DNA polymerase would synthesize a new strand with the sequence T-A-A-C-G-T-G-A. Therefore, option (b)   is correct.

Option (b). is given as “ T-A-A-C-G-T-G-A ”.

Explanation of Solution

Justify reasons for the correct statement:

If the parent strand is having A-T-T-G-C-A-C-T then DNA polymerase enzyme would synthesize a new strand such as T-A-A-C-G-T-G-A. DNA polymerase enzyme is responsible for DNA replication. DNA is formed of nucleotide bases such as purine and pyrimidine bases, deoxyribose sugar, and a phosphate group. Adenine and guanine are purine bases whereas cytosine, thymine is pyrimidine bases. Adenine pairs with thymine by two hydrogen bond and cytosine pairs with thymine by three hydrogen bond. The DNA is a double helical structure in which two strands are complementary to each other.

Hence, option (b). is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “ A-T-T-G-C-A-C-T ”.

DNA is a double helical structure in which the two strands are complementary to each other. Adenine always bonds with thymine and guanine always binds with cytosine. Hence, it is a wrong answer.

Option (c) is given as “ C-G-G-T-A-C-A-G ”.

The two DNA strands are complementary to each other and adenine always paired with thymine, not with cytosine. Hence, it is a wrong answer.

Option (d) is given as “The sequence of the new strand cannot be determined from the information given”.

The new sequence form is T-A-A-C-G-T-G-A from the given information. The sequence can be determined as Adenine pair with thymine and cytosine pair with guanine. Hence, it is a wrong answer.

Hence, options (a), (c,) and (d) are incorrect.

Conclusion

The new strand of DNA formed by DNA polymerase enzyme is T-A-A-C-G-T-G-A as the two strands of DNA are complementary to each other.

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