Biology Now with Physiology (Second Edition)
Biology Now with Physiology (Second Edition)
2nd Edition
ISBN: 9780393631791
Author: Anne Houtman, Megan Scudellari, Cindy Malone
Publisher: W. W. Norton & Company
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Chapter 9, Problem 1TQ
Summary Introduction

In a cell, the replication of DNA originates at origin of replication site or location in the genome. The biological process of producing two similar replicas of DNA from single original molecule of DNA is called as DNA replication. The process of DNA replication is the basis for the biological inheritance and it occurs in whole living organisms.

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Answer to Problem 1TQ

The DNA replication results in two DNA molecules, each of which has one old strand and one new strand.

Therefore, option (c) is correct. 

Explanation of Solution

Justify the reasons for the correct statement:

The DNA is consists of a double helix structure with complementary strands. These complementary strands are separated during the replication. Then, each of the original molecules of DNA serves as a template for the generation of its counterpart. This process is termed as a semiconservative replication; as a result, the new helix will be formed from the original strand of DNA.

Option (c) is given as, “two DNA molecules, each of which has one old strand and one new strand”.

Hence, the option (c) is correct.

Justify the reasons for the incorrect statements:

Option (a) is given as, “two DNA molecules-one with two old strands, and one with two new strands”. 

The DNA replication does not results in two old strands and two new strands. It results in two molecules of DNA with one old strand and one new strand. Hence, it is a wrong answer.

Option (b) is given as, “two DNA molecules, each of which has two new strands”.   

The replication of DNA dose not results in two new strands but it contains one old strand and one new strand. Hence, it is a wrong answer.

Option (d) is given as, “none of the above”

The replication of the DNA results in two molecules of DNA one with new strand and other another with old strand. Thus, the given statement none of the above is inaccurate. Hence, it is a wrong answer.

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

Conclusion

The DNA replication is similar to all biological polymerization process. It continue by coordinated steps and three enzymatically catalyzed. Thus, the replication of DNA results in the two molecules of DNA and each has one new strand and old strand.

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