Discover Biology (Sixth Core Edition)
6th Edition
ISBN: 9780393936735
Author: Anu Singh-Cundy, Gary Shin
Publisher: W. W. Norton & Company
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Chapter 7, Problem 1SQ
Summary Introduction
Introduction: Cell cycle is also known as cell division. It is divided into interphase and mitotic phase. Interphase is divided into G1 phase, S phase, and G2 phase. Mitotic phase is divided into prophase, metaphase, anaphase, and telophase. This is followed by cytokinesis.
Expert Solution & Answer
Answer to Problem 1SQ
Correct answer: Option b. is given as “S phase”. Therefore, option b. is correct.
Explanation of Solution
Reasons for the correct statement:
S-phase is the replicative phase. In this phase
Hence, option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “G1 phase”. However, G1 phase is also known as gap 1 phase. This phase synthesizes the proteins and other factors required for the DNA replication.
Therefore, option a. is incorrect.
Option c. is given as “G2 phase”. However, G2 phase is also known as gap 2 phase. This phase occurs after S-phase.
So, option c. is incorrect.
Option d. is given as “division stage”. However, cell division stage is the mitotic phase. In this phase, DNA is already duplicated.
Therefore, option d. is incorrect.
Hence, options a., c, and d. are incorrect.
Conclusion
In the cell cycle, DNA is duplicated in the S phase.
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Identify the indicated cavity (Fucus).
a. antheridia
b. conceptacel
c. receptacle
d. oogonium
e. none of these
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