Question
Assertion: DNA synthesis occurs in $\mathrm{G}_{1}$ and $\mathrm{G}_{2}$ periods of cell cycle. Reason: During $\mathrm{G}$, and $\mathrm{G}$, phase the DNA contents become double.
Step 1
The cell cycle consists of interphase (G1, S, and G2 phases) and the mitotic phase (M phase). Show more…
Show all steps
Your feedback will help us improve your experience
Parvati Devi and 51 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
9. As cells pass through the cell cycle, their volume of DNA alternately halves and doubles. Which statement about DNA correctly explains this pattern? a. DNA replication occurs during all phases of the cell cycle. b. DNA replication occurs only during the G1 phase of the cell cycle. c. DNA replication occurs only during the S phase of the cell cycle. d. DNA replication occurs randomly, and is unrelated to the cell cycle.
Briefly describe the events that occur in each phase of interphase. a. $\mathrm{G}_{1}$ - assessment for DNA damage, S - duplication of genetic material, $\mathrm{G}_{2}$ - duplication and dismantling organelles b. $\mathrm{G}_{1}$ - duplication of organelles, S - duplication of DNA, $\mathrm{G}_{2}$ - assessment of DNA damage c. $\mathrm{G}_{1}$ - synthesis of DNA, S - synthesis of organelle genetic material, $\mathrm{G}_{2}$ - assessment of DNA damage d. $\mathrm{G}_{1}$ - preparation for DNA synthesis, S - assessment of DNA damage, M - Division of cell
It was noted on page 586 that centrosome duplication and DNA synthesis are both initiated by cyclin $\mathrm{E}-\mathrm{Cdk} 2,$ which becomes active at the end of $G_{1} .$ A recent study found that if cyclin $\mathrm{E}-\mathrm{Cdk} 2$ is activated at an earlier stage, such as the beginning of $\mathrm{G}_{1}$, that centrosome duplication begins at that point in the cell cycle, but that DNA replication is not initiated until S phase would normally begin. Provide a hypothesis to explain why DNA synthesis does not begin as well. You might look back at Figure 13.20 for further information.
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD