MCAT Basics (from MedSchoolCoach) The Cell Cycle
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May 12, 2026 Delve into the fascinating world of the cell cycle! Discover the critical phases of interphase and mitosis, and learn how cells grow and prepare for division. Uncover the intricate regulation of the cycle through key checkpoints, particularly the role of the p53 protein in maintaining DNA integrity. The conversation also reveals how disruptions in these processes can lead to cancer, highlighting the importance of understanding cell behavior in disease context. Plus, explore intriguing links between growth hormones and cancer risk!
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G1 Is Quiet But Biochemically Active
- G1 is a growth phase where the cell increases proteins, nucleotides, organelles, mitochondria, and ribosomes.
- Microscopically it looks inactive, but major biosynthesis prepares the cell for DNA replication.
Pause Before S If DNA Is Damaged
- Cells can pause in G1, enter G0, or proceed to S depending on readiness and DNA integrity.
- Check for DNA damage before S to avoid replicating mutations that could seed tumors.
S Phase Prioritizes DNA And Histones
- S phase duplicates genomic DNA and centrosomes while globally slowing protein production except for histone synthesis.
- Histone upregulation packs replicated DNA and affects later gene expression.
