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69- Biología celular. Ciclo celular
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69- Biología celular. Ciclo celular

Introduction to Cell Biology

Overview of the Session

  • The session is led by Alejandro, a biology instructor, focusing on cell division and the cell cycle.
  • Topics include mitosis today and meiosis in the next tutorial, along with an exercise that may appear on an exam.

Importance of Additional Study

  • Students are encouraged to review mandatory literature for deeper understanding beyond the tutorial content.
  • Questions can be addressed in forums related to the second partial exam materials.

Understanding the Cell Cycle

Characteristics of Living Organisms

  • All living beings share certain characteristics, including a life cycle that encompasses birth, growth, reproduction, and death.

The Cell Cycle Defined

  • The cell cycle consists of two main phases: interphase (the longer phase) and mitotic phase (when cells divide).

Types of Cell Division

  • Focus will be on mitosis today; meiosis will be discussed in future sessions.

Cellular Development and Differentiation

Formation of Gametes

  • Gametogenesis leads to the formation of sex cells; fertilization transforms an ovum into a zygote which divides into billions of cells forming an adult organism.

Cellular Organization

  • Cells differentiate based on their functions leading to tissue formation, organ development, and ultimately complete organisms.

Phases of Interphase

Breakdown of Interphase

  • Interphase is divided into three periods: G1 (cell growth), S (DNA synthesis), and G2 (preparation for mitosis).

Duration Variability

  • The duration varies depending on cell type; some cells like muscle or neurons rarely divide while others like intestinal epithelial cells have high turnover rates.

Functions During G1 Phase

Cellular Activities in G1 Phase

Metabolism and Cell Division

Overview of Cell Metabolism Phases

  • The discussion begins with the concept of cell metabolism, specifically focusing on the S phase, which stands for synthesis. This phase is crucial as it involves the replication of genetic material within the cell.
  • During this S phase, not only does the cell duplicate its genetic material, but it also replicates other essential components such as organelles. This ensures that each daughter cell receives all necessary cellular components during division.