6- Biología celular. Resolución de ejercicio modelo

Introduction to Biological Phenomena

Overview of Homeostasis and Bacteria

• The session begins with a clarification on homeostasis, defined as the ability to maintain stability within an organism.

• Bacteria are introduced as prokaryotic organisms, meaning they lack a membrane-bound nucleus. This concept will be explored in more detail in future tutorials.

Recap of Previous Blocks

• The first block covered various levels of organization in matter.

• The second block discussed characteristics shared by all living organisms.

• The third block focused on classification criteria for living beings.

Model Exercise on Viruses

Understanding Viruses

• Viruses are defined as agents composed of genetic information (nucleic acid) protected by a protein coat or capsid; they are not cellular entities.

• As pathogens, viruses can infect plants, bacteria, and animals but do not meet the criteria for being classified as living organisms.

Characteristics of Viruses

• Key characteristics absent in viruses include:

• Lack of cellular structure.

• Absence of metabolism and irritability.

• Inability to grow or develop independently.

• No capacity for autopoiesis (self-production).

• Present characteristics include:

• Organization and complexity from macromolecules like proteins and nucleic acids.

• Ability to exchange matter and energy with their environment (open systems).

• Capacity to reproduce using host cells and adapt/evolve over time.

Exercise Guidelines

Merging Concepts with Practical Application

• Students are advised to mention both present and absent characteristics when discussing viruses.

• Explanation should focus on one characteristic from each category, emphasizing clarity over quantity—students should aim for concise yet comprehensive descriptions.

Final Thoughts