Comprehensive Guide to Evolution and Biological Classification

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Biological Classification and Evolution

Terms

  1. Phylogeny: Evolutionary history and relationships (e.g., domains)

  2. Phylogenetic Tree/Cladogram: Diagram reconstructing history based on morphology/physical behavior

  3. Heterotrophic: Consumers (cannot produce their own food)

  4. Autotrophic: Producers (can produce their own food – e.g., photosynthesis in plants)

  5. Cephalization: Cluster/concentration of sensory organs (e.g., brain, nerves)

Binomial Nomenclature

Developed by Carl Linnaeus, binomial nomenclature uses genus

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Evolution and Classification of Life

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Terms

  1. Phylogeny: Evolutionary history and relationships (e.g., domains)

  2. Phylogenetic Tree/Cladogram: Diagram reconstructing history based on morphology/physical behavior

  3. Heterotrophic: Consumers (cannot produce their own food)

  4. Autotrophic: Producers (can produce their own food – e.g., photosynthesis in plants)

  5. Cephalization: Cluster/concentration of sensory organs (e.g., brain, nerves)


Carl Linnaeus

  • Binomial nomenclature: Uses genus and species names to name the organism (e.g., Homo sapiens, Escherichia

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Viral Structure and Replication

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1. Viral Structure

Hepadnaviruses

Enveloped

Virus Particle: Contains ds/ssDNA, unusual

Covering-Capsid: Protein coat surrounded by capsomers.

Envelope: (Not found in all viruses).

Central Core – Nucleic Acid Molecules: (DNA or RNA) Double/single strand DNA/RNA, every viron has it.

Matrix Proteins: Enzymes not found in all viruses.

HepB

  • Break in skin/blood, STD
  • Flu-like symptoms, jaundice

2 Shapes

  • Helical
  • Icosahedral

Non-Enveloped Viruses

Adenoviruses/Papillomaviruses/Polyomaviruses/Parvoviruses

Adeno

  • Infect lymphoid
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Antimicrobial Agents and Microbial Virulence Factors

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Chapter 9: Sanitization and Disinfection

Disinfection in Public Places

Action of Antimicrobial Agents:

  1. Alteration of cell wall or cytoplasmic membrane
  2. Interference with protein and nucleic acid structures

Effectiveness of Antimicrobial Agents:

  • High-Level: Kill all pathogens (besides prions)
  • Intermediate-Level: Kill fungal spores, protozoan cysts, viruses, and pathogenic bacteria.
  • Low-Level: Kill vegetative bacteria, fungi, protozoa, and some viruses.

Antimicrobial Agents: Heat, dry heat, refrigeration and

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Organization and Function of the Central Nervous System

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Central Nervous System (CNS)

Brain and Spinal Cord

Cephalization

  • Evolutionary development of the anterior CNS
  • Increased number of neurons in the head
  • Highest level reached in the human brain

Embryonic Development

  • Brain and spinal cord begin as a neural tube
  • Three primary vesicles form at the anterior end:
    • Prosencephalon (forebrain)
    • Mesencephalon (midbrain)
    • Rhombencephalon (hindbrain)
  • Posterior end becomes the spinal cord

Embryonic Development: Five Secondary Brain Vesicles

  • Forebrain (prosencephalon) divides into:
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Microbiology Lab Techniques & Procedures

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Pasteur’s Gooseneck Flask Experiment

Nutrient-rich broth in an S-shaped flask was boiled and left open to the air.
Observation: Nothing grew in the broth.
Conclusion: This experiment disproved spontaneous generation, demonstrating that bacteria trapped in the flask’s vent prevented contamination.

Gram Stain

Purpose: To separate bacteria into two categories (Gram-positive and Gram-negative) based on cell wall structure.

Mechanism:

Gram-positive bacteria have a thick peptidoglycan layer in their cell wall
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