Comprehensive Unit Review: Biological Classification and Taxonomy

Unit Review: Classification and Taxonomy Assessment Details

• Examination Schedule: The Unit Quiz is scheduled for Wednesday, May 6th.
• Study Strategies and Resources:     * Tutorials: Students should attend tutorials to retake any Concept Checks (CC) where the score was below 80.     * Practice: Utilize Pear Assessment to practice questions from previous concept checks.     * Assignment Review: Complete and review all daily assignments located in Google Classroom (GC) and Savvas.     * In-Class Engagement: Ask questions during class and attend tutorials to clarify any lingering doubts or misconceptions.     * Additional Enrichment: Review the Quizlet at least 3 times; creating handmade flashcards is also recommended. Access the answer key in Google Classroom for corrections. Engage with the "Exploring Eukarya" interactivity in Savvas and the Gimkit posted in GC.

Fundamentals of Taxonomy and Nomenclature

• Definition of Taxonomy: A branch of science dedicated to naming organisms and classifying them based on shared physical characteristics.
• TEKS 7.14A Objective: Describe the taxonomic system used to categorize organisms based on similarities and differences shared among groups.
• Binomial Nomenclature:     * Naming System: Scientists utilize a Latin-based system known as binomial nomenclature.     * Components: A scientific name is created using two levels of classification: Genus and Species.     * Example: The scientific name for an Orca is Orcinus orca.
• Textbook Reference: For deeper study, refer to pages 515 - 529.

The Taxonomic Hierarchy

• Classification Levels (from broadest to most specific):     1. Domain (Least Specific)     2. Kingdom     3. Phylum     4. Class     5. Order     6. Family     7. Genus     8. Species (Most Specific)
• Mnemonic Device: "Do Kings Play Chess On Fancy Glass Sets" is used to remember the order of Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.

Evolutionary Relationships via Cladograms

• Cladogram Definition: Branching diagrams that illustrate when specific traits appeared throughout evolution.
• Mechanism: Each organism positioned after a "node" (the point where a branch splits) possesses the trait associated with that node.
• Example Analysis:     * Organisms with Lungs: Antelope, bald eagle, and alligator.     * Organisms with Jaws: Sea bass, antelope, bald eagle, and alligator.     * Organisms with Gizzards: Bald eagle and alligator.

Domains Bacteria and Archaea: Prokaryotic Life

• General Characteristics of Prokaryotes: These are single-celled organisms that do not possess a nucleus. They belong to the Bacteria and Archaea domains.
• TEKS 7.14B Objective: Describe characteristics of recognized kingdoms and their necessity in ecosystems, such as aiding digestion or decomposing matter.
• Kingdom Eubacteria:     * Physical Characteristics: Microscopic, unicellular, prokaryotic, possesses a cell wall, and reproduces asexually.     * Ecosystem Importance: Supports digestion in other organisms, breaks down waste, and performs nitrogen fixation in the soil.     * Location: Found almost everywhere, including inside the human body, on various surfaces, in soil, and in water. They can be helpful (digestion/food production) or harmful (causing disease).
• Kingdom Archaebacteria:     * Physical Characteristics: Microscopic, unicellular, prokaryotic, possesses a cell wall, and reproduces asexually.     * Ecosystem Importance: Useful for cleaning pollution and breaking down waste.     * Special Distinction: Known as ‘ancient bacteria’ and represent some of the oldest organisms on Earth. They are often defined as extremophiles because they thrive in harsh environments like hot springs, deep-sea vents, and acidic environments.
• Textbook Reference: Refer to pages 532 - 548.

Domain Eukarya and its Kingdoms

• General Characteristics of Eukaryotes: Organisms with a nucleus; they can be either unicellular or multicellular.
• Kingdom Protista:     * Complexity: Can be unicellular or multicellular.     * Energy Acquisition: Can be autotrophic or heterotrophic.     * Sub-categories: Can be animal-like, plant-like, or fungus-like, but do not fit perfectly into those specific kingdoms.     * Importance of Algae: Functions as a producer that generates 50–80% of the world’s oxygen and serves as a food source for aquatic organisms.     * Pathogeny: Plasmodium falciparum is a parasitic protist that causes malaria, a deadly disease transmitted via mosquito bites.
• Kingdom Fungi:     * Complexity: Most are multicellular.     * Energy Acquisition: Heterotrophic; specifically, they are decomposers (consumers) that break down dead organisms and animal debris to recycle nutrients back into the soil.     * Structure: Possess a cell wall; generally reproduce asexually.     * Note: Mushrooms are not plants because they do not perform photosynthesis; they obtain energy from waste and remains.
• Kingdom Plantae:     * Complexity: Multicellular.     * Energy Acquisition: Autotrophic via photosynthesis.     * Photosynthesis Definition: A process where plants absorb light, $CO_2$, and water to produce glucose ($C_6H_{12}O_6$) and oxygen ($O_2$).     * Structure: Possess a cell wall; can reproduce both asexually and sexually.     * Ecosystem Impact: Life would be impossible without plants because they produce the oxygen required for breathing and provide the base food source for the environment.
• Kingdom Animalia:     * Complexity: Multicellular.     * Energy Acquisition: Heterotrophic (consumers); they must eat other organisms to gain energy.     * Structure: Do not have cell walls; they possess cell membranes.     * Reproduction: Primarily sexual reproduction, which allows for genetic diversity and a variety of traits in offspring.
• Textbook Reference: Refer to pages 550 - 567.

Biological Terminology and Key Concepts

• Autotrophic: An organism capable of producing its own food/energy (e.g., a plant using photosynthesis).
• Heterotrophic: An organism that cannot produce its own food and must consume other organisms for energy (e.g., humans and animals).
• Nucleus: A specialized structure within a cell that contains genetic material or DNA.
• Mutualism: A beneficial relationship between two different species, such as bacteria assisting an organism with digestion while the bacteria receive nutrients and a habitat.
• Prokaryote vs. Eukaryote Summary:     * Prokaryote: No nucleus, unicellular.     * Eukaryote: Nucleus present, unicellular or multicellular.