Comprehensive Biology Unit Review: Taxonomy, Classification, and Ecosystem Dynamics

Unit Assessment and Study Guidelines

  • Unit Quiz Schedule: The Unit Quiz is scheduled for Wednesday, May 66th.

  • Mandatory Study Tasks:     * CC Retakes: Students should attend tutorials to retake any Concept Check (CC) where the grade achieved was below 8080.     * Pear Assessment: Practice questions on identified concept checks should be completed within Pear Assessment.     * Daily Assignments: Complete and review all daily assignments located in Google Classroom (GC) and Savvas.     * Clarification: Students are encouraged to ask questions in class and attend tutorials to clarify any doubts or misconceptions.

  • General Study Tools:     * Quizlet: Review the unit Quizlet at least 33 times.     * Handmade Flashcards: Creating physical flashcards is recommended as a highly effective study method.     * Resource Review: Use the provided Answer Key in Google Classroom to make corrections to previous work.     * Interactive Enrichment: Use the "Exploring Eukarya" enrichment in Savvas and the Gimkit posted in Google Classroom.

Taxonomy and Classification Fundamentals (TEKS 7.14A7.14A)

  • TEKS 7.14A7.14A Standard: Describe the taxonomic system that categorizes organisms based on similarities and differences shared among groups.

  • Definition of Taxonomy: Taxonomy is a branch of science that names organisms and classifies them based on their shared physical characteristics.

  • Naming System: Scientists utilize a Latin-based system for naming organisms known as Binomial Nomenclature.

  • Hierarchical Classification Order: The layers of classification move from the least specific (broadest) to the most specific. The order is as follows:     * Domain (Least Specific)     * Kingdom     * Phylum     * Class     * Order     * Family     * Genus     * Species (Most Specific)

  • Mnemonic Device for Classification: To remember the order (Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species), use the mnemonic: "Do Kings Play Chess On Fancy Glass Sets."

  • Resource Reference: Related material can be found on pages 515515-−-529 in the course textbook.

Binomial Nomenclature and Phylogeny

  • Naming Components: To create a scientific name via binomial nomenclature, the two levels of classification used are the Genus and the Species.

  • Scientific Name Example: The scientific name for a Killer Whale (Orca) is Orcinus orca.

  • Cladograms: These are branching diagrams used to illustrate when specific traits appeared in the evolutionary timeline.     * Rule of Nodes: Every organism positioned after a specific "node" on the diagram possesses that associated trait.     * Cladogram Relationship Examples:         * Organisms with lungs: Antelope, bald eagle, alligator.         * Organisms with jaws: Sea bass, antelope, bald eagle, alligator.         * Organisms with gizzards: Bald eagle, alligator.

Prokaryotic Domains: Archaea and Bacteria (TEKS 7.14B)</h3><ul><li><p><strong>TEKS)</h3><ul><li><p><strong>TEKS7.14B Standard: Describe the characteristics of the recognized kingdoms and their importance in ecosystems, such as bacteria aiding digestion or fungi decomposing organic matter.

  • Prokaryote Definition: Single-celled organisms that do not have a membrane-bound nucleus. These belong to the Bacteria and Archaea domains.

  • Kingdom Eubacteria Characteristics:     * Physical: Microscopic, unicellular, and prokaryotic.     * Structure: Possesses a cell wall.     * Reproduction: Asexual reproduction.     * Ecosystem Importance: Supports digestion in organisms, breaks down waste, and fixes nitrogen within the soil.     * Habitat: Found almost everywhere, including inside the human body, on various surfaces, in soil, and in water. Can be helpful (digestion) or harmful (disease-causing).

  • Kingdom Archaebacteria Characteristics:     * Physical: Microscopic, unicellular, and prokaryotic.     * Structure: Possesses a cell wall.     * Reproduction: Asexual reproduction.     * General Context: Known as "ancient bacteria" and represent some of the oldest organisms on Earth.     * Ecosystem Importance: Involved in cleaning pollution and breaking down waste products.     * Extremophiles: This kingdom includes extremophiles, which thrive in environments such as hot springs, deep-sea vents, and highly acidic locations.

  • Resource Reference: Related material can be found on pages 532−--548548 in the course textbook.

    • Domain Eukarya: Protista, Fungi, Plantae, and Animalia

    • Eukaryote Definition: Organisms composed of one or more cells that contain a distinct nucleus with genetic material (DNADNA).

    • Kingdom Protista:     * Structure: Both unicellular and multicellular.     * Trophic Type: Both autotrophic and heterotrophic.     * Cell Wall: Mixed. For example, Amoeba have cell membranes, while Algae have cell walls.     * Reproduction: Mostly asexual.     * Ecosystem Role: Protists like algae are vital as they serve as producers that generate 5050-−-80\% of the world's oxygen and serve as a primary food source in aquatic environments.     * Pathogens: Plasmodium falciparum is a dangerous protist parasite that causes Malaria, a deadly disease transmitted via mosquito bites.

    • Kingdom Fungi:     * Structure: Mostly multicellular.     * Trophic Type: Heterotrophic (Decomposers). They are not plants because they do not perform photosynthesis; they are technically considered consumers because they break down dead organisms.     * Cell Wall: Present.     * Reproduction: Mostly asexual.     * Ecosystem Role: Decomposers (like mushrooms) break down plant and animal debris to return nutrients to the soil and eliminate waste.

    • Kingdom Plantae:     * Structure: Multicellular.     * Trophic Type: Autotrophic; they produce their own food using photosynthesis.     * Cell Wall: Present.     * Reproduction: Both asexual and sexual. Example: Sunflower.     * Ecosystem Role: Vegetation provides the environment with oxygen; without plants, life would be impossible.

    • Kingdom Animalia:     * Structure: Multicellular.     * Trophic Type: Heterotrophic; they must consume other organisms for food/energy.     * Cell Wall: No cell wall; they possess cell membranes.     * Reproduction: Mostly sexual, which allows for a high variety of traits to be passed to offspring. Examples: Dog, cat, cow, humans.

    • Resource Reference: Related material can be found on pages 550−--567567 in the course textbook.

    Key Ecological and Biological Terms

    • Heterotrophic: An organism that cannot produce its own food and must consume other organisms for energy. Examples: Humans and animals.

    • Autotrophic: An organism that can produce its own food. Example: A plant using photosynthesis.

    • Photosynthesis: The biological process where plants absorb light, CO2CO_2, and water to create food (glucose) and release oxygen.

    • Mutualistic Relationship: A relationship beneficial to both organisms involved. Example: Bacteria aiding an organism's digestion.

    • Unicellular: An organism consisting of a single cell.

    • Multicellular: An organism consisting of multiple cells.

    • Nucleus: A specific structure within a cell that houses genetic material (DNADNA).