Biological Classification Flashcards
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Questions and Answers

What is the highest classification rank of living organisms?

  • Kingdom
  • Domain (correct)
  • Class
  • Phylum

    • What are the three categories of Domain?

    Eukaryotes, bacteria, and archaea.

    In biological classification, which taxonomic rank is between phylum and order?

  • Family
  • Genus
  • Class (correct)
  • Species

    • What ranks below the family in scientific classification?

    <p>Genus</p> Signup and view all the answers

    All organisms except for bacteria and archaea are eukaryotes.

    <p>True (A)</p> Signup and view all the answers

    What do we call the kingdom comprising all living or extinct animals?

    <p>Animalia</p> Signup and view all the answers

    What is a Dichotomous Key used for?

    <p>To divide organisms into smaller groups (D)</p> Signup and view all the answers

    What is the highest classification into which living organisms are grouped?

    <p>Kingdom</p> Signup and view all the answers

    What taxonomic rank is used in the classification of organisms between class and family?

    <p>Order</p> Signup and view all the answers

    Species names are usually written in uppercase and italicized.

    <p>False (B)</p> Signup and view all the answers

    What type of organisms does Archaea comprise?

    <p>Single-celled prokaryotic organisms</p> Signup and view all the answers

    What is the biological classification category that includes protozoans and most algae?

    <p>Protista</p> Signup and view all the answers

    How many divisions are there in the system of classification?

    <p>Seven</p> Signup and view all the answers

    Prokarya have their genetic material enclosed in a nucleus.

    <p>False (B)</p> Signup and view all the answers

    What is the defining trait of the Protista kingdom?

    <p>Eukaryotic organisms that are mostly unicellular</p> Signup and view all the answers

    Which ranks are part of the hierarchy of biological classification?

    <p>Kingdom, Phylum, Class, Order, Family, Genus, Species</p> Signup and view all the answers

    What distinguishes Bacteria as a group?

    <p>Microscopic living organisms, usually one-celled.</p> Signup and view all the answers

    What is the taxonomic kingdom comprising all living or extinct plants?

    <p>Plantae</p> Signup and view all the answers

    Flashcards

    Domain

    The highest level of classification, grouping organisms into three domains: Bacteria, Archaea, and Eukarya.

    Prokaryotes

    Organisms whose cells lack a nucleus and other membrane-bound organelles.

    Eukaryotes

    Organisms with cells that contain a nucleus and other membrane-bound organelles.

    Genus

    A group of closely related species, ranking below Family and above Species.

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    Species

    The most specific classification level, grouping individuals capable of interbreeding and producing fertile offspring.

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    Class

    A taxonomic rank between Phylum and Order, containing a group of related Orders.

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    Animalia

    The kingdom encompassing all animals, both living and extinct.

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    Plantae

    The kingdom encompassing all plants, both living and extinct.

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    Protista

    The diverse kingdom containing eukaryotic organisms like protozoans and algae, which can be unicellular or multicellular.

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    Dichotomous Key

    A system of classification that uses contrasting characteristics to categorize organisms, narrowing down options.

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    Classification (Taxonomy)

    The process of organizing living organisms into a hierarchical system based on their characteristics.

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    Order

    A taxonomic rank between Class and Family, containing a group of related Families.

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    Family

    A taxonomic rank below Order and above Genus, containing a group of related Genera.

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    Kingdom

    The highest classification in Linnean taxonomy, encompassing several Phyla.

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    Phylum

    A major taxonomic rank containing one or more Classes, highlighting the diversity within Kingdoms.

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    Bacteria

    One-celled organisms found everywhere, often playing important roles in fermentation and decomposition. They can be beneficial or harmful.

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    Protozoa

    Single-celled eukaryotic organisms that exhibit animal-like behaviors like movement and predation.

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    Study Notes

    Taxonomic Hierarchy

    • The highest classification rank is Domain, which contains three categories: eukaryotes, bacteria, and archaea.
    • Class ranks between Phylum and Order in biological classification.
    • Genus represents a group of related organisms, ranking below Family and above Species in taxonomy.

    Eukaryotes and Prokaryotes

    • Eukarya encompass all organisms with cells that have membrane-enclosed organelles, including animals and plants, excluding bacteria and archaea.
    • Archaea are single-celled prokaryotic organisms distinguished from bacteria by distinct molecular characteristics.

    Major Taxonomic Groups

    • Animalia refers to the kingdom containing all living and extinct animals.
    • Plantae comprises all living and extinct plants, forming one of the five biological kingdoms.
    • Protista is a diverse kingdom of eukaryotic organisms that may be unicellular or multicellular, including protozoans and algae.

    Classification Process

    • Classification (taxonomy) categorizes living organisms into a structured hierarchy: Kingdom > Phylum > Class > Order > Family > Genus > Species.
    • A Dichotomous Key uses contrasting characteristics to classify organisms into smaller groups, effectively narrowing down options.

    Species Definition

    • Species is a group of organisms capable of interbreeding and producing fertile offspring; species names are written in lowercase and italicized.

    Other Taxonomic Ranks

    • Kingdom is the highest classification in Linnean taxonomy that encompasses several Phyla.
    • Order ranks between Class and Family in the taxonomic hierarchy.
    • Family is so named for a lineage or group of related organisms, positioned between Genus and Order.

    Microorganisms

    • Bacteria are one-celled organisms found in diverse environments and can be either pathogenic or beneficial, playing important roles in fermentation and decomposition.
    • Protozoa, considered unicellular eukaryotic organisms, exhibit animal-like behaviors such as movement and predation.

    Phylum Overview

    • Phylum is a major taxonomic rank containing one or more Classes, emphasizing the diversity within kingdoms.

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    Description

    Test your knowledge with flashcards focused on biological classification. Learn about key terms such as Domain and Class, which are essential for understanding the hierarchy of living organisms. Dive into the world of taxonomy and enhance your vocabulary in this crucial area of biology.

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