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General Biology: Key Concepts in Fungi, Animal Diversity, Invertebrates, and Vertebrates

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  • Major characteristics of fungi

    Fungi are heterotrophic, use absorptive nutrition, are sessile, usually multicellular, have cell walls made of chitin, and have bodies made of mycelium.

  • Fungi and animals relationship

    Fungi belong to Opisthokonta and share characteristics with animals, such as heterotrophy and certain molecular features.

  • Fungi life cycle stages

    Fungi life cycle includes haploid stages (spores and hyphae), a dikaryotic stage (two nuclei per cell), and a short diploid stage during sexual reproduction.

  • Fungi body structure and growth

    Fungi bodies consist of hyphae forming a mycelium. Growth occurs at hyphal tips, and reproductive structures produce spores.

  • Ecological roles of fungi

    Fungi act as decomposers, form mycorrhizal associations with plants, act as pathogens, form lichens with algae, and have biotechnological applications.

  • Hyphal tip growth mechanism

    Fungi grow by extending hyphal tips through localized cell wall synthesis and cytoplasmic expansion.

  • Definition of hyphae and mycelium

    Hyphae are threadlike filaments; a mycelium is a network of hyphae forming the fungal body.

  • Characteristics of animals

    Animals are heterotrophic, multicellular, lack cell walls, usually have nerves and muscles, and can move.

  • Cambrian Period and animal diversity

    The Cambrian Period saw rapid animal diversification due to new ecological niches and evolutionary innovations.

  • Bilateral symmetry advantage

    Bilateral symmetry allows directional movement and more complex nervous systems for active lifestyles.

  • Diploblastic vs. triploblastic animals

    Diploblastic animals have two germ layers (ectoderm and endoderm); triploblastic have three (ectoderm, mesoderm, endoderm).

  • Animal gametic life cycle

    Animals reproduce sexually with a gametic life cycle where the diploid stage dominates and gametes are haploid.

  • Protostome vs. deuterostome development

    Protostomes develop the mouth from the blastopore; deuterostomes develop the anus from the blastopore.

  • Definition of tissue and symmetry terms

    Tissue: group of similar cells; bilateral symmetry: one plane divides body into mirror halves; radial symmetry: multiple planes.

  • Major invertebrate phyla

    Includes Porifera, Cnidaria, Platyhelminthes, Mollusca, Annelida, Nematoda, Arthropoda, Echinodermata, and Chordata.

  • Adaptive value of exoskeleton

    Exoskeleton provides protection and support but requires molting for growth.

  • Water vascular system function

    In echinoderms, the water vascular system aids in locomotion, feeding, and gas exchange using tube feet.

  • Chordate defining characteristics

    Chordates have a notochord, dorsal hollow nerve cord, pharyngeal slits, post-anal tail, and endostyle.

  • Major vertebrate adaptations

    Vertebrates evolved vertebral columns, jaws, endoskeletons, lungs, limbs, amniotic eggs, and hair.

  • Tetrapod adaptations for land

    Tetrapods developed limbs, stronger skeletons, and lungs to transition to terrestrial life.

  • Amniote adaptations for dry environments

    Amniotes have amniotic eggs, internal fertilization, desiccation-resistant skin, and thoracic breathing.

  • Main groups of mammals

    Mammals include monotremes (egg-laying), marsupials (pouched), and eutherians (placental).

  • Primate characteristics

    Primates have grasping hands, forward-facing eyes, and large brains; groups include monkeys, apes, and humans.

  • Human evolutionary traits

    Humans evolved bipedalism, larger brains, and tool use; genus Homo originated in Africa with overlapping species.