• Môn Sinh học - Chapter 24: The origin of speciesMôn Sinh học - Chapter 24: The origin of species

    Many new species arise from a single common ancestor Occurs when: A few organisms make way to new, distant areas (allopatric speciation) Environmental change  extinctions  new niches for survivors Eg. Hawaiian archepelago

    ppt23 trang | Chia sẻ: huyhoang44 | Ngày: 19/03/2020 | Lượt xem: 582 | Lượt tải: 0

  • Môn Sinh học - Chapter 25: The history of life on earthMôn Sinh học - Chapter 25: The history of life on earth

    Sedimentary rock (layers called strata) Mineralized (hard body structures) Organic – rare in fossils but found in amber, frozen, tar pits Incomplete record – many organisms not preserved, fossils destroyed, or not yet found

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  • Môn Sinh học - Chapter 26: Phylogeny and the tree of lifeMôn Sinh học - Chapter 26: Phylogeny and the tree of life

    Principle of maximum parsimony: use simplest explanation (fewest DNA changes) for tree – “keep it simple” Molecular clocks: some regions of DNA appear to evolve at constant rates Estimate date of past evolutionary events Eg. Origin of HIV infection in humans= 1930’s

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  • Môn Sinh học - Chapter 35: Plant structure, growth, and developmentMôn Sinh học - Chapter 35: Plant structure, growth, and development

    Anchors plant, absorbs H2O & minerals, stores sugars/starches Root hairs – tiny extensions of epidermal cells, increase surface area for H2O and mineral absorption Mycorrhizae: fungus + plant root symbiotic relationship

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  • Môn Sinh học - Chapter 36: Resource acquisition and transport in vascular plantsMôn Sinh học - Chapter 36: Resource acquisition and transport in vascular plants

    Review: Selectively permeable membrane: osmosis, transport proteins, selective channels Proton pump: active transport; uses E to pump H+ out of cell  proton gradient Cotransport: couple H+ diffusion with sucrose transport Aquaporin: transport protein which controls H2O uptake/loss

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  • Môn Sinh học - Chapter 37: Plant nutritionMôn Sinh học - Chapter 37: Plant nutrition

    Rhizobium bacteria supply nitrogen at roots (fix atmospheric N2 to usable N) Plant supplies sugar & amino acids Mycorrhizae (plant + fungus)

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  • Sinh học - Chapter 38: Angiosperm reproductionSinh học - Chapter 38: Angiosperm reproduction

    Egg cell  plant embryo Ovules inside ovary  seeds Ripe ovary  fruit Fruit protects enclosed seed(s) Aids in dispersal by water, wind, or animals

    ppt33 trang | Chia sẻ: huyhoang44 | Ngày: 19/03/2020 | Lượt xem: 572 | Lượt tải: 0

  • Sinh học - Chapter 40: Basic principles of animal form and functionSinh học - Chapter 40: Basic principles of animal form and function

    Anatomy: the study of the biological form (STRUCTURE) of an organism Physiology: the study of the biological FUNCTIONS an organism performs Structure dictates function!

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  • Sinh học - Chương 41: Warm upSinh học - Chương 41: Warm up

    Ingestion: eating Digestion: breakdown of food into small molecules Mechanical (chewing, grinding) Chemical (enzymes) Absorption: cells take up nutrients Elimination: pass undigested materials from digestive system

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  • Môn Sinh học - Chương 42: Warm upMôn Sinh học - Chương 42: Warm up

    The pacemaker is regulated by two portions of the nervous system: the sympathetic and parasympathetic divisions The sympathetic division speeds up the pacemaker The parasympathetic division slows down the pacemaker The pacemaker is also regulated by hormones (epinephrine) and temperature

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