Capturing Solar Energy: Photosynthesis. Photosynthesis. Life depends on photosynthesis. Photosynthesis
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1 Capturing Solar Energy: Photosynthesis (a) (b) internal leaf structure Photosynthesis (c) chloroplast in mesophyll cell outer membrane inner membrane thylakoid stroma vein channel interconnecting thylakoids stoma mesophyll cells chloroplasts Complex series of chemical reactions involving a transition in forms of energy Uses light energy to make food and is a process by which some organisms can make organic compounds from simple inorganic compounds using energy from the sun Photosynthesis Life depends on Light energy captured and stored as chemical potential energy in the covalent bonds of carbohydrate molecules 6 CO H 2 O + light C 6 H 12 O O 2 A. Foundation of energy for most ecosystems B. Source of oxygen C. Key component of the carbon cycle
2 The mechanism of Solar energy and light The electromagnetic spectrum Pigment molecules absorb some wavelengths of light and reflect others Chlorophyll a green photosynthetic pigment associated with the thylakoid membranes of chloroplasts (b) chlorophyll carotenoids phycocyanin (a) (c) The mechanism of Chloroplasts are the sites of Have a membrane system within internal space (stroma) Arranged in disk-shaped sacks (thylakoids) The thylakoids contain light-harvesting photosynthetic pigments & enzymes Internal membranes define space (lumen) that is separate from the rest of the stroma
3 chloroplast thylakoids The mechanism of Photosynthesis occurs in two steps 1. Light-dependent reactions reaction center a. Provides the energy necessary to fix carbon b. Occurs in the thylakoid membranes c. Generates ATP electron transport system light- harvesting complex d. Photolysis light, electrons and water 7 8 The mechanism of electron transport system 4 energy to drive synthesis reaction center 5 6 photosystem I reaction center Energy carriers ATP and NADPH transport energy from the lightdependent reactions to the lightindependent reactions photosystem II 9 energy from sunlight The mechanism of 2. Light-independent reactions Light-dependent reactions occur in thylakoids. Light-independent reactions (C 3 cycle) occur in stroma. a. Uses energy of the light-dependent reaction to make sugar from CO 2 b. Occurs in the stroma
4 1 Carbon fixation combines CO 2 with RuBP. C 4 plants utilize an alternate pathway to make sugars in dry environments 3 RuBP regeneration uses energy and 10 G3P. 2 G3P synthesis uses energy. Closing stomata to conserve water results in photorespiration in C 3 plants 2 G3P available for synthesis of organic molecules. (a) C 3 plants use the C 3 pathway mesophyll cell in C 3 plant The History of Life on Earth In a C 3 plant, most chloroplasts are in mesophyll cells. (b) C 4 plants use the C 4 pathway mesophyll cell in C 4 plant bundlesheath cells In a C 4 plant, both mesophyll and bundle-sheath cells contain chloroplasts. Much glucose synthesis occurs. bundle-sheath cell in C 4 plant Much photorespiration occurs under hot, dry conditions. CO 2 is captured with a highly specific enzyme. Almost no photorespiration occurs in hot, dry conditions. When did life arise on Earth? The Earth is thought to be approximately 4.6 billion years old, but life is believed to have occurred approximately 4 billion years ago (bya) How did life begin??? : Early Ideas Spontaneous Generation idea popular in the s living things come from the nonliving evidence: beetles and other insect larvae arise from cow dung; frogs emerge from mud Francesco Redi experiment with flies and wide-mouth jars In 1688, the Italian Francisco Redi In 1668, Francesco Redi, an Italian physician, did an experiment with flies and wide-mouth jars. He demonstrated that meat that was covered did not produce maggots This may have been the first true scientific experiment
5 Spontaneous generation Mid-1800s disproved by Louis Pasteur and John Tyndall no growth growth Other Ideas: Life from a Biblical Creation? Christian Creationism states that the world, including all life, was created about 6,000 years ago in six literal days by a God. Broth in flask is boiled to kill preexisting microorganisms. Condensing water collects as the broth cools, sealing the mouth of the flask. If neck is later broken off, outside air can carry microorganisms into broth. But how does one accurately and fairly test for this?... What s the observation, hypothesis, test? This idea does not really fit into the confines of a Science course. Like the study of French Impressionist painters, Religion is not part of, nor adequately covered in, a Science course. Origin of Life: Another idea Biogenic-looking features in ALH84001 Martian meteorite Extra-terrestrial Origins In 1969, a meteorite (left-over bits from the origin of the solar system) landed near Allende, Mexico. The Allende Meteorite (and others of its sort) have been analyzed and found to contain amino acids, the building blocks of proteins. This idea of panspermia hypothesized that life originated out in space and came to earth inside a meteorite. The amino acids recovered from meteorites are in a group known as exotics: they do not occur in the chemical systems of living things. The ET theory is now discounted by most scientists, although the August 1996 discovery of the Martian meteorite and its possible fossils have revived thought of life elsewhere in the Solar System. Anyway.This only moves the problem to elsewhere! The Latest on Extra-terrestrial Origins The Raelians Raelians believe that humanity was created from the DNA of superior alien scientists Follow the teachings of a former French magazine sportswriter and wannabe race-car driver Claude Vorilhon, 56. He took the name "Rael" after he claimed a close encounter of the third kind.
6 Origin of Life: Current Theory Chemical Evolution...The idea that long ago complex collections of chemicals formed the first cells. Life began in the oceans 4 bya from simple chemicals joining together in a primordial soup Complex chemicals evolved into living cells What were the conditions like on Earth when life arose? Up to about 4 bya, asteroid impacts and volcanic eruptions resulted in the release of various gases that began to form an atmosphere It consisted mainly of CO 2, with some nitrogen, water vapor and sulfur gases; hydrogen quickly escaped into space CO 2 in the atmosphere trapped solar radiation, making the Earth s surface rather warm Earth was cool enough to form a crust, and water vapor condensed to form oceans Oceans in turn helped to dissolve CO 2 from the atmosphere and deposit it into carbonate rocks on the seafloor What were the conditions like on Earth when life arose? Organic molecules were undoubtedly being formed on the Earth s surface Lightening and ultraviolet radiation from the Sun acted on the atmosphere to forms small traces of many different gases, including ammonia (NH 3 ), methane (CH 4 ), carbon monoxide (CO) and ethane The possible origin of organic molecules a the Stanley Miller experiment Also, cyanide (HCN) probably formed easily in the upper atmosphere, from solar radiation and then dissolved in raindrops What is the simplest living cell that one can imagine? A universal minimal cell must contain the following:: Cell membrane Cytoplasm DNA and RNA Proteins Enzymes Ribozymes More circumstantial evidence accumulated Astronomers found simple organic compounds in meteorites They were convinced that Earth s initial atmosphere could not have matched Oparin-Haldane s model
7 More circumstantial evidence Fossils of ancient bacteria (3.5 billion years old) were found in Australia Suggested life may have evolved rapidly in less than a billion years What are the possible scenarios? When ocean tidal pool evaporates Salts get highly concentrated Could have happened in ancient oceans Concentrating aminos, may allow protein to form Phospholipids arrange themselves into bubbles Chemicals could be concentrated in bubbles (might contain protein, etc.) These bubbles would persist aided by natural selection If they burst, spew contents into air where other reactions occur Over hundreds of millions of years, similar processes could have filled oceans with proteins, carbohydrates, phospholipids, nucleotides Phospholipids arrange themselves into bubbles Eventually they reach a level of complexity Called protocells (not living) Still can t reproduce, no DNA Is DNA essential? Scripps Institute, 1993 found small molecules of synthetic RNA that within an hour began making copies of itself & the copies made more copies Then copies began to change - evolveacquiring new chemical characteristics, but not alive Is DNA essential? Protocells might qualify as the first cells if they have RNA that: Can make copies of itself & evolve Could synthesize enzymes capable of breaking down other organic compounds Could synthesize enzymes capable of building and maintaining cell membranes Later DNA could have evolved as method of conveniently & safely Storing vital chemical info contained in cell RNA
8 The First Cells Age of microbes 3.5 billion years ago 1. The earliest living cells anaerobic prokaryotes 2. Photosynthetic bacteria and the evolution of an oxygen-rich environment 3. Development of aerobic metabolism II. The first cells The rise of eukaryotes about 1.4 billion years ago 1. Anaerobic, predatory prokaryotic cell engulfs an aerobic bacterium. aerobic bacterium 2. Descendants of engulfed bacterium evolve into mitochondria. 1. Endosymbiotic hypothesis 2. The origin of the nucleus 3. Mitochondria-containing cell engulfs a photosynthetic bacterium. 4. Descendants of photosynthetic bacterium evolve into chloroplasts. First Cell Types Heterotrophic cells Incapable of producing their own food Autotrophs Can produce chemicals to store energy Chemoautotrophs Store energy found in certain inorganic chemicals
9 First Cell Types Most organisms found free oxygen intolerable In oceans Organisms that built simple and complex organic compounds Removed CO 2 from the atmosphere More advanced autotrophs removed most of the rest & replaced it with oxygen The excess oxygen changed forever chemical nature of atmosphere to today s Further Evolution of First Cells First cells, prokaryotes, were always simple in structure billion years ago A new cell appeared eukaryotes Had membranes to isolate certain chemical reactions Cellular life then evolved into what we know today Archaea & Bacteria Domains Directly related to oldest organisms on earth Have had lots of time to evolve & differentiate Thrive nearly everywhere Depths of oceans & Earth, all surfaces Multicellular organisms A. Advantages of multicellularity B. Challenges of multicellularity C. The first multicellular organisms 1. Plants primitive marine algae 2. Animals marine invertebrates D. The transition to land 1. Advantages of terrestrial living 2. Challenges of terrestrial living III. Multicellular organisms III. Multicellular organisms The transition to land The evolution of land plants a. The first land plants 1) Mosses and ferns 2) Continued water dependency b. Conifers the invasion of dry habitats c. Flowering plants 1) The dominant plant form today 2) Pollination by insects D. The transition to land The evolution of terrestrial animals a. Arthropods b. Lobefin fish to amphibians c. Amphibians to reptiles 1) The age of the dinosaurs 2) Reptiles and maintenance of body temperature d. Birds 1) Insulating feathers retain body heat 2) Evolution of feathers for flight
10 III. Multicellular organisms The evolution of terrestrial animals e. Mammals 1) Insulating hair retains body heat 2) Live births and mammary glands Era Paleozoic Mesozoic Cenozoic Period Quaternary Tertiary Cretaceous Jurassic Triassic Permian Carboniferous Devonian Silurian Millions of years ago Today Bar width represents relative number of living species Species and families experiencing mass extinction Current extinction crisis caused by human activities. Many species are expected to become extinct within the next years. Cretaceous: up to 80% of ruling reptiles (dinosaurs); many marine species including many foraminiferans and mollusks. Triassic: 35% of animal families, including many reptiles and marine mollusks. Permian: 90% of animal families, including over 95% of marine species; many trees, amphibians, most bryozoans and brachiopods, all trilobites. Devonian: 30% of animal families, including agnathan and placoderm fishes and many trilobites. Ordovician Cambrian 500 Ordovician: 50% of animal families, including many trilobites IV. Human evolution H.habilis H.sapiens A. Primate evolution 1. Grasping hands precision grip and power grip Australopithecus afarensis Homo ergaster A. robustus H. erectus H. heidelbergensis H. neanderthalensis 2. Binocular and color vision with overlapping fields of view Ardipithecus ramidus A. africanus 3. Large brain allows fairly complex social systems A. boisei IV. Human evolution Hominid evolution 1. The evolution of dryopithecines between 20 and 30 million years ago 2. Australopithecines the first true hominids a. Appeared 4 million years ago as evidenced by fossils b. Walked upright c. Large brains IV. Human evolution 3. Homo habilis 2 million years ago a. Larger body and brain b. Ability to make crude stone and bone tools 4. Homo erectus 1.8 million years ago a. Face of modern human b. More socially advanced c. Sophisticated stone tools aided in hunting d. Used fire
11 IV. Human evolution 5. Homo sapiens 200,000 years ago a. Neanderthals evolved 100,000 years ago 1) Similar to humans muscular, fully erect, dexterous, large brains 2) Developed ritualistic burial ceremonies b. Cro-Magnons evolved 90,000 years ago 1) Direct descendants of modern humans 2) Were artistic and made precision tools
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