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Questions and Answers
What is the main difference between the theories of evolution proposed by Lamarck and Darwin?
What is the main difference between the theories of evolution proposed by Lamarck and Darwin?
Based on the geological time scale, which period saw the emergence of land colonization by organisms?
Based on the geological time scale, which period saw the emergence of land colonization by organisms?
What was the primary observation that Darwin made about the finches on the Galapagos Islands that contributed to the development of his theory of evolution?
What was the primary observation that Darwin made about the finches on the Galapagos Islands that contributed to the development of his theory of evolution?
How does the concept of uniformitarianism, as proposed by geologists in the 1800s, support Darwin's theory of evolution?
How does the concept of uniformitarianism, as proposed by geologists in the 1800s, support Darwin's theory of evolution?
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What key difference between the theories of Lamarck and Darwin explains the differences in the evolution of the Galapagos finches?
What key difference between the theories of Lamarck and Darwin explains the differences in the evolution of the Galapagos finches?
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Which of the following hypotheses proposes that organic molecules were delivered to Earth from space?
Which of the following hypotheses proposes that organic molecules were delivered to Earth from space?
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Which of the following is NOT a characteristic that distinguishes life from non-life?
Which of the following is NOT a characteristic that distinguishes life from non-life?
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In the context of the early Earth, what does the term 'prebiotic soup' refer to?
In the context of the early Earth, what does the term 'prebiotic soup' refer to?
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Which stage in the origins of life involves the formation of DNA, RNA, and proteins from smaller molecules?
Which stage in the origins of life involves the formation of DNA, RNA, and proteins from smaller molecules?
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Why is the Miller-Urey experiment considered significant in understanding the origins of life?
Why is the Miller-Urey experiment considered significant in understanding the origins of life?
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What is the primary reason for using maggots in maggot therapy for non-healing wounds?
What is the primary reason for using maggots in maggot therapy for non-healing wounds?
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Which of the following correctly orders the eras in Earth's history from oldest to youngest?
Which of the following correctly orders the eras in Earth's history from oldest to youngest?
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Which period is characterized by the first appearance of seed plants?
Which period is characterized by the first appearance of seed plants?
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During which period did a mass extinction event eliminate more than 60% of marine invertebrate species?
During which period did a mass extinction event eliminate more than 60% of marine invertebrate species?
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What significant geological event occurred during the Permian period?
What significant geological event occurred during the Permian period?
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The evolution of which adaptation allowed reptiles to thrive in diverse environments?
The evolution of which adaptation allowed reptiles to thrive in diverse environments?
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Which period witnessed the largest known mass extinction event?
Which period witnessed the largest known mass extinction event?
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The emergence of "first vertebrates" is associated with which period?
The emergence of "first vertebrates" is associated with which period?
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What is the primary reason for the extensive coal deposits formed during the Carboniferous period?
What is the primary reason for the extensive coal deposits formed during the Carboniferous period?
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Which period is characterized by the dominance of amphibians and the emergence of reptiles?
Which period is characterized by the dominance of amphibians and the emergence of reptiles?
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What event marked the end of the Triassic period?
What event marked the end of the Triassic period?
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Which of the following describes the dominant land plants during the Jurassic period?
Which of the following describes the dominant land plants during the Jurassic period?
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What critical role do clay surfaces play in the transition from prebiotic monomers to biological polymers?
What critical role do clay surfaces play in the transition from prebiotic monomers to biological polymers?
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What makes RNA a strong candidate for the first genetic material in early life forms?
What makes RNA a strong candidate for the first genetic material in early life forms?
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Which of the following statements best describes the evolutionary advantage of the transition from a hypothetical RNA world to a DNA-RNA-protein world?
Which of the following statements best describes the evolutionary advantage of the transition from a hypothetical RNA world to a DNA-RNA-protein world?
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What is the primary difference between the processes that contribute to the formation of coacervates and liposomes?
What is the primary difference between the processes that contribute to the formation of coacervates and liposomes?
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What is the significance of the protobiont's ability to self-replicate in the context of the origins of life?
What is the significance of the protobiont's ability to self-replicate in the context of the origins of life?
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What role do ribozymes play in the transition from a hypothetical RNA world to protein-based life?
What role do ribozymes play in the transition from a hypothetical RNA world to protein-based life?
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Why is DNA considered a more stable and reliable storage molecule for genetic information compared to RNA?
Why is DNA considered a more stable and reliable storage molecule for genetic information compared to RNA?
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Which of the following is NOT a characteristic that distinguishes protobionts from truly living cells?
Which of the following is NOT a characteristic that distinguishes protobionts from truly living cells?
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Which of the following best describes the role of lipids in the formation of protobionts and their potential relevance to the evolution of life?
Which of the following best describes the role of lipids in the formation of protobionts and their potential relevance to the evolution of life?
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What is the primary reason why stromatolites are significant in the study of early life?
What is the primary reason why stromatolites are significant in the study of early life?
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Which of the following statements accurately describes the relationship between igneous rocks and the dating of rock layers?
Which of the following statements accurately describes the relationship between igneous rocks and the dating of rock layers?
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Which of the following is NOT a consequence of environmental changes on living organisms?
Which of the following is NOT a consequence of environmental changes on living organisms?
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Which of the following statements is FALSE regarding the evolution of multicellularity?
Which of the following statements is FALSE regarding the evolution of multicellularity?
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Based on the provided information, in which time period did the first prokaryotic cells emerge?
Based on the provided information, in which time period did the first prokaryotic cells emerge?
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What is the fundamental difference between heterotrophs and autotrophs, as discussed in the context of early life?
What is the fundamental difference between heterotrophs and autotrophs, as discussed in the context of early life?
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What is the significance of the emergence of eukaryotic cells in the evolution of life?
What is the significance of the emergence of eukaryotic cells in the evolution of life?
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What is the primary evidence for the endosymbiotic theory, which explains the origin of eukaryotic cells?
What is the primary evidence for the endosymbiotic theory, which explains the origin of eukaryotic cells?
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Which of the following is NOT a characteristic of the Proterozoic Eon?
Which of the following is NOT a characteristic of the Proterozoic Eon?
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What is the significance of bilateral symmetry in the evolution of animals?
What is the significance of bilateral symmetry in the evolution of animals?
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Flashcards
Myiasis
Myiasis
Invasion of tissue by fly larvae (maggots) that feed on living or dead tissue.
Facultative Myiasis
Facultative Myiasis
Maggots develop in foul-smelling wounds, especially those producing pus.
Maggot Therapy
Maggot Therapy
The introduction of live, disinfected maggots into non-healing wounds for debridement.
History of Earth
History of Earth
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What is Life?
What is Life?
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Origins of Life - Stages 1-4
Origins of Life - Stages 1-4
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Reducing Atmosphere Hypothesis
Reducing Atmosphere Hypothesis
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Deep-sea Vent Hypothesis
Deep-sea Vent Hypothesis
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Prebiotic Polymer Synthesis
Prebiotic Polymer Synthesis
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Clay Surfaces
Clay Surfaces
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Protobionts
Protobionts
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Coacervates
Coacervates
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Liposomes
Liposomes
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RNA World
RNA World
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Functions of RNA
Functions of RNA
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Advantages of DNA/RNA
Advantages of DNA/RNA
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K-T Extinction
K-T Extinction
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Angiosperms
Angiosperms
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Microevolution
Microevolution
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Macroevolution
Macroevolution
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Darwin's Observations
Darwin's Observations
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Sedimentary Rock
Sedimentary Rock
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Igneous Rock
Igneous Rock
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Metamorphic Rock
Metamorphic Rock
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Stromatolites
Stromatolites
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Archaean Period
Archaean Period
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Proterozoic Period
Proterozoic Period
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Eukaryotic cells
Eukaryotic cells
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Autotrophs
Autotrophs
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Heterotrophs
Heterotrophs
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Endosymbiotic Theory
Endosymbiotic Theory
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Phanerozoic Eon
Phanerozoic Eon
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Cambrian Explosion
Cambrian Explosion
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Burgess Shale
Burgess Shale
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Ordovician Extinction
Ordovician Extinction
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Age of Fish
Age of Fish
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Carboniferous Period
Carboniferous Period
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Pangaea
Pangaea
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Great Dying
Great Dying
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Triassic Period
Triassic Period
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Jurassic Period
Jurassic Period
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Study Notes
Myiasis
- Invasion of tissue by fly larvae (maggots)
- Feeding on living or dead tissue
- Facultative myiasis: maggots develop in foul-smelling wounds (especially pus-producing wounds)
- Maggot therapy: live (disinfected) maggots introduced into non-healing wounds to clean out necrotic tissue (debridement)
History of Earth
- Archaen → Proterozoic → Phanerozoic → Cenozoic
- 13.8 billion years ago - Big Bang
- 4.6 billion years ago - Start of solar system
- 4.55 billion years ago - Origin of Earth
- 4 to 3.5 billion years ago - Origins of life (cooling of Earth, formation of crust and oceans)
What is Life?
- DNA, cells, metabolism, adaptation, homeostasis, growth, reproduction and evolution.
- Metabolism:
- Absorption of nutrients.
- Excretion of wastes.
- Energy acquisition and transformation (e.g., Krebs cycle).
- Cellular synthesis.
- Reproduction:
- Growth: duplication of all cellular components.
- Division of discrete units (cells).
- Evolution:
- Variation, reproduction, mutation
- Mutation: mistakes in copying cell components
Origins of Life: Stages 1-4
- Stage 1: Organic molecules (nucleotides and amino acids) produced prior to cells.
- Stage 2: Nucleotides and amino acids polymerized to form DNA, RNA and proteins.
- Stage 3: Polymers enclosed in membranes.
- Stage 4: Polymers enclosed in membranes acquire cellular properties.
Origin of Organic Molecules
- Reducing Atmosphere Hypothesis: Early Earth atmosphere conditions and electrical discharge produced organic compounds.
- Extraterrestrial Hypothesis: Organic compounds delivered to Earth by meteorites.
- Deep Sea Vent Hypothesis: Organic compounds formed in the temperature gradient between extremely hot vent water and cold ocean water.
Stage 2: Organic Polymers
- Experimentally, prebiotic synthesis of polymers (nucleic acids and polypeptides) occurs on clay surfaces. Hydrolysis competes with polymerization in solution.
Stage 3: Formation of Boundaries
- Protobionts (precursors to living cells) form boundaries – aggregate of molecules/macromolecules that maintain an internal chemical environment distinct from the surroundings using lipid bilayers.
RNA World
- RNA is a first macromolecule in protobionts.
- RNA functions in storing information, self-replication and enzyme function.
- Advantages of DNA, RNA, protein world: information storage (DNA), metabolism (proteins).
Origins of Life Summary
- Formation/accumulation of organic molecules.
- Polymerization of nucleic acids & proteins.
- Formation of protobionts
- Synthesis of cell components by ribozymes
- Synthesis of proteins by DNA, RNA, & ribosomes
- Replication of DNA
Fossils and Types of Rock
- Sedimentary rocks contain fossils.
- Igneous rocks are used to date rock layers.
- Radioactive isotopes in rocks allow dating rocks and measure extinct time.
Changes in Living Organisms
- Changes in climate, atmosphere, landmasses, floods etc.
- Living organisms can adapt to changes and allow for new types of organisms.
- Responsible for many extinctions.
Time Periods (Timeline)
- Archaean (3.8-2.5 bya):
- First cells (prokaryotic).
- Anaerobic organisms.
- Heterotrophs (energy from consumption).
- Proterozoic (2.5 bya - 543 mya):
- Multicellular eukaryotes arise.
- Possible origins: colony formation, single cells staying stuck together.
Phanerozoic Eon - Diversification
- Diversification of invertebrates and colonization of land plants and animals.
- Cambrian (543–490 mya):
- Abrupt increase in marine invertebrate diversity
- Ordovician:
- Diverse group of marine invertebrates (trilobites, brachiopods).
- Primitive land plants and arthropods invade land, mass extinction at end.
- Silurian:
- Coral reefs appear.
- Colonization by terrestrial plants and animals (spiders and centipedes).
- Devonian:
- Ferns, horsetails, seed plants appear.
- Insects, tetrapods (amphibians) emerge.
- Carboniferous:
- Rich coal deposits formed.
- Large plants, trees, amphibians present.
- First flying insects.
- Amniotic egg emerges.
- Permian:
- Pangaea (continent formed).
- Amphibians, reptiles became dominant.
- Mammals-like reptiles appeared.
- Triassic:
- Many reptiles.
- First dinosaurs and mammals, gymnosperms (non-flowering plants) dominate.
- Jurassic:
- Gymnosperms dominate.
- Dinosaurs dominate.
- First known birds appear.
- Cretaceous:
- Dinosaurs still dominant, earliest flowering plants (angiosperms).
- Mass extinction at end (K-T extinction).
- Tertiary:
- Mammals diversified rapidly, angiosperms dominate.
Lecture 5 - Introduction to Evolution
- Evolution: Heritable change in one or more characteristics of a population through generations.
- Microevolution: Changes in allele frequencies in a population over time.
- Macroevolution: Formation of new species/groups of related species.
- Theory: Comprehensive explanation for a large body of information.
Darwin's Influences and HMS Beagle
- Uniformitarism: time required for Earth's geological changes.
- Slow geological processes lead to substantial change.
- Population growth linked to limited resources.
- Darwin's observations on animals and plants on his voyage influenced his theory.
Darwin's Formulation of Theory
- Mid-1840s: Darwin formulated his theory.
- 1858: Alfred Wallace also developed similar theory; papers published together.
- 1859: Darwin's "The Origin of Species" published.
Descent with Modification
- Variation within a species; heritable traits.
- More offspring produced than can survive; competition for resources.
- Traits favoring reproductive success become more common.
Fossils (Transitional Forms)
- Fossils document evolutionary changes.
Biogeography
- The study of the geographical distribution of extinct/living species.
- Isolated continents and islands have unique plant and animal communities.
- Convergent evolution: similar characteristics from different lineages.
Selective Breeding (Artificial Selection)
- Programs/procedures to modify traits in domesticated species.
- Breeders chose desirable phenotypes (e.g., leg-length, size, hairiness).
Homology - Anatomical, Developmental, Molecular
- Fundamental similarity due to descent from a common ancestor.
- Similar structures may have different functions.
- Species from different lineages sharing similar structures.
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Description
Test your knowledge on the fundamental differences between Lamarck's and Darwin's theories of evolution, and explore the geological time scale regarding land colonization. Additionally, dive into the concepts that relate to the origins of life, including the prebiotic soup and key stages in biogenesis.