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Lecture 3

BIOLOGY LECTURE 3 - ORIGINS.doc

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Department
Biology
Course
Biology 1001A
Professor
Beth Mac Dougall- Shackleton
Semester
Fall

Description
Biology Lecture 3: Origins Independent STUDY Outcomes 1. What are the characteristics shared by all life (7 of them)? I. Display Order - all forms of life are arranged in a highly ordered manner, with the cell being the fundamental unit of life. II. Harness and Utilize Energy - all forms of life acquire energy from the environment and use it to maintain their highly ordered state. III. Reproduce - all organisms have the ability to make more of their own kind. IV. Respond to Stimuli - organisms can make adjustments to their structure, function, and behaviour in response to changes to the external environment (Aplant can adjust the size of its pores (its stomata) on the surface of its leaves to regulate gas exchange). V. Exhibit Homeostasis - organisms are able to regulate their internal environment such that conditions remain relatively constant (Sweating is on way in which the human body attempts to remove heat and thereby maintain a constant temperature). VI. Growth and Development -All organisms increase their size by increasing the size and/or number of cells. Many organisms also change over time. VII. Evolve - populations of living organisms change over the course of generations to become better adapted to their environment. 2. In what way are properties of life considered “emergent”? - Properties, like the 7 characteristics of life, are considered emergent because they come about or emerge from many simpler interactions that, in themselves, do not have the properties found at the higher levels. - An emerged ability is one that emerges from many interactions that are at a lower level 3. The characteristics of the “habitable zone” of a solar system. - region around star where water would exist in a liquid state - water would thus be conductive to the development of life - distance from the star where the occurs varies upon energy output of the star 4. The conditions of a primitive Earth. - atmosphere of Earth 4 billion years ago was very different (primordial atmosphere) - primordial atmosphere contained an abundance of water vapour - large quantities of H2, CO2, NH3 (ammonia), CH4 (methane) - it was proposed that organic molecules could have formed in the atmosphere of primordial Earth - the early atmosphere was considered to be a reducing atmosphere because of the presence of large concentrations of molecules such as hydrogen, methane and ammonia - these molecules contain lot of e- and and many reactions would of taken place which would have led to the creation of more complex organic molecules - no ozone O3 - complete absence of O2 Biology Lecture 3: Origins 5. The types of molecules that were, and were not, synthesized by the Miller- Urey experiment. - The types of molecules that were synthesized were: alcohol, aldehydes and other organic acids, amino acids 6. The importance of liposomes in evolution of first cells. - lipids were needed for the formation of the membrane-defined compartment - this compartment would allow for primitive metabolic reactions to take place in an envi- ronment that is distinctly different than the external surroundings - a liposome is a lipid vesicle in which the lipid molecules form a bilayer very similar to a cell membrane - liposomes are selectively permeable (ability to transmit fluids) - liposomes can swell and contract depending on the osmotic (net movement of solvent molecules) conditions of their environment 7. Characteristics of mimi-virus that suggests it should be considered alive - the fact that it can get more sick makes it more alive - mimivirus can fall ill through infection by another virus 8. Characteristics of virophage - much like the bacteriophage viruses that infect bacteria - virophages infect viral factories - does what a parasite does which is exploiting its host for its own replication - Sputnik is a virophage which only contains 21 genes LECTURE Outcomes 1. The age of the Earth. - 4.6 billion years old 2. The age of start of life on Earth. - 4.0 billion years ago 3. The domains of life. - Bacteria - Archaea - Euk
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