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bio 1350

bio 1350

Description


○ How do we know this?




• Where does the diversity of life come from?




• What do all living things have in common?



Welcome to Introductory Biology  Wednesday,  January 25, 2017 10:24 AM• TA information  ○ Erin Stephens  ○ Eas437@cornell.edu  • Grade Distribution ○ Exams (85% of Grade) ▪ 3 Prelims (1/4 each) and 1 final (1/4) ▪ 2 Best Prelims (1/4 each) and 1 Final (1/2) ○ No make-up exams ○ Exams will cover material in lectures and sections ○ Final exam covers theIf you want to learn more check out econ1120
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entire course ○ Participation (15% of grade) ▪ Discussion (14%) ▪ Lecture Participation (1%) • Office Hours ○ TA office Hours ▪ Andrew Gipson □ Fridays 12:30-1:30 □ 107 Stimson Hall ○ Instructor Office Hours ▪ Tony Bratscher □ Thursdays 2:30-4:00 (and 5:00-6:00 by appointment) □ 257 Weill Hall ▪ Maria Garcia □ Thursday 3:30-5:00 pm □ 202 Biotech Building • What do all living things have in common? ○ Living things: ▪ Utilize materials and energy ▪ Grow and develop ▪ Respond tot heir environment ▪ Reproduce and pass their traits to offspring ▪ Evolve (change slowly) in response to their environment ▪ Are made of cells • Early Biologists Robert Hooke (1635-1703) was looking through a microscope on a piece  ○ of cork and saw things that looked like jail cells. He coined the term cell.         ▪ Evolve (change slowly) in response to their environment ▪ Are made of cells • Early Biologists Robert Hooke (1635-1703) was looking through a microscope on a piece  ○ of cork and saw things that looked like jail cells. He coined the term cell. Leewenhook (1623-1732) built over 200 microscopes and was the first  ○ person to observe single living cells. Martthias Schleiden and Theodor Schwann discovered that cells are the  ○ universal building blocks of all living tissues. ○ Louis Pasteur discovered that all cells arise from pre-existing cells. Made an experiment with flasks to understand how bacteria in a  ▪ flask develop • Where does the diversity of life come from? ○ Theory of Evolution - 1838 ○ Charles Darwin was studying the Galapagos Islands All species are derived from variants of earlier  species by selection of the  ○ fittest. • All life has a common origin ○ It started about 3 billion years ago ○ How do we know this? ▪ DNA sequences of all organisms are related ▪ The basic chemistry of all cells is similar ▪ The fundamental processes are similar ○ Implication of this fact What you learn about one type of cell will likely be true in other  ▪ cell  types. • Why is it important to learn about cells? ○ Curiosity ▪ What are cells made of? ▪ How do they function? ▪ How do new cells arise from pre-existing cells? How can we grow from a single cell to an animal with 200 different  ▪ cell  types? • All diseases results from altered cell  function ○ Hereditary Diseases ○ Environmental Diseases ○ Pathogenic Diseases • Three Major Topics ○ What is the molecular composition of cells? ○ What is the internal organization of cells? ○ How are cells  propagated? • Second Part of the Course○ Cells do not exist in isolation ○ What is the molecular composition of cells? ○ What is the internal organization of cells? ○ How are cells  propagated? • Second Part of the Course○ Cells do not exist in isolation ○ Unicellular Organisms use cell  signaling to: ▪ Interact with their environment ▪ Are part of communities Multicellular Organisms use signaling to coordinate cell behaviors  ○ and regulate gene expression to generate different types of cells that  perform different functions. ○ Multicellular  organisms originate from just one cell ▪ Sexual reproduction ▪ Meiosis ▪ Inheritance ▪ Fertilization

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