BIO%20101%20Lec%20-%20Chapter%202

BIO%20101%20Lec%20-%20Chapter%202 - Chapter 2 SDM, 1/2008...

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Chapter 2 SDM, 1/2008
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Labs start the week of January 28th! Check the day and time that your first lab meets Buy the lab manual before your first meeting No used copies allowed in lab Students that do not attend the first lab will receive a grade  of zero There are no “make-up” labs and the first lab grade can not  be dropped Wear appropriate foot wear
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Defining science (revisited)  Science is a process  Biology is the study of life  Biology is challenging because   it is a multidisciplinary science   and living systems are complex
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“If I could remember the names of  these particles, I would have been  a botanist.” Enrico Fermi
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The atomic theory  Describes the nature of matter  All matter consists of atoms  Applied to common phases of   matter (i.e., solids, liquids, and   gases) on Earth
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What are atoms?  Smallest particles that retain   properties of an element  Made up of many types of   subatomic particles Electrons Protons Neutrons
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Subatomic particles  Electrons (e-) carry a negative   charge  Protons (p+) carry a positive    charge  Neutrons are just that…neutral!
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Subatomic particles (cont.)  Electrons occupy space around   the atom’s center  The nucleus is comprised of    protons and neutrons  Location of these particles is    not as simple as described!
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S ubato m ic  partic le s  (c o nt.) s he ll m o de l b a ll m o de l e le c tro n c lo ud proton electron (hydrogen atoms)
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Ato m ic  num be r  Eq ua ls  the  num b e r o f pro to ns  (a nd   e le c tro ns  in a to m s  with no  c ha rg e )  All a to m s  o f a  g ive n e le m e nt ha ve   the  s a m e  a to m ic  num b e r  Fo r e xa m ple , c a rb o n ( 6 C ) ha s  a n   a to m ic  num b e r o f 6
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Mas s  num be r and is o to pe s  Eq ua ls  the  num b e r o f pro to ns   plus  the  num b e r o f ne utro ns    Is o to pe s  va ry in the  a m o unt o f   ne utro ns  the y po s s e s s  Fo r e xa m ple , 12C  a nd 14C  ha ve  a   to ta l o f 6 a nd 8 ne utro ns     re s pe c tive ly
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Radioisotopes  Have an unstable nucleus that   emits energy and particles   Radioactive decay transforms   the isotope into another element  This decay occurs at a fixed (and   observable) rate
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Radioisotopes in biology  Useful in dating materials   Useful in food production  Useful in studying the metabolism   of various organisms
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Radioisotopes as tracers  Tracer is a substance   with a radioisotope  Emissions from radio-   isotope detected  Following movement of   tracers is useful in many   fields of biology
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BIO%20101%20Lec%20-%20Chapter%202 - Chapter 2 SDM, 1/2008...

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