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BIOA02H3 (533)
Lecture

lecture 3

2 Pages
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Department
Biological Sciences
Course Code
BIOA02H3
Professor
Mary Olaveson

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-life like all other matter is identified similar to all other elements on the periodic table
-6 highlighted elements represent 98% of what life is made off
- minerals are required to function along with vitamins
-radioisotopes are result of an incline or decline in neutrons
-exciting electrons causes the use of energy, atom holds it, otherwise would be lost, but in
this case the energy falls back into a stable orbit
- A molecule is a substance consisting of 2 or more atoms bonding together through ha
chemical reaction, or it can also be oxygen, O+O=MOLECULE
-sodium and chloride alone are known to be toxic, but together produce sodium chloride
which is non-toxic
- table 2.1*memorize
-bonding tyo form moleculeswithin...between
-Covalent bonds are the strongest seen within biology
-larger the element, towards the bottom of the periodsic table you get a lower
electronegativity, as well as leftright
-most important electronegative element on the periodic table is oxygen
-electronegativity depends ont he number of positive charges and the distance between the
Non-polar covalent bonds occur when the electronegativity of the atoms are similar (i.e.
equal) and polar covalent bonds occur when the electronegatvity so the two atoms involved
are different (i.e. unequal) and are reactive because of the polarity of the molecule.
-10 times less strong then the covalent bonds are the ionic bonds
- the environment effects the ionic bonds (covalent stronger then ionic bonds because of
water, ions in water)
- Third bond with similar strength to the ionic bonds are the hydrogen bonds, which occur
between molecules, while ionic is within molecules
-AMINO GROUPS ARE FUNTIONAL GROUPS WITH POSITIVE CHARGES
-Chemical receptors within cells to recognize molecules, i.e. toxins, etc
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Description
-life like all other matter is identified similar to all other elements on the periodic table -6 highlighted elements represent 98% of what life is made off - minerals are required to function along with vitamins -radioisotopes are result of an incline or decline in neutrons -exciting electrons causes the use of energy, atom holds it, otherwise would be lost, but in this case the energy falls back into a stable orbit - A molecule is a substance consisting of 2 or more atoms bonding together through ha chemical reaction, or it can also be oxygen, O+O=MOLECULE -sodium and chloride alone are known to be toxic, but together produce sodium chloride which is non-toxic - table 2.1*memorize -bonding tyo form moleculeswithin...between -Covalent bonds are the strongest seen within biology -larger the element, towards the bottom of the periodsic table you get a lower electronegativity, as well as leftright -most impor
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