biological molecules (chapter 1)

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Author:
shan97
ID:
308383
Filename:
biological molecules (chapter 1)
Updated:
2015-09-23 10:38:22
Tags:
biology
Folders:
biology
Description:
biological molecules and structures
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  1. water
    • composed of oxygen atom and two hydrogen atom
    • at angle 104.5°
    • hydrogen atoms shares a pair of electron with oxygen atom to form two covalent bond
  2. bipolar
    • molecules with charged regions
    • due to an uneven charge distribution within molecules
    • oxygen is slightly negatively charged and hydrogen is slightly positively charged
  3. hydrogen bonds
    • makes water molecules sticky
    • arranged themselves
    • positively charged hydrogen of another water molecule will attracted to negatively charged oxygen atom of another water molecules
    • water molecules can form 4 hydrogen bonds with 4 other water molecules:
    • constantly formed,broken and reformed
    • water molecules form a strong force collective and makes a stable compound
  4. universal solvent
    • ionic substances:
    • salts,NaCl
    • polar substances:
    • sugar
    • substances have electrostatic charges, which are attracted to the charges on water molecules due to their bipolar nature

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