Life as We Know It

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_____O____ 1. oxygen
______C___ 2. carbon
______K___ 3. potassium
_____I____ 4. iodine
______H___ 5. hydrogen
_____N____ 6. nitrogen
_____Ca____ 7. calcium
_____Na____ 8. sodium
_____P____ 9. phosphorus
______Mg___ 10. magnesium
______Cl___ 11. chloride
____Fe_____ 12. iron

In the space below, list the chemicals (above) from the MOST abundant in the human body to the LEAST abundant.

1. Oxygen
2. Carbon
3. Hydrogen
4. Nitrogen
5. Calcium
6. Phosphorus
7. Potassium
8. Sodium
9. Chloride
10. Magnesium
11. Iodine
12. Iron
. Bases are substances that (release/accept) hydrogen ions.

9. The bicarbonate ion is an important (acid/base) in the human body.

10. Because water molecules have a positive pole and a negative pole, we consider the water molecule to be a ___Polar___ molecule.

11. Water molecules bond with other water molecules by a weak ___Hydrogen___ bond.

12. _____Buffers_____ are substances that resist abrupt and large swings in the pH of body fluids by releasing hydrogen ions when the pH starts to (rise/drop) and by binding hydrogen ions when the pH starts to (rise/drop). Using the words below, identify the indicated areas of the pH scale:

acidic basicneutral

A. _____________

B. _____________

C. _____________

Using the choices below, describe the substances listed.

A. acidB. baseC. neutral

_______1. bile

_______2. blood

______ 3. vinegar

_______4. distilled water

_______ 5. sodium hydroxide

_______ 6. urine

_______ 7. saliva

_______ 8. bicarbonate

_______ 9. gastric juice

_______ 10. carbonic acid

List the four categories of organic compounds found in humans.

All organic compounds that occur in humans contain __________________.

Match the items below to the descriptions:

A. amino acids
B. carbohydrates
C. lipids
D. fatty acids
E. glycerol
F. nucleotides
G. monosaccharides
H. proteins

_____1. Building...
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