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4. The difference between an atom and and element is
a. an element is made of atoms
b. atoms are made of elements
c. atoms are held together by covalent bonds
d. none of the above

6. Which of the following is NOT an organic compound?
a. ATP molecule
b. saturated fatty acid
c. monosaccharide
d. ammonia
not sure...

7. Carbohydrates and lipids have many carbon-hydrogen bonds; therefore they both
a. store energy in these bonds
b. are easily dissolved in water
c. dissolve only in vinegar
d. exist only in cells of plants

8. All organic compounds contain the element
a. carbon
b. nitrogen
c. calcium
d. sodium


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