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- 1. Multiple Choice
Which describes a substance that is made up of only one kind of atom and cannot be broken down by chemical reactions?
element
electron
carbohydrate
molecule
- 2. Multiple Choice
Which substance is an example of a carbohydrate?
DNA
wax
enzyme
sugar
- 3. Multiple Choice
RNA is an example of a(n)
lipid.
nucleic acid.
carbohydrate.
protein.
- 4. Multiple Choice
What organic molecule stores the greatest amount of energy?
carbohydrate.
nucleic acid.
lipid.
protein.
- 5. Multiple Choice
Which formula is an example of an organic compound?
NO₂
C₆H₁₂O₆
O₂
H₂O
- 6. Multiple Choice
Proteins are long molecules that are built from various combinations of
nucleotides.
lipids.
amino acids.
carbohydrates
- 7. Multiple Choice
An animal's stomach contains enzymes that break down food into smaller molecules that the animal's cells can use. Enzymes perform this function by
increasing the temperature.
changing the ionic concentration.
lowering the pH.
lowering the activation energy.
- 8. Multiple Choice
A spider is able to walk on water without sinking due to water's
surface tension.
specific heat
ionic concentration.
solvency.
- 9. Multiple Choice
A substance with a pH of 6 is called
a base.
an acid.
both an acid and a base.
neither an acid nor a base.
- 10. Multiple Choice
Isotopes are atoms of the same element with the same number of protons and
the same number of neutrons.
a different number of neutrons.
a different number of molecules.
a different number of electrons.
- 11. Multiple Choice
Amino acid is to protein as
DNA is to RNA.
simple sugar is to starch.
fat is to lipid.
sugar is to fat.
- 12. Multiple Choice
Which of the following organic compounds is the main source of energy for living things?
proteins
nucleic acids
lipids
carbohydrates
- 13. Multiple Choice
An example of a monosaccharide is ________.
starch
cellulose
sucrose
glucose
- 14. Multiple Choice
Cellulose and starch are examples of:
proteins
lipids
monosaccharides
polysaccharides
- 15. Multiple Choice
Monomers chemically connect together to form
polymers.
diomers.
water
monosaccharides
- 16. Multiple Choice
The building blocks of nucleic acids are ________.
nucleotides
amino acids
fatty acids
monosaccharides
- 17. Multiple Choice
Nucleic acids differ from proteins because nucleic acids contain the element
phosphorous.
nitrogen.
oxygen.
carbon.
- 18. Multiple Choice
The element that is the basis of all living things is
oxygen.
carbon.
nitrogen.
phosphorous.
- 19. Multiple Choice
The smallest unit of matter is the
molecule.
compound.
atom.
covalent bond.
- 20. Multiple Choice
What chemical is referred to as the universal solvent?
hydrochloric acid
carbon dioxide
ethanol
water
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