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Biology - 253
Unit 1B Biochemistry
Topics:
1.1
1.2
1.3
1.4
Nature of Matter
Properties of Water
Carbon Compounds and Reactions
Parts of a Food Chain
Key Terms: 1.1
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atom
nucleus
electron
element
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isotope
compound
ionic bond
ion
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covalent bond
molecule
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solution
solute
solvent
suspension
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pH scale
acid
base
buffer
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nucleotide
protein
amino acid
chemical reaction
reactant
product
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activation energy
catalyst
enzyme
substrate
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chemosynthesis
heterotroph
consumer
carnivore
herbivore
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scavenger
omnivore
decomposer
detritivore
Key Terms: 1.2
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hydrogen bond
cohesion
adhesion
mixture
Key Terms: 1.3
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monomer
polymer
carbohydrate
monosaccharide
lipid
nucleic acid
Key Terms: 1.4
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food chain
trophic level
autotroph
producer
photosynthesis
Bio-253/Unit 1 Outline/Biochemistry (08/14)
Supplementary Questions
Section 1.1 Nature of Matter
1. Which particles of an atom make up the nucleus?
2. Why do all isotopes of the same atom have similar characteristics?
3. Write the correct isotope notation for:
a. an atom with 12 protons and 13 neutrons.
b. an ion with 7 protons, 8 neutrons, and 10 electrons.
4. How does and element differ from a compound?
5. Compare and contrast an ionic bond and a covalent bond.
Section 1.2
Properties of Water
1. What does it mean when a molecule is said to be polar?
2. What is a hydrogen bond?
3. Describe some properties of water?
4. Why does water make a good solvent?
5. How does a mixture differ from a compound?
6. How does an acid differ from a base?
Section 1.3
Carbon Compounds and Reactions
1. What properties of carbon explain carbon’s ability to form different large and complex structures?
2. Describe at least one function of each group of organic compounds?
3. Why are proteins considered polymers but lipids are not?
4. What are the components of a nucleotide?
5. How does an enzyme affect a chemical reaction?
Section 1.4 Parts of a Food Chain
1. What are the two primary sources of energy that power living systems?
2. Explain how consumers obtain energy?
3. Describe how energy flows in a “one-way stream” through an ecosystem?
4. On average, what proportion of the energy in an ecosystem is transferred from one trophic
level to the next? Where does the rest of the energy go?
5. Draw an energy pyramid for a five-step food chain. If 100 percent of the energy is available
for the first trophic level, what percentage of that energy is available at the highest trophic
level?