Unit 2: Chemistry in Biology

Why is the electron transport chain an aerobic process?

• The electron transport chain does not utilize oxygen in its steps.
• The electron transport chain produces carbon dioxide in its steps.
• The electron transport chain does not produce carbon dioxide in its steps.
• The electron transport chain utilizes oxygen in its steps.

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What is the importance of NADH and FADH2?

• These molecules are used as products in photosynthesis.
• These molecules are used in the electron transport chain.
• These molecules are recycled for use in glycolysis.
• These molecules are useless by-products.

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In cellular respiration, which of the following are reactants? Select all that apply.

• H2O
• O2
• CO2
• energy
• C6H12O6

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Which process does not occur in the mitochondria?

• electron transport chain
• preparatory reaction
• glycolysis
• Krebs cycle

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Which of the following compounds can be classified as a proteins?

• polysaccharides
• fatty acids
• enzymes
• nucleic acids

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Which biological macromolecule is not considered a polymer?

• a nucleic acid
• a protein
• a lipid
• a carbohydrate

What are the major classes of biological macromolecules?

Which statement is true of chemical equations?

• Reactants and products come before the arrow.
• Reactants come before the arrow, products come after.
• Reactants come before the arrow, products come after.
• Reactants and products both come after the arrow.

Which of the following statements is true?

• All compounds are molecules.
• All molecules are compounds.
• Molecules are made up of ionic bonds.
• Compounds are only composed of covalent bonds.

In photosynthesis, which of the following are products? Select all that apply.

• energy
• CO2
• O2
• C6H12O6
• H2O

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