Unit 2: Biochemistry TEST

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• 2
• 4
• 5
• 7

1. What is the name of the weaker bond that attaches one water molecule to another water molecule (represented by a dotted line)?

• Covalent
• Ionic
• Hydrogen
• Peptide

2. A nitrogen base, phosphate group, and a sugar make up a what?

• lipid
• nucleotide
• carbohydrate
• protein

3. Chemical reactions are necessary to support life processes. Which of the following is most important to provide a media (environment) for chemical reactions?

• water
• air
• fats
• nucleic acids

4. Carbon compounds that come from living organisms are called __________________ compounds.

• water
• homogeneous
• organic
• biological

5. The nucleus of an atom contains ______.

• protons and neutrons
• neutrons and electrons
• protons and electrons
• protons, neutrons, and electrons

6. What are the basic building blocks (monomers) of proteins?

• nucleic acids
• amino acids
• peptide bonds
• glycerol and fatty acids

7. Which of the following are nonpolar (will not dissolve in water) molecules?

• carbohydrates
• proteins
• lipids
• Both carbohydrates and proteins

8. Enzymes:

• Are used up in a reaction
• are specific for a specific reaction
• Are not sensitive to temperature
• all of the options are correct