1 Biochemistry Milestone Practice quiz

Which of the following compounds is most likely to be part of living organisms?

• C₆H₁₂O₆

• BF₃

• MoCl₂

• CsI

One category of organic compounds contains molecules composed of long hydrocarbon chains. The hydrocarbon chains may be saturated or unsaturated. Which of the following categories of organic compounds contains these molecules?

• carbohydrates

• lipids

• nucleic acids

• proteins

Most carbohydrates in the human body are

• used as building blocks for proteins

• used as catalysts for reactions in cells

• consumed as a source of energy

• not easily absorbed into the bloodstream

Plants and animals are composed of organic compounds. Which of the following are the common elements found in organic compounds?

• iron, oxygen, nickel, copper

• sodium, potassium, gold, hydrogen

• helium, neon, argon, krypton

• carbon, hydrogen, oxygen, nitrogen

There are many different enzymes located in the cytoplasm of a single cell. How is a specific enzyme able to catalyze a specific reaction?

• Different enzymes are synthesized in specific areas of the cytoplasm.

• Most enzymes can catalyze many different reactions.

• An enzyme binds to a specific substrate (reactant) for the reaction catalyzed.

• Enzymes are transported to specific substrates (reactants) by ribosomes.

Which table correctly compares the DNA, cell shape, and proteins produced by a liver cell and a nerve cell from the same organism?

• 
• 
• 
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Many aquatic birds secrete waxy organic substances that repel water. The birds use these substances to coat their feathers. An analysis of these substances would reveal that they are composed mostly of

• lipids

• proteins

• carbohydrates

• nucleic acids

Which of the following is the main reason that humans need to include carbohydrates in their diet?

• Carbohydrates are broken down in cells for energy.

• Carbohydrates combine to form many different proteins.

• Carbohydrates act as catalysts to speed up chemical reactions.

• Carbohydrates are the building blocks for cell growth and repair.

Ovalbumin is a protein found in eggs. Which of the following best describes the molecular structure of ovalbumin?

• a group of six carbon atoms joined in a ring into a molecule

• a chain of amino acids folded and twisted into a molecule

• a set of three fatty acids attached to a molecule of glycerol

• a sequence of nitrogenous bases attached to a sugar-phosphate backbone

In the diagram above, the substance labeled X is most likely—

• an enzyme

• water

• ATP

• oxygen