Practice Quiz

MCAT Biology - Question List

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66. Which of the following best explains why enzymes are necessary for many cellular reactions?
  1. Enzymes supply the oxygen necessary for the reactions.
  2. Enzymes change reactants from solid to liquid during
    the reactions.
  3. The reactions take up too much space in the cell if enzymes are missing.
  4. The reactions are too slow to meet the needs of the cell if enzymes are missing.
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67. Nerve cells use which of the following to communicate with each other?
  1. antibodies
  2. electrochemical signals
  3. enzymes
  4. simple sugars
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68. Lemurs’ bodies are adapted to efficiently store energy for times when food is scarce. This adaptation may help to explain how lemur ancestors survived the trip across the Mozambique Channel from mainland Africa to Madagascar. Which of the following types of molecules are primarily used for long-term energy storage in the lemur?
  1. lipids
  2. monosaccharides
  3. nucleic acids
  4. proteins
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69. Lemur body types can vary widely. In addition to fossils and comparative anatomy, which of the following types of evidence can scientists reliably use to study the evolution of the variety of lemur body types?
  1. lifespan
  2. population sizes
  3. DNA sequences
  4. male-to-female ratio
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70. There are at least 88 species of lemurs in existence today. Which of the following conditions most likely existed and made it possible for Madagascar’s original lemur ancestors to evolve into many species on the island?
  1. presence of a deadly virus that infected only lemurs
  2. complete isolation from other small mammal species
  3. new niches to adapt to in the absence of a large number of competitors
  4. climatic conditions that were very different from those on mainland Africa
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