Practice Quiz

MCAS Biology Practice - Question List

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101. Which of the following processes releases primarily oxygen into the atmosphere?
  1. combustion
  2. osmosis
  3. photosynthesis
  4. respiration
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102. A tomato plant in a greenhouse was found to be infected with tobacco mosaic virus. A few weeks later, nearby plants were alsofound to be infected with the virus. Which of the following best describes how the virus reproduced?
  1. The virus made its own spores.
  2. The virus produced seeds in the tomatoes.
  3. The virus used the host plant’s resources and machinery to reproduce.
  4. The virus immediately killed the host plant and was free to reproduce.
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103. Dutch elm disease is a fungal infection of elm trees that usually results in death.The disease has killed millions of NorthAmerican elm trees that were not resistant to the fungus. Scientists have bred resistant elms by crossing North American species with Asian species that show resistance.Which of the following best describes how natural selection would promote resistant elm populations once the resistance genes from the Asian species were successfully introduced?
  1. After encountering elms with resistance genes, fungi would
    avoid elms and begin to attack other tree species.
  2. Resistance would spread to all of the mature elms in a population from the few trees that acquired the resistance genes.
  3. By reproducing with each other, elm trees with resistance genes would create super-resistant elms with twice the number of resistance genes.
  4. Elm trees with resistance genes would survive and pass on resistance to offspring, while trees without resistance would more likely be killed by the fungus.
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104. When lactose is digested by the human body, each lactose molecule is broken down into smaller molecules. To which of the following categories of molecules do these smaller molecules belong?
  1. amino acids
  2. monosaccharides
  3. nucleic acids
  4. polypeptides
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105. Unlike dairy milk, soymilk provides some of the body’s daily requirement for iron. In which of the following functions of the human body does iron serve a primary role?
  1. conducting nerve impulses
  2. strengthening bone structure
  3. causing muscle fibers to contract
  4. helping transport oxygen in the blood
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