Practice Quiz

NAEP Science Grade 12 - Question List

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171.
Which of the following best describes the role of clonal selection in the development of acquired immunity to a pathogen?
  1. Leukocytes that are stimulated as a result of increased body temperature during an infection differentiate from their precursor stem cells more rapidly.
  2. Lymphocytes that possess receptors that can bind to the pathogen's antigens rapidly divide to produce many cells capable of recognizing and attacking the pathogen.
  3. Natural killer cells that produce antibodies capable of attacking the pathogen are stimulated to produce more antibodies than cells that do not produce such antibodies.
  4. Phagocytes that ingest many pathogens over a short period of time grow and divide more rapidly than those that have not ingested many pathogens.
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172.
Evidence suggests that fever is a mechanism of homeostasis that can help fight infection by:
  1. Reducing the permeability of plasma membranes to pathogens.
  2. Increasing the concentration of oxygen in the blood.
  3. Lowering blood pressure and heart rate.
  4. Enhancing production and mobility of leukocytes.
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173.
Which of the following best describes an aneurysm and its effect on circulation?
  1. An aneurysm is a blood clot that may stick in an artery and restrict blood flow.
  2. An aneurysm is a deposit of plaque on the wall of an artery that may impede or block blood flow.
  3. An aneurysm is an abnormal connection between an artery and a vein that can lead to decreased oxygen delivery to tissues.
  4. An aneurysm is a weak spot in the wall of an artery that may rupture and cause a major hemorrhage into surrounding tissues.
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174.
Which of the following best describes the function of the cilia that are attached to the epithelial lining of the bronchi and bronchioles of the lungs?
  1. Producing mucous and other secretions that trap pathogens.
  2. Insulating delicate lung tissue from exposure to cold inhaled air.
  3. Moving particulate contaminants upward to the pharynx.
  4. Trapping inhaled oxygen molecules for transfer to the blood.
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175.
Which of the following best describes the mechanism by which hemoglobin loads and unloads oxygen?
  1. Production of CO2 during cellular respiration lowers blood pH, which decreases the affinity of hemoglobin for oxygen and facilitates the unloading of oxygen to cells.
  2. Oxygen molecules binding to one subunit of a hemoglobin molecule change its shape, and the other three subunits also change shape and accept oxygen more readily.
  3. Blood arriving at the lungs has a lower PO2 pressure than the air inside the lungs, which favors the diffusion of oxygen into the blood from the lungs.
  4. Carbon dioxide in the blood as a result of increased cellular respiration causes the heart's pacemaker to speed up and increase the transport of oxygen to cells.
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