Practice Quiz

MTEL Biology Practice Exam - Question List

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46.
Which of the following best describes the function of bile salts in the process of digestion?
  1. Bonding to the surface of amino acids to allow them to be actively pumped against the concentration gradient by epithelial cells.
  2. Lowering stomach pH to produce the acid environment necessary for the proper functioning of enzymes and the destruction of pathogens.
  3. Coating fat droplets and preventing them from coalescing to expose more surface of the droplets to the action of hydrolytic enzymes..
  4. Cleaving bonds of amino acids to break long polypeptide chains into smaller segments that can be more easily absorbed.
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47.
Which of the following is the primary cause of most peptic ulcers in humans?
  1. Bacterial infection.
  2. Frequent ingestion of spicy foods.
  3. Viral eruption.
  4. Regular use of antacids.
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48.
Which of the following best describes an important role of the lymphatic system in circulation?
  1. Returning fluid and blood proteins lost by capillaries back to the veins.
  2. Transporting carbon dioxide released from cells to the bloodstream.
  3. Maintaining electrolyte balance of body fluids within tolerance limits.
  4. Removing toxins from the blood before they damage the heart.
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49.
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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50.
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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