Practice Quiz

IB Biology Exam Prep - Question List

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101.
Panting by mammals is part of a feedback response that cools the body by:
  1. Hyperventilating the lungs.
  2. Dilating capillaries in the mouth and throat.
  3. Triggering a countercurrent heat exchange.
  4. Increasing evaporative heat loss.
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102.
A veterinarian finds that a cat has a lesion on its hypothalamus. This injury would most directly affect the cat's ability to:
  1. Coordinate muscle movements.
  2. Regulate its body temperature.
  3. Perceive visual stimuli.
  4. Control its breathing.
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103.
Which of the following is a function performed by the liver?
  1. Regulation of blood flow to the stomach during digestion.
  2. Generation of new red and white blood cells.
  3. Removal of wastes and toxins from the blood.
  4. Control of peristalsis in the digestive tract.
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104.
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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105.
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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