Practice Quiz

IB Biology Exam Prep - Question List

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116.
The "fight or flight" response to a stress is initiated when nerve impulses stimulate the:
  1. Thyroid to produce the hormones triiodothyronine and thyroxine.
  2. Posterior pituitary to release the tropic hormone adrenocorticotrophic hormone.
  3. Adrenal medulla to secrete the catecholamines, epinephrine and norepinephrine.
  4. Parathyroid glands to release the glucocorticoid hormone cortisol.
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117.
Which of the following is a major difference between cartilage and other types of connective tissues? 
  1. The extracellular matrix in cartilage lacks collagen.
  2. Cartilage does not contain blood vessels.
  3. The primary mineral in cartilage is phosphorus rather than calcium.
  4. Cartilage cells do not possess nuclei.
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118.
In the human skeleton, which of the following has a pivot joint?
  1. Shoulder
  2. Knee
  3. Elbow
  4. Finger
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119.
Which of the following best describes how muscle fibers contract?
  1. Actin filaments shorten during the early phase of contraction, and myosin filaments shorten during the later phase of contraction.
  2. Actin and myosin filaments wind tightly around each other during contraction, which shortens their lengths.
  3. Actin filaments shorten during contraction, while myosin fibers stretch.
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120.
The stratum corneum tissue of human skin consists mainly of dead cells that are continuously sloughed off and replaced by new cells migrating from underlying layers. This characteristic of the stratum corneum is most directly related to the skin’s ability to:
  1. Maintain elasticity and tone in underlying muscle and connective tissue.
  2. Provide a continuous supply of leukocytes as part of the innate immune response.
  3. Replenish worn and damaged sensors of the peripheral nervous system.
  4. Protect against injury and serve as a barrier against the entry of pathogens.
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