Biology Forums - Study Force

Class II MHC proteins are present in the plasma membrane only when
 A) a helper T cell has engulfed an antigen.
  B) an antigen-presenting cell has engulfed and is processing an antigen.
  C) a virus-infected cell secretes interferons.
  D) a cancerous cell gets attacked by NK cells.
  E) the body cells are healthy.

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(Question 2) The basal nuclei
 A) initiate conscious motor activity.
  B) activate spinal reflexes.
  C) provide the background patterns of movement involved in voluntary motor activities.
  D) exert direct control over lower motor neurons.
  E) act as gatekeepers, filtering out unnecessary sensorimotor activity.

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(Question 3) An abnormal cell would be identified by the immune system because it showed
 A) Class I MHC proteins.
  B) Class II MHC proteins.
  C) Class I MHC proteins with an antigen bound.
  D) Class II MHC proteins with an antigen bound.
  E) a CD3 receptor complex in the membrane.

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(Question 4) The pyramids on the ventral surface of the medulla oblongata are formed by fibers of the ________ tracts.
 A) corticospinal
  B) corticobulbar
  C) reticulospinal
  D) vestibulospinal
  E) tectospinal

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(Question 5) Martha had a heart transplant. In order to keep her body from rejecting the transplant she takes
 A) aspirin.
  B) antacids.
  C) immunosuppressive drugs.
  D) anti-rheumatic drugs.
  E) anti-histamines.

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(Question 6) Based on the motor homunculus, which of the following body regions has the fewest number of motor units involved?
 A) tongue
  B) face
  C) hands
  D) back trunk

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(Question 7) Hormones that slow tumor growth are called
 A) transferrins.
  B) tumor necrosis factors.
  C) interferons.
  D) radiation agents.
  E) chemotherapins.

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(Question 8) The ________ tract provides subconscious regulation of upper limb muscle tone and movement and is part of the ________ pathway.
 A) tectospinal; lateral
  B) rubrospinal; lateral
  C) reticulospinal; medial
  D) vestibulospinal; lateral
  E) corticobulbar; medial

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(Question 9) Hormones that regulate the activity of B cells and T cells and enhance nonspecific defense are called
 A) calcitriol.
  B) glucocorticoids.
  C) mineralocorticoids.
  D) interleukins.
  E) immunoglobulins.

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(Question 10) Axons of the corticobulbar tract terminate in the
 A) sensory neurons.
  B) somatic motor neurons in the spinal cord.
  C) autonomic motor neurons in the spinal cord.
  D) motor nuclei of cranial nerves.
  E) nuclei in the thalamus.

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