What cell type secretes histamine at the site of an infection?
A) macrophages
B) cytotoxic T cells
C) mast cells
D) natural killer cells
E) helper T cells
Ans: C) mast cells
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A transcriptional repressor contains an amphipathic helix. Which of the following changes within the repressor would most likely disrupt its function?
A. serine to threonine B. aspartate to glutamate C. leucine to valine D. leucine to lysine E. valine to methionine
The process by which a fertilized egg becomes a distinct organism is called The process by which a fertilized egg becomes a distinct organism is called
A. epigenesis. B. cellular dedifferentiation. C. involution. D. embryonic development. E. metamorphosis.
A group of whales is called a
a. harem. b. pod. c. covey. d. herd. e. bevy.
Which of the following is a hormone that regulates the reabsorption of sodium by the distal convoluted tubules and collecting ducts?
A) aldosterone B) ANP C) angiotensin D) ADH