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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

A group of whales is called a

a. harem. b. pod. c. covey. d. herd. e. bevy.

Biology & Microbiology

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

Biology & Microbiology