The cyanobacterium Trichodesmium ________.
A. fixes a significant amount of N2 in oceanic environments
B. is a spherical organism
C. uses nitrite as a source of nitrogen
D. fixes N2 during the day
Answer: A
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In a pedigree:
A. males are circles; females are triangles. B. females are circles; males are triangles. C. males are squares; females are triangles. D. females are squares; males are triangles. E. males are circles; females are squares. F. females are circles; males are squares.
Resistance activities increase muscle mass by ____
a. stretching muscles b. increasing the number of mitochondria in cells c. encouraging the synthesis of more actin and myosin filaments d. encouraging the production of more muscle fibers e. converting red fibers to white fibers
In the embryonic development of flowering plants, the basal cell develops into the:a
apical cell. b. apical meristem. c. suspensor. d. integuments. e. endosperm.
In response to antigen-antibody binding, mast cells release chemicals called _____________ in an allergic reaction.
A. epinephrine B. histamine C. serotonin D. acetylcholine