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Embryology › ViewCohesive mass of pollen grains held together by a common sticky substance.
A. Callose
B. Pollinium
C. Compound pollen grain
D. Sporopollenin
Bacteria & Viruses › View
What is the last step in the viral reproduction cycle?
A. A virus attaches to the surface of a host cell
B. The proteins and genetic material start to assemble in the cell
C. The host cell bursts open, releasing the new viruses
D. The virus injects its genetic material into the cell