In a plant, which of the following is triploid (3n)?
A. Pollen grain
B. Embryo sac
C. Seed
D. Endosperm
E. None of the answers are triploid
D
Biology & Microbiology
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The bodies of arthropods are supported mainly by
a. an exoskeleton. b. only nonskeletal structures. c. a hydrostatic skeleton. d. an endoskeleton. e. joined exo- and endoskeletons.
Biology & Microbiology
When tissues organize, what do they form?
a. a cell b. a nucleus c. an atom d. an organ e. an enzyme
Biology & Microbiology
The pumonary artery contains oxygenated blood.
a. true b. false
Biology & Microbiology
The presence of which of the following indicates a current infection rather than a previous infection or vaccination?
A) IgA B) IgG C) IgM D) IgD E) IgE
Biology & Microbiology