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.

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When tissues organize, what do they form?

a. a cell b. a nucleus c. an atom d. an organ e. an enzyme

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The pumonary artery contains oxygenated blood.

a. true b. false

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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

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