The principal criterion used to classify fungi into divisions (the equivalent of phyla) is
a. the pigments found in the hyphal cells.
b. the components of their cell walls.
c. the biochemistry of their plasma membranes.
d. the morphology of the sexual spore-bearing structures.
e. the pattern of cilia on their external surfaces.
D; The exact nature of the spore-bearing structures (or lack of them) determines fungal classification. Fungi are sometimes pigmented, but color seems to bear no relation to taxonomy (choice a). The cells walls are basically similar, with chitin the principal component. The plasma membranes are also similar (choice c) and fungi do not have cilia (choice e).
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The endosymbiont hypothesis suggests that the mitochondria of eukaryotic cells are descended from captured
a. cyanobacteria. b. archaebacteria. c. aerobic bacteria. d. chemoautotrophic bacteria. e. eukaryotic algae.
If a daughter expresses an X-linked recessive
gene, she inherited the trait from
a. her mother. b. her father. c. both parents. d. neither parent. e. her grandmother.
A Barr body is an example of
A) constitutive euchromatin. B) facultative euchromatin. C) facultative heterochromatin. D) a nucleosome. E) constitutive heterochromatin.
Which of these gives the correct order from large to small?
a) muscle ? muscle cell ? myofibril ? sarcomeres ? filaments b) muscle ? sarcomeres ? myofibrils ? actin filaments ? myosin filaments c) muscle ? myofibrils ? sarcomeres ? muscle cells ? filaments d) muscle ? muscle fibers ? sarcomeres ? filaments ? myofibrils e) muscle cells ? myofibrils ? filaments ? sarcomeres