The ascomycetes are named for their characteristic reproductive structure called a(n) ________.
A. ascocarp
B. hypha
C. thallus
D. ascus
Answer: D
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In angiosperms, double fertilization
A. must happen to the pollen, forming the male gametophyte, and also to the egg, forming the female gametophyte. B. happens in the eudicot group of plants with two cotyledons. C. is a pairing of fertilization events, with one forming the sporophyte and the other forming the gametophyte. D. results in the diploid zygote, and the triploid endosperm. E. produces the four microspores in the male, and the four megaspores in the female.
Crossing-over is
A) the place on a homologous pair of chromosomes at which a physical exchange occurs. B) an extremely rare event. C) an event that only takes place during meiosis. D) the reciprocal exchange of homologous regions of chromatids. E) not useful in mapping genes.
Which of the following cell types are specifically responsible for the cytotoxic T cell response?
A) T cells B) B cells C) natural killer cells D) phagocytic cells
Members of the phylum ________ are characterized by having tube feet
A) Echinodermata B) Mollusca C) Annelida D) Platyhelminthes E) Arthropoda