Mycorrhizal fungi have a mutually beneficial relationship with plants in environments with soils that
A) are saturated with water.
B) have a high clay content.
C) are acidic.
D) are low in nutrients.
D
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What are the results of the release of cAMP from Dictyostelium discoideum?
A. The larger cells cannibalize the smaller, less developed cells. B. Cells aggregate, forming a large motile multicellular slug, precursor to the development of a fruiting body. C. The cells form cysts until the growing conditions improve. D. The cells develop flagella.
Nematocysts are
a. reproductive cells. b. excretory organs. c. sets of muscle cells. d. circulatory cells. e. defensive cells.
The two groups representing the "jawless" fishes are:a
Cephalochordata and Placoderms. b. Chondrichthyes and Actinistia. c. Myxini and Petromyzontida. d. Dipnoi and Actinistia. e. Placoderms and Petromyzontida.
A random alteration in the sequence of DNA nucleotides that provides a new variant allele is known as a
A. disruption. B. gene mutation. C. polymorphism. D. gene frequency.