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

Biology & Microbiology

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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.

Biology & Microbiology

Nematocysts are

a. reproductive cells. b. excretory organs. c. sets of muscle cells. d. circulatory cells. e. defensive cells.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology