Which of the following is an example of a mutualistic association involving a fungus?
A. Fungal hyphae penetrate a plant root and
provide the plant with nutrients and receive
organic molecules in return.
B. Fungal spores infect and then eventually
kill an insect.
C. A fungus produces rings that allow it to
capture and feed upon nematode worms.
D. A fungus invades the xylem of a tree and
eventually kills it.
E. A fungus causes Athlete's foot in a human.
A
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Epigenetic modifications affect the nucleotide sequence of the DNA
a. True b. False Indicate whether the statement is true or false
Gated channels are NOT utilized by the cell ____
a. to transport water b. to stimulate muscle contraction c. to generate nerve signals d. for facilitated diffusion e. to transport sodium
Approximately how many gene products are involved in the synthesis of melanin in humans?
a. 10 b. 25 c. 50 d. 100 e. 1000
Approximately what percent of the energy that enters a trophic level becomes available to the next trophic level?
a. 2 to 12 b. 3 to 13 c. 4 to 14 d. 5 to 15 e. 5 to 30