The communities established under pure stands of eastern hemlock will likely become extinct because of ____
a. feeding on the trees by the wooly adelgid
b. the Bd infection of hemlock trees
c. pathogenic viruses attacking these populations
d. pathogenic fungi attacking hemlock trees
e. invasive species exploiting their niche
ANSWER: a
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In a lichen, the fungal partner, or mycobiont, receives ____
a. nutrients b. protection from herbivory c. aid in sexual reproduction d. enhanced dispersal of offspring e. shelter from radiation and desiccation
Which of these events occurred during the Paleozoic?
a. origin of Earth b. colonization of land by plants c. origin of eukaryotes d. origin of multicellularity e. first humans
Assume that in watermelon plants the genes for flower color (Y = yellow; y = orange flowers) and fruit shape (R = round; r = oval) are on the same chromosome. You cross two true-breeding plants, one with yellow flowers and round fruit and the other with orange flowers and oval fruit. You take one of the F1 individuals and cross it with a plant that is homozygous recessive for both traits. You get the following in the F2: 300 yellow flowers, round fruit; 300 orange flowers, oval fruit; 100 yellow flowers, oval fruit, 100 orange flowers, round fruit.What is the map distance between the genes for flower color and fruit shape?
A. 100.0 B. 40.0 C. 33.0 D. 25.0 E. 4.0
MOST new organic compounds are the result of CO2 fixation by
a. phototrophs. b. prototrophs. c. chemolithotrophs. d. chemoorganotrophs.