Maureen Stanton and colleagues (1986 ), experimenting with wild radishes (Raphanus raphanistrum), demonstrated that sexual selection on male flowers has led to ________
A) many small flowers that attract male pollinators
B) showy flowers that attract male pollinators
C) flowers with large nectar-producing glands to attract male pollinators
D) flowers where male and female flowers appear on the same plant
B
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According to MacArthur and Wilson's theory of island biogeography, both the land area (size) of an island and the _____________________ contribute to species diversity
A. depth of the water surrounding the island B. distance of the island from neighboring land masses C. rock composition of the island D. climate of the island E. proximity of the island to the equator
Slow-growing NTM whose colonies become pigmented when exposed to light are referred to as:
a. scotochromogens. b. photochromogens. c. nonphotochromogens. d. chromogenicums.
Which of the following causes a dividing cell to pinch in two by contracting like a purse string?
A. centrioles B. actin filaments C. microtubles D. pili E. intermediate filaments
Which of the following sequences of events is most characteristic of a generalized plant life cycle?
A. sporophyte ® mitosis ® spore ® gametophyte ® gamete ® zygote B. sporophyte ® meiosis ® spore ® gametophyte ® gamete ® zygote C. gametophyte ® meiosis ® spore ® sporophyte ® gamete ® zygote D. gametophyte ® mitosis ® spore ® sporophyte ® gamete ® zygote