Suppose you are a botanist and you discover a plant that has a dominant gametophyte, but no xylem or phloem. Into which group should you classify this plant?
a. angiosperms
b. gymnosperms
c. seedless vascular plants
d. bryophytes
Ans: d. bryophytes
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Broad-sense heritability is defined as
A) VG. B) VP. C) VE. D) VG/VP. E) VP/VG.
Which of the following statements concerning calcium ions is FALSE?
a. They are involved in fertilization, blood clotting, and microtubule disassembly. b. Their concentration in the cytosol rises when Ca2+ gates open in the ER. c. Their concentration in the cytosol is usually higher than in the extracellular fluid. d. They can act by themselves, without binding to calmodulin. e. They can exert an effect after binding to calmodulin.
Individuals with variations that make them best suited to their environment are, on average, more likely to ________
A) evolve B) change over time C) survive and reproduce D) be larger
All of the following contribute to the rise of emerging diseases, except
A. the decrease in drug-resistant bacteria. B. changes in agricultural practices. C. populations are more mobile. D. human encroachment on wild habitats.