Why are ferns considered incompletely adapted to the terrestrial environment, when compared with other plants?
A) They lack vascular tissue.
B) Their sperm are flagellated.
C) The gametophyte generation is dominant.
D) They lack cuticle.
B
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Sunlight resets biological clocks in plants by activating and inactivating photoreceptors called ________
a. statoliths b. jasmonates c. phytochromes d. phototropin
RNA differs from DNA in many ways, including
A. DNA contains deoxyribose and RNA contains ribose. B. DNA contains thymine and RNA contains uracil instead of thymine. C. All are correct. D. DNA is double stranded and RNA is single stranded. E. RNA can catalyze some chemical reactions and DNA cannot.
What defines a population in evolution?
A. Multiple species interacting together in an ecosystem B. Members of the same community C. Members of a single species that may, or may not, share a common space D. Interbreeding members of the same species that share a common space
How small is the smallest object that can be seen with a light microscope?
a. 2 µm b. 0.2 µm c. 2 nm d. 0.2 nm