A landslide in the Oregon Cascades causes all the soil in a 30-meter by 300-meter section of a mountain to fall away, taking the trees and their roots and all other vegetation with it. Within three years, however, lichens and some small herbaceous plants
can be seen on the surface of the remaining rock. This is an example of:
A) facilitation. B) secondary succession.
C) primary succession. D) a climax community.
Answer: C
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About 450 million years ago, the terrestrial landscape on Earth would have _____
A) looked very similar to that of today, with flowers, grasses, shrubs, and trees B) been completely bare rock, with little pools that contained bacteria and cyanobacteria C) been covered with tall forests in swamps that became today's coal D) had non-vascular green plants similar to liverworts forming green mats on rock
What is a single-nucleotide polymorphism?
A. any point mutation B. the presence of single nucleotides in the DNA double helix C. a site where a restriction enzyme cuts D. a site where RNA polymerase binds to DNA E. None of the above is correct.
Four of the five answers listed below are parts
of a germinating seed. Select the EXCEPTION
a. ovary b. cotyledon c. embryo d. coat e. endosperm
Bacteria reproduce
A. Asexually and sexually B. By binary fission C. Sexually only D. By conjugation E. Spore Formation