Species of Rhizobium and Bradyrhizobium bacteria are most directly associated with
a. nitrification.
b. ammonification.
c. nitrogen cycling.
d. nitrogen fixation.
e. nitrogen assimilation.
D
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Cattle egrets hitch a ride on domestic cows and eat insects that are stirred up by their activity. What term describes this relationship?
A) commensalism B) competition C) predation D) parasitism
The spontaneous formation of organic molecules does not happen today because they are
A. consumed by organisms or oxidized to simpler inorganic compounds in the atmosphere. B. destroyed by the increase in harmful radiation coming through holes in the ozone layer. C. unable to form because of a lack of sufficient internal energy. D. photosynthesis is all that is required.
Suppose that each species of Galápagos tortoise has a distinctive shell. Variations in shell size make some tortoises better adapted for defence. Imagine an island where many hunt on these tortoises; individuals with a larger shell would be more likely to survive and reproduce than would tortoises with smaller shells. These favoured individuals would pass on the genes that produce larger shells to their descendants, while those with smaller shells would not reproduce, leading to extinction. Which of the following would be most likely to drive this event?
a. spontaneous selection b. hereditary selection c. natural selection d. artificial selection
Which of the following can be used directly to code for important viral proteins during viral replication?
A. -RNA B. dsDNA-RT C. +RNA D. ssDNA-RT E. dsRNA