Most monocots have numerous ____ roots
arising from the stem.
a. adventitious
b. primary
c. fibrous
d. secondary
e. tap
A
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A (n) ________ vector is a plasmid that can be replicated in several different organisms because it has at least one origin of replication that will function in each host.
A. phage B. expression C. shuttle D. chimeric
The release of factors by cells that influence the activity of nearby cells is referred to as
A. autocrine signaling. B. paracrine signaling. C. pheromonal signaling. D. electrical signaling. E. exocrine signaling.
Fire in the taiga
A) damages trees, resulting in excessively slow recovery due to low temperatures. B) alters nutrient cycling, making nutrients unavailable for trees. C) occurs often, resulting in decreased competition of vegetation adapted to repeated burning. D) results in systems dominated by grassland species.
Which one of the following is TRUE regarding an ecological pyramid?
A) An ecological pyramid can depict either the total amount of energy stored at each level of an ecosystem or the total biomass at each level. B) The population of producers depends largely on the populations of consumers below it. C) The amount of energy represented by tertiary consumers is greater than the amount of energy represented by primary consumers. D) Animals such as wolves and eagles would be located at the base of the pyramid. E) The amount of energy represented by producers is equivalent to the amount of energy represented by the secondary consumers.