Which two processes are responsible for the shape of the curve at Time B?
1. transduction
2. entry of single-stranded Hfr DNA
3. rolling circle replication of single-stranded Hfr DNA
4. activation of DNA pumps in plasma membrane
A) 1 and 2
B) 1 and 4
C) 2 and 3
D) 3 and 4
C
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Compared with sponges, cnidarians have a wider array of cell types permitting more sophisticated tissue functions. These functions include (select all that apply):
A. secretion of digestive enzymes. B. muscle contraction/movement. C. the ability to sense the environment via a network of nerve cells. D. the ability to communicate within the organism using hormones. E. none of these
A gardener is constantly struggling with the growth of weeds in his perennial flower beds. At
the start of the growing season one year, he sprays an herbicide to reduce the number of weeds. Although the herbicide kills many of the weeds, some develop resistance to the herbicide and continue to grow and spread among his flowering plants. After a few years, the gardener decides to stop all herbicide applications. One of the changes that he notices is that the weeds that have resistance to herbicides grow much more slowly and are easily outcompeted by other weeds when no pesticides are sprayed (i.e., the herbicide-susceptible weeds produce more seeds and quickly overtake some of the areas in the garden where the herbicide-resistant weeds had been growing).
Resistance to herbicides has arisen in the population through the process of __________.a. natural selection b. mutation c. evolution d. fertilization
What features are typical of plants that are good at performing phytoremediation? a. Grow large b. All of these choices
c. Able to uptake large amounts of contaminants d. None of these choices. e. Grow rapidly
The highest diversity of plant and animal life occurs in
A) tropical savannas. B) tropical rain forests. C) temperate deciduous forests. D) boreal forests.