Some microbes secrete small molecules that induce other microbes to settle nearby. When a certain number of individuals have assembled, the chemical signal is strong enough to induce the aggregation to respond collectively to stimuli. This process is called
A. quorum sensing
B. mass-settling
C. conjugation
D. bioremediation
E. mutualism
Answer: A
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All of the following statements about the brown algae are true except:a
this group includes the most complex algae that have blades, stipes, and holdfasts. b. they share a common ancestor with representatives of the plant kingdom. c. they represent the largest members of the algae called seaweeds. d. they are harvested for algin, which is used in a variety of commercial products. e. they are ecologically important as producers and in providing habitats along rocky coastlines.
The purpose of mitosis is to enable existing cells to
a) grow b) generate new, genetically diverse cells c) die on purpose d) generate new, genetically identical cells e) generate gametes
Which of the following statements most accurately describes transformation in bacteria?
A. Transformation is the creation of a strand of RNA from a DNA molecule. B. Transformation is the infection of cells by a phage DNA molecule. C. Transformation is the creation of a strand of DNA from an RNA molecule. D. Transformation is the assimilation of external DNA into a cell.
Which of the following play(s) a role in root nodule formation?
a. rhicadhesin b. lectins c. oligosaccharide signaling molecules d. all of the above