Competitive advantages for cyanobacteria in the aquatic environment include ________.
A. the production of toxins to resist predation
B. the production of siderophores to bind iron
C. the ability of many to fix nitrogen
D. All of the choices are correct.
Answer: D
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The Sanger sequencing approach developed in the 1970s
A. has been rendered obsolete by the development of fundamentally different methodologies. B. is still the main approach used to determine nucleotide sequences. C. is applicable to RNA but not DNA. D. is useful for sequencing small DNAs but is not applicable to genome sized DNA molecules.
An individual that has two dominant alleles for a trait (AA) is __________. Fill in the blank(s) with the appropriate word(s)
Which statements about the Lake Victoria cichlid fishes are true? Check all that apply.
A. The adaptive radiation of the Lake Victoria cichlids may have resulted from a key evolutionary innovation. B. Many of the Lake Victoria cichlids have very specialized adaptations that allow them to occupy diverse habitats within the lake. C. Speciation of the Lake Victoria cichlids was mainly sympatric. D. The diversity of the Lake Victoria cichlids continues today because the lake is devoid of predators. E. The adaptive radiation of the estimated 300 species of cichlid fish was very rapid and took place during the last 200,000 years.
The phenomenon known as chemotaxis is defined as
A) the squeezing of cells through the lining of capillaries. B) the release of prostaglandins and leukotrienes in response to microbes. C) the movement of a cell toward or away from a chemical stimulus. D) the coating of a pathogen by complement. E) an increase in allergies and helminth infection.