An aquatic microbe that can grow only near the surface of the water is probably which of the following?
A. a phototroph
B. a heterotroph
C. a chemotroph
D. a lithotroph
E. an anaerobe
Answer: A
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Encapsulated strains of Streptococcus pneumoniae are particularly pathogenic, because they
A) produce exotoxin A. B) produce exotoxin B. C) are potentially very invasive. D) produce M protein surface antigens.
DNA is wrapped around histones, which contain many copies of the positive amino acids lysine and arginine. These positive amino acids neutralize the negative charge of the ______________ of the DNA wrapped around the histone
A. ribose sugar B. hydroxyl group C. nitrogenous base D. phosphate group E. All of the answer options are correct.
Over time, the movement of people on Earth has steadily increased. This has altered the course of human evolution by increasing _____
A) nonrandom mating B) geographic isolation C) genetic drift D) gene flow
E.coli synthesizing K and B in the large intestine would be an example of which type of symbiosis?
A) antagonism B) commensalism C) parasitism D) mutualism