What results after a speciation event?
A) Two species have evolved that are each different from the original species.
B) One new species evolves, while the original species stays the same.
C) One new species evolves, while the original species may stay the same or evolve into something different.
D) One new species evolves, while the original species goes extinct.
C
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The concentration of infectious plaque forming units (pfu) per volume of fluid is known as the
A) infectivity. B) virulence. C) titer. D) fluid infectivity.
The human immunodeficiency virus (HIV) only affects a specific class of cells in the immune system called helper T cells, and not other types of T cells. Which is the best explanation for this observation?
A. Only helper T cells have the correct receptor on their cell surface. B. HIV can only be released from helper T cells. C. Only helper T cells have reverse transcriptase. D. HIV can only replicate inside of helper T cells. E. The helper T cells are not necessary for the immune system to fight viral infections.
The freshwater leech is an organism that feeds off of the blood of other organisms such as frogs and turtles. Which interaction describes the relationship between freshwater leeches and frogs or turtles?
A) herbivory B) predation C) mutualism D) parasitism
Which of the following base pairs would be targeted and repaired by a mismatch repair system?
A. C-G B. A-T and C-G C. A-G D. A-T E. A-G and C-G