Carriers
A. may have a persistent infection.
B. may be a source of infection.
C. usually show symptoms of the disease.
D. have been cured of the infection.
E. may have a persistent infection AND may be a source of infection.
E
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The enzyme responsible for proofreading a growing DNA strand and for replacing mismatched nucleotides is
A. DNA polymerase. B. helicase. C. topoisomerase II. D. DNA ligase. E. DNA replicase.
A land biome is primarily defined by the dominant ________ that exist in similar climatic conditions around the world.
a. prey species b. predators c. plant species d. temperatures
Transgenic animal disease models are engineered to display disease symptoms similar to those observed in
____________________. Fill in the blank(s) with the appropriate word(s).
With the advent of photosynthesis and the subsequent production of oxygen by photosynthetic organisms, most of the anaerobic organisms present on Earth became extinct because oxygen was actually toxic to these organisms
Indicate whether the statement is true or false