Ionizing radiation
a. breaks apart chromosomes.
b. alters genes.
c. extends the length of the DNA molecules.
d. links DNA molecules together.
e. both breaks apart chromosomes and alters genes.
E
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A) green bacteria / antenna pigments B) green bacteria / chlorosomes C) purple bacteria / antenna pigments D) purple bacteria / chlorosomes
A child is believed to have a Toxocara cati infection in his eye, which he acquired after playing with a stray cat for several weeks. A serum titer was performed, which revealed a titer of 1:8 . This laboratory value can be interpreted as:
a. normal. b. insignificant. c. diagnostic. d. negative.
A tall plant is crossed with a short plant, and the progeny are all intermediate in size between the two parental plantsIf the intermediate F1 progeny were allowed to self-pollinate, and the F2 progeny were also intermediate in size, but following a normal distribution, this would suggest
A) incomplete dominance. B) polygenic inheritance. C) complete dominance. D) a strong environmental influence. E) codominance..
The feature that most clearly separates eukaryotes from prokaryotes is the presence of _______ in eukaryotic cells.
a. ribosomes b. oxidative phosphorylation c. DNA molecules d. a nucleus