Uracil forms a complementary pair with ____ in RNA and ____ in DNA
a. adenine; adenine
b. adenine; thymine
c. thymine; thymine
d. thymine; adenine
e. uracil; uracil
a
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When analyzing a cross involving two traits, each trait is analyzed separately, and then the frequencies of each are
combined to yield the observed phenotypic ratios. a. True b. False
An acid is a substance that, in solution, releases
A. oxygen ions in H2SO4. B. hydrogen ions, for example, HCl. C. —COOR ions from beer. D. chloride ions from NaCl.
Secondary endosymbiosis can occur when a
A) nonphotosynthetic protist engulfs a photosynthetic bacterium. B) virus infects a photosynthetic prokaryote. C) protist evolves to become a prokaryote. D) nonphotosynthetic protist engulfs a photosynthetic protist. E) green alga engulfs a photosynthetic bacterium.
A virus that infects a bacterium is called a/an ____________.
Fill in the blank(s) with the appropriate word(s).