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

Biology & Microbiology

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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

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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.

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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.

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A virus that infects a bacterium is called a/an ____________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology