The lac operon of E. coli is ________ when the repressor is bound to lactose.

a. active
b. inactive
c. cloned
d. unregulated


active

Biology & Microbiology

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Supertasters for the chemical PTC are ____ for the trait

a. homozygous dominant b. heterozygous c. homozygous recessive d. either homozygous dominant or homozygous recessive e. either homozygous dominant or heterozygous

Biology & Microbiology

Answer the question using the accompanying figure. Which branch of this phylogenetic tree identifies Bacteria?

a. A b. B c. C d. D e. E

Biology & Microbiology

The degree of relatedness between a niece and an uncle is _____, and the degree of relatedness

between first cousins is ______.

a. 0.75; 0.50 b. 0.50; 0.25 c. 0.25; 0.125 d. 0.125; 0.0625 e. 0.0625; 0.03125

Biology & Microbiology

An atom carries no charge because it has as many electrons as ____

a. protons b. neutrons c. orbitals d. neutrinos e. shells

Biology & Microbiology