In the lac operon, Is mutations allow
A) constitutive expression of Lac proteins.
B) regulated expression of Lac proteins.
C) ?-galactosidase activity only.
D) no expression of Lac proteins.
E) none of the above
D) no expression of Lac proteins.
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Some of the most dramatic evidence for evolution has come from human agriculture. One of the most highly artificially selected crop plants is
A. peas. B. tomatoes. C. potatoes. D. corn. E. asparagus.
In meiosis, cells become haploid ____
a. at the end of telophase I b. during metaphase I c. during anaphase I d. at the beginning of metaphase II e. at the end of prophase II
The method by which cell components are separated by centrifugation at progressively higher speeds is called _______ centrifugation.
a. differential b. velocity c. density-gradient d. equilibrium
Most bony fishes have a hard plate that covers the gills on each side of the head called the
A. operculum. B. pharyngeal slits. C. lateral lines. D. gill arches. E. radula.