Monod's group found that that appearance of ?-galactosidase correlated with that of galactoside permease. This ultimately led his group to the conclusion that:
A. constitutive expression involved two genes.
B. ?-galactosidase production is contingent on the presence of galactosidase.
C. the expression of ?-galactosidase and permease is under the control of another gene.
D. a mutation in the ?-galactosidase gene would decrease expression of a permease gene.
E. a mutation in the regulator gene would decrease expression of galactosidase and permease.
C
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If a cell had a chromosome number of four,
after anaphase but before the cytoplasm divides, how many chromosomes does the cell have?
a. 2 b. 4 c. 8 d. 16 e. none of these
A bacterial smear stained with a Gram's stain is best viewed using a
A. dark field microscope B. light microscope C. electron microscope D. fluorescence microscope E. phase contrast microscope
Adolescence is marked by maturation of the reproductive organs and the human sexual response, an event known as ________
Fill in the blank(s) with correct word
A/n _______ is a chemical that destroys bacteria except for those in the endospore stage.
A) bacteriostat B) fungistat C) bactericide D) antibiotic