In order for high level expression of the E. coli lac operon to occur, a complex of catabolite activator protein and ________ must be bound to the DNA near the promoter.
Fill in the blank(s) with the appropriate word(s).
cAMP, cyclic AMP
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The most common control mechanism to prevent overproduction or underproduction of hormones is
a. positive feedback. b. opposing interaction. c. negative feedback. d. synergistic interaction. e. permissive interaction.
You find an Arabidopsis plant in your greenhouse that lacks stamens and carpels, and has two rows of petals and sepals. What happened to cause this abnormal flower development?
A. a mutation in gene C B. an overexpression of gene B C. a mutation in gene A D. a mutation in gene C and overexpression of gene E E. mutations in gene C and gene A
Which statement is true about prokaryotes?
A. They do not divide by mitosis. B. They contain a long, linear strand of DNA as the genetic material. C. They lack ribosomes. D. They contain a nucleus. E. They usually lack a cell wall.
Progressive changes in the fossil record are evidence for evolution because
A. they show gaps in the fossil record. B. they show descent with modification. C. they show inheritance of acquired characteristics. D. they show evolutionary change at the level of the individual.