True or False. Phylogenetic trees represent hypotheses about the evolutionary relationships between groups of organisms
A. true
B. false
A
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Which of the following is the strongest evidence that cytokinins regulate cell divisions? There is _____
A) an increase of cyclin gene expression in tissues exposed to cytokinin B) a decrease of cyclin gene expression in tissues exposed to cytokinin C) an induction of shoot growths in tissues exposed to cytokinin D) an induction of root growths in tissues exposed to cytokinin E) an ability of cytokinin to interact with auxin at the molecular level and change auxin biosynthesis and transport
The packaging of eukaryotic DNA into chromatin renders most promoters inaccessible to RNA polymerases and activator proteins. Under these conditions, most eukaryotic genes are:
A. constitutively repressed. B. constitutively activated C. globally expressed. D. insulated by nucleosome binding.
The secretion of each of the anterior pituitary
hormones requires a. stimulation from the posterior pituitary. b. that they first be secreted from the neurons of the hypothalamus. c. two capillary beds. d. the action of minute amounts of releasing hormones. e. two capillary beds and the action of minute amounts of releasing hormones.
Which animals have a cylindrical body that is tapered at both ends?
A) platyhelminthes B) cnidarians C) annelids D) roundworms