Chromatin remodeling
a. is subject to well-characterized stages of regulation by the cell.
b. blocks access to genes that should not be expressed in a particular cell.
c. is unaffected by alterations to the DNA sequences of a cell.
d. results in specific patterns of gene expression.
e. is generally independent of histone protein arrangements.
D
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Which of the following factors likely did NOT contribute to the evolution of distinctive human characteristics relative to Great Apes?
A. alteration of developmental timing so that certain juvenile characteristics are retained in the sexually mature adult B. the evolution of bi-pedalism followed by evolutionary modifications to the skull, pelvic structure, foot and legs C. the evolution of bi-pedalism followed by increasingly sophisticated tool use, cognitive ability, and social organization D. the evolution of the FoxP2 gene associated with more sophisticated language E. the evolution of opposable thumbs followed by increasingly sophisticated tool use
Ferroplasma acidarmanus is ________.
A. capable of growth at pH 0 B. lacks a cell wall C. capable of oxidizing iron D. All of the choices are correct.
During which part of the bird respiratory cycle is O2 NOT extracted from the air?
a. the first inhalation b. the first exhalation c. the second inhalation d. the second exhalation e. the third exhalation
An increase in total peripheral resistance, in the absence of any change in cardiac output, would
A) reduce the stretch on the aorta. B) elevate mean arterial pressure. C) decrease pulmonary venous pressure. D) reduce mean arterial pressure. E) decrease central venous pressu