Which type of RNA carries the code from the DNA to the site where the protein is assembled?
a. messenger RNA
b. nuclear RNA
c. ribosomal RNA
d. transfer RNA
e. structural RNA
a
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Auxin:
A. prevents cell elongation. B. is transported from young leaves to differentiated vascular tissue. C. has a net positive charge in the cytoplasm of cells. D. inhibits cellular production of PIN proteins. E. inhibits fruit ripening.
Which of the following comparisons of oviparity and viviparity is incorrect?
A. In viviparity, the mother has a lower metabolic investment in her young than in oviparity. B. Viviparity occurs in most mammals; oviparity occurs in birds. C. In viviparity, fertilized eggs are retained within the mother; in oviparity, the fertilized eggs are released into the environment. D. In viviparity, there is parental care; there is no parental care in oviparity. E. In viviparity, the fertilized egg does not need protection from dessication; in oviparity the fertilized egg often needs protection from dessication.
A calcium-binding protein that aids in the activation of many enzymes, including myosin light-chain kinase, is
A) calcium phosphorylase. B) activase. C) calmodulin. D) myosin light-chain phosphatase. E) junctional complex.
What would result for global climate from a massive drop in atmospheric carbon dioxide?
A. An increase in ocean temperature B. Increased nitrogen availability C. Increased rock weathering D. A decrease in surface temperature E. A decrease in free oxygen content