Thermohaline Circulation
What will be an ideal response?
Surface water cools as it moves north, increasing density
When it freezes, salt is excluded
Dense, salt laden water sinks at poles to ocean bottom, circles back to equator, rises at upwellings
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Human ventilation is
(a) negative pressure inhalation. (b) positive pressure inhalation. (c) negative pressure exhalation. (d) both b and c.
The single-celled yeast, Saccharomyces cerevisiae, was used to construct the first eukaryotic artificial chromosome. This was a significant achievement because
A) yeast centromeres are identical to human centromeres. B) it defined chromosomal regions that serve as centromeres and origins of replication in yeast. C) it revealed the rate of DNA replication in yeast. D) it demonstrated that some yeast genes are not essential. E) it defined the chromosomal region with the TRP+ gene for tryptophan synthesis in yeast.
One mechanism that may lead to novel disease treatment involves ________, which hinders the translation of specific mRNAs
A) siRNA B) tRNA C) P bodies D) macro-RNAs E) rRNA
When food distends the stomach, the hormone ____ is produced, which stimulates the gastric glands
a. secretin b. gastrin c. cholecystokinin d. gastric inhibitory peptide e. lipoprotein lipase