Which of these following marine ecosystems has the highest mean net primary productivity?
a. continental shelf
b. estuaries
c. kelp beds and reefs
d. open ocean
e. upwelling zones
C
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In mammalian cells, the mRNA sequence elements that target the mRNA for rapid degradation are called:
A. AU-rich elements. B. upstream open reading frames. C. age responsive elements. D. enhancers.
Mitochondria probably developed before the atmosphere was oxygen rich
Indicate whether the statement is true or false.
Genes whose expression (or abnormal expression) cause cancer are called ________.
A. cancer genes B. carcinogens C. progenes D. oncogenes
About 180 liters of blood plasma is filtered into human nephrons per day and, of that amount, about 2-3 liters leaves the body as urine. Therefore, the percentage of plasma filtrate that leaves as urine each day is about ________.
A. 0.1-0.2 percent B. 0.5-1.0 percent C. 1-2 percent D. 5-10 percent E. 10-20 percent F. 20-50 percent