The cell types that lack a membrane-bound nucleus are found in the
A. eukaryotes.
B. prokaryotes.
C. archaea.
D. protista.
E. prokaryotes AND archaea.
E
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What is the pH of a solution that contains 0.2 M H2CO3 (carbonic acid) and 0.2 M NaHCO3? The pKa of carbonic acid is 6.4
A. 6.7 B. 6.4 C. 6.0 D. 5.8 E. 5.3
Which of the following areas is still seeing an increase in deforestation?
a. United States b. Europe c. China d. Brazil e. Canada
Cats cannot synthesize the amino acid taurine. This means that in cats, taurine
A. is an essential amino acid. B. must be stored in cellular compartments. C. is not present in their normal diet. D. is not a required nutrient.
Humans contract bacterial infections such as tuberculosis or syphilis. What is this ecological relationship called?
A) Resource partitioning B) Predation C) Mutualism D) Parasitism E) Competition