As has been well-documented in recent years, certain populations and geographic regions can be much more vulnerable to environmental health issues like malaria and the use of DDT. Growing populations, with over 20-30% infected with HIV/AIDS, global climate change, and an environment that has experienced DDT applications for over 50 years, have led to increased outbreaks of malaria in the tropical regions of Africa. Which of the following nonhuman-related causes has most likely contributed the most to the increase in malaria in Africa?
A) increased insecticide resistance
B) less money for mosquito abatement programs
C) increased vulnerability of HIV-infected humans to malaria
D) growing urban populations
E) increased difficulty in treating malaria with antibiotics
Answer: A) increased insecticide resistance
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Although they have changed shape through erosion and mountain building, the positions of the major
continents relative to one another has remained fixed since the Earth was formed.
Indicate whether the statement is true or false.The amount of Oxygen in the blood carried by hemoglobin in the red blood cell is 2%.
a. true b. false
Which of the following eukaryotic DNA polymerases replicates mitochondrial DNA?
A) alpha B) beta C) delta D) epsilon E) gamma
Which of the following statements concerning leucine zipper protein dimerization and DNA binding is correct?
A. Leucine zipper proteins function as a dimer with both subunits making contact with the sequence-specific DNA site. B. Leucine zipper proteins use ionic bonds to bind with the sequence-specific DNA site. C. Leucine zipper proteins contain many leucine amino acids in the DNA-binding region that facilitate sequence-specific DNA binding. D. Leucine zipper protein dimerization is facilitated by polar amino acids in the dimerization domains.