Using microbes to break down or remove toxic wastes in water and soil is called
A. synergism.
B. recycling.
C. mineralization.
D. bioremediation.
E. decomposition.
Answer: D
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An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme extracted from cell culture. Both enzymes were examined and have identical amino acid composition. What is the best explanation for the lack of activity of the synthesized enzyme?
A) The van der Waals radius was altered during laboratory synthesis. B) The synthetic enzyme was not made of amino acids. C) The ATP required for self-assembly was present in the cell extract but not in the laboratory synthesis. D) Denaturation of the synthesized enzyme was not complete. E) The synthesized enzyme was not folded correctly because molecular chaperones were not present.
Sickle cell anemia is a recessive trait in humans. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the sickle cell allele, what is the probability that all of their first three children will be unaffected?
A) 1/4 B) 1/2 C) none D) 1/8 E) 1/16
The driving force for heart contraction is
a. contraction of the atria. b. contraction of the ventricles. c. closing of the AV valves. d. opening of the AV valves. e. closing of the aortic valve
Which of the following terms BEST describes the scientific method?
A. process B. event C. communication D. sequential