Microbial oxidation can be used to recover ALL of the following metals EXCEPT
a. copper.
b. uranium.
c. gold.
d. molybdenum.
Answer: D
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A graduate student is trying to isolate bacterial mRNA for an enzyme that will degrade trinitrotoluene (TNT)
She's frustrated to find that the enzyme isn't produced when the bacterium in question is grown on nutrient agar. What might she do to solve the problem and obtain the mRNA? A. Add nitrogen and toluene to the agar to drive up synthesis of TNT. B. Add TNT to the agar-this will drive synthesis of the enzyme to degrade it, leading to production of the mRNA the student is looking for. C. Remove glucose from the agar-this will cause the bacteria to shift to other compounds for their energy purposes. D. Remove all sugars from the agar-this will cause the bacteria to shift to other compounds for their energy purposes. E. Add TNT to the agar-this will drive synthesis of the enzyme to degrade it, leading to production of the mRNA the student is looking for AND remove all sugars from the agar-this will cause the bacteria to shift to other compounds for their energy purposes.
Which of the following colonize the vagina during childbearing years?
A. Streptococci B. Clostridium C. Lactobacilli D. Enterobacter E. Clostridium AND lactobacilli
Natural selection can maintain genetic variation by favoring heterozygous genotypes. In equatorial Africa, the best genotype to have for hemoglobin is heterozygous (HbA / HbS). In the United States, there is no advantage to the heterozygous genotype. HbA codes for normal hemoglobin, whereas HbS codes for abnormal hemoglobin that causes red blood cells to become distorted in shape (sickle cell). Explain why the heterozygous state is advantageous in Africa, but not in the United States. What has happened to the sickle-cell allele in Africa? What has happened to the sickle-cell allele in the United States?
What will be an ideal response?
Because it is possible for a female to mate with multiple males, any of whom could be the father, male mammals and birds always:
a. invest more in the care of the offspring. b. be the choosier sex in mating. c. have some degree of paternity uncertainty. d. invest less in the care of the offspring. e. mate with kin that they can trust.