Discuss factors that must be taken into account when setting standards for safe levels of exposure to potentially harmful chemicals in the environment. Explain why setting these standards is such a complex task
What will be an ideal response?
Setting standards for safe levels of exposure to potentially harmful chemicals must take into account population differences in allele frequencies, genotype frequencies, and differences in the amount of a particular detoxifying enzyme present in cells to ensure that the most sensitive members of the population, especially newborns and infants, are sufficiently protected. The many alleles for all the genes carried by each individual is the result of the random combination of parental genes and the sum of changes brought about by recombination and mutation. This genetic combination confers a distinctive phenotype upon each person. Understanding the molecular basis for this individuality remains one of the great challenges of human biochemical genetics.
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Which form of transport requires the expenditure of energy?
A. Active transport B. Facilitated diffusion C. Osmosis D. Passive transport
Angiosperms are the most successful terrestrial plants. Which of the following features is unique to them and helps account for their success?
A) wind pollination B) dominant gametophytes C) fruits enclosing seeds D) embryos enclosed within seed coats E) sperm cells without flagella
The hierarchy of life extends past individual organisms. Which of the following is the correct sequence, from least inclusive to most inclusive, following an individual organism?
A. population - ecosystem - community - biosphere B. community - population - ecosystem - biosphere C. population - community - ecosystem - biosphere D. community - population - biosphere - ecosystem E. ecosystem - population - biosphere - community
Compare and contrast the advantages and disadvantages of gas exchange in terrestrial and aquatic
environments. What will be an ideal response?