The chemical agent(s) that produces highly reactive hydroxyl-free radicals and also decomposes to O2 gas is/are
A. Cidex.
B. chlorhexidine.
C. iodophors.
D. cationic detergents.
E. hydrogen peroxide.
Answer: E
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Scientists examined the diversity of primary and secondary consumers from intertidal communities in four regions of the world:
Benguela along the coast of South Africa (BEN), California along the coast of North America (CAL), Humboldt along the coast of Chile in South America (HUM), and New Zealand (NZ). The number of organisms per square meter (mean density), which is a unit that represents total biomass of primary consumers (herbivores) and secondary consumers (carnivores), is plotted for each of these four regions on the graph below. Note: Image from Blanchette et al. (2009). Trophic structure and diversity in rocky intertidal upwelling ecosystems: A comparison of community patterns across California, Chile, South Africa and New Zealand. Progress in Oceanography 83: 107-116. After examining the graph, complete the following sentence. The black portion of each bar represents the percentage of [primary / secondary] consumers, whereas the gray portion of each bar designates the percentage of [primary / secondary] consumers from the four intertidal communities. What will be an ideal response?
Antidiuretic hormone and oxytocin are products of
a. exocrine glands. b. secretory neurons c. blood capillaries. d. the anterior pituitary. e. kidney and uterine wall cells, respectively.
The sex of most mammals, birds, and insects is determined by:
a. the temperature. b. the external environment. c. sex chromosomes. d. chance. e. the internal envronment.
Hypophosphatemia (vitamin D—resistant rickets) is inherited as a sex-linked dominant trait. The relevant gene is found on the X chromosome
What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia? A) All of their daughters and none of their sons exhibit hypophosphatemia. B) Fifty percent of their daughters and fifty percent of their sons exhibit hypophosphatemia. C) All of their sons and none of their daughters exhibit hypophosphatemia. D) Twenty-five percent of their offspring exhibit hypophosphatemia.