Swelling, redness, heat, and pain are all manifestations of:
a. nosocomial infection.
b. inflammation.
c. bacterial colonization.
d. coagulation.
B
Inflammation is a system that has both cellular and biochemical components that interact in var-ious ways to fight microbial invasion in the human body.
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Which of the following statements about marine bony fish is false?
A. Chloride cells in the gills actively pump chloride ions into the body. B. They maintain a body fluid solute concentration that is lower than that of the surrounding seawater. C. They drink water to replenish water supplies. D. They are osmoregulators. E. They tend to lose water through osmosis.
When a neuron membrane potential becomes less negative it becomes
a. depolarized. b. hyperpolarized. c. repolarized. d. damaged. e. activated above the threshold potential.
Subtelomeres are blocks of homologous DNA sequences close to the ends of chromosomes
In a worldwide population of humans, when sequences of chromosomes 4q and 10q subtelomeres were analyzed only 17 4q and 8 10q haplotypes were found among African, European, and Asian groups. Which of the following might be among the results or conclusions of this analysis? A) finding that few or no interchromosomal exchanges can occur among these chromosomes B) a conclusion that all haplotypes were present before the human population migrated from Africa C) reporting that haplotype polymorphism shows no response to natural selection D) finding greater than 80% variation between homologous ends of chromosomes in humans E) a conclusion that assigning chromosomal origin of repeat arrays by using specific restriction enzymes is possible only in a population with the same ethnic origin
In some species, sex determination is influenced by environmental temperature during development. If you wanted to determine the temperature at which one would obtain a 1:1 sex ratio in a particular species of turtle, which of the following experiments would best address this question?
A. Grow the turtles in three different incubators at temperatures of 26ºC, 28ºC, and 30ºC. B. Grow the turtles in five different incubators at temperatures of 22ºC, 24ºC, 26ºC, 28ºC, and 30ºC. C. Grow the turtles in two different incubators at temperatures of 22ºC and 30ºC. D. Grow the turtles in four different incubators at temperatures of 24ºC, 26ºC, 28ºC, and 30ºC.