Local edema, swollen lymph nodes, fever, soreness, and abscesses are indications of
A) A syndrome
B) Latency
C) Toxemia
D) Inflammation
E) Sequelae
D) Inflammation
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Which major regions compose the contemporary vertebrate brain?
A. rhombencephalon and prosencephalon only B. mesencephalon and rhombencephalon only C. prosencephalon and metencephalon only D. metencephalon, rhombencephalon, and prosencephalon E. rhombencephalon, mesencephalon, and prosencephalon
Absorbance at Various pH Levels
Time (sec) pH 4 pH 5 pH 6 pH 7 pH 8 pH 9 20 0.003 0.025 0.055 0.146 0.005 0.004 40 0.009 0.109 0.152 0.300 0.015 0.008 60 0.012 0.195 0.255 0.432 0.038 0.010 80 0.020 0.215 0.341 0.552 0.065 0.012 100 0.023 0.333 0.413 0.659 0.081 0.013 120 0.025 0.360 0.478 0.755 0.090 0.013 The accompanying table represents the results of an experiment where the effects of pH buffers on an enzyme found in saliva (amylase) were studied. A spectrophotometer set at 500nm was used to measure absorbance at the various pH levels every 20 sec for 2 min. The higher absorbance values would indicate greater enzyme activity. All experiments were conducted at the same temperature. Which statement correctly identifies the result that the optimum pH for amylase function is 7? A) The pH with the lowest absorbance values would indicate the optimum pH for amylase since this pH does not affect the structure or function of the protein. B) The pH with the highest absorbance values would indicate the optimum pH for amylase since this pH does not affect the structure or function of the protein. C) At pH 9, the enzyme is denatured and will lose its function, but not its structure. D) At pH 4, the structure of the enzyme will be altered, and the enzyme would not be able to catalyze the reaction.
Which of the following represents what Darwin thought of artificial selection?
a. He reasoned that if characteristics that better enable organisms to adapt to specific environmental pressures exist, then artificial selection will tend to increase those in succeeding generations. b. He reasoned that if a person could select different characteristics when breeding organisms, then nature could do so as well. c. Humans were selecting the characteristics they wanted in the offspring by choosing parents with those traits. d. Humans were selecting the characteristics they wanted in the offspring by eliminating individuals that did not s
Vaccinations were first invented using cowpox to protect against smallpox in the 1700s
a. true b. false