A parent calls the pediatrician's office about uncomfortable sores on the inside of her child's mouth. You suspect hand, foot, and mouth disease (HFMD), but need to rule out measles. Which information could help you to rule out measles?
A) vaccination history and other symptoms of illness such as fever and sore throat
B) other symptoms of illness such as fever and sore throat
C) presence of a rash on the face, trunk, and extremities
D) vaccination history
E) vaccination history, other symptoms of illness such as fever and sore throat, and presence of a rash on the face, trunk, and extremities
Answer: D
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The function of a protein is dependent upon the shape into which the chain of amino acids folds. Many non-covalent interactions are responsible for maintaining the protein's shape. Assume you have isolated a protein from an organism in its proper shape
and you have treated it with an enzyme that selectively targets and breaks only the peptide bonds in the proteins. Would the protein retain its shape under these conditions? A. Yes; once the shape of a protein is formed, the peptide bonds are unnecessary. B. Yes; the non-covalent interactions are stronger than the peptide bonds. C. No; while the non-covalent bonds determine the shape of a protein, the peptide bonds are required to hold the amino acids together. D. Yes; but the shape would be affected to a greater extent by changes in temperature.
How do CAM plants minimize photorespiration?
A. Stomata are only opened at night, storing carbon dioxide in the stromata. During the day the carbon dioxide is released for photosynthesis. B. Stomata are only opened at night, storing carbon dioxide in malate. During the day the carbon dioxide is released for photosynthesis. C. The light reactions and the Calvin cycle occur in different cells, so oxygen does not come into contact with rubisco. D. Stomata are only opened at night, storing oxygen in malate. During the day the oxygen is released for photosynthesis. E. The light reactions and the Calvin cycle occur in different cells, so carbon dioxide does not come into contact with rubisco.
__________ cover the body surface, and line its internal spaces. Fill in the blank(s) with the appropriate word(s)
Based on molecular evidence, how long have fungi been present on land?
a. at least 125 million years b. at least 250 million years c. at least 500 million years d. at least 760 million years