A person with narcolepsy may experience
A) cataplexy, in which he or she suddenly collapses.
B) dogaplexy, in which he or she suddenly collapses.
C) inability to sleep.
D) excessive REM sleep.
A) cataplexy, in which he or she suddenly collapses.
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Hinge joints allow movement in two dimensions (flexion and extension). Which of the following is an example of a hinge joint?
A. the hip joint B. the joints between bones of the skull C. the elbow D. the shoulder joint
The total number of deaths in a population due to a disease is the ________ rate.
A. mortality B. endemic C. pandemic D. incidence E. morbidity
A molecular biologist is interested in purifying a recombinant protein by His-tagging, but the protein and vector both lack histidine residues. In this case, the molecular biologist could use which of the following technique(s) to achieve purification?
A. Add a 6xHis-tag to the C-terminus of the protein B. Amplify the histidine-encoding sequence by PCR and add it to the gene of interest C. Add a series of histidine residues to the N-terminus of the protein D. All of the choices are correct.
Radioactive iodine (131I) is commonly used in medical situations for diagnosing and treating thyroid conditions. The most common isotope of iodine that is not radioactive is 127I. Chemically, what is the difference between 127I and 131I? What do they
have in common? What will be an ideal response?