Systematists often use DNA sequencing in ______________, the study of the order of evolutionary events within a group sharing derived characters.
Fill in the blank(s) with the appropriate word(s).
cladistics
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Which of the following is not true of the regulation of the arabinose operon?
A. CRP activates expression when bound to cAMP. B. AraC protein recruits RNA polymerase when bound to arabinose. C. Arabinose binds to AraC protein, decreasing its affinity for a DNA site near the promoter. D. Arabinose binding alters the conformation of the dimerization domain of the AraC protein.
_______can be characterized as any deviation from the healthy state
a. pathology b. inflammation c. disease d. infection
Which of the following statements regarding the Epstein-Barr virus is incorrect?
A. An infection results in sudden leukocytosis. B. An infection typically requires hospitalization for about a week. C. The virus is transmitted by direct oral contact and saliva. D. The virus has a 30-50 day incubation period. E. Transmission has been documented through contaminated blood transfusions and organ transplants.
You treat some cells with a proteolytic enzyme that is too large to penetrate the cell membrane (Set 1). Another group of cells is made permeable to the enzyme before treatment with the enzyme (Set 2). A third set of cells was NOT treated with the enzyme at all (controls). Proteins are then extracted from the three different sets of cells and applied to an SDS-PAGE gel. Protein W migrates to the same distance on a gel of proteins from Set 1 and Set 2; Protein W migrates a shorter distance on gels of proteins extracted from the control group than on gels of proteins extracted from Set 1 and Set 2 treated cells. Protein X migrates to the same distance on a gel of proteins from control cells and the gels of the proteins from Set 1 and Set 2. Protein Y migrates a longer distance when
extracted from Set 1 cells than does protein Y in the controls; Protein Y moves an even larger distance in the gel of the extracts from Set 2. Protein Z migrates the same distance on gels of proteins from the controls and the proteins extracted from Set 1, but it migrates a longer distance in extracts from Set 2 cells. Which protein is exposed only on the exterior of the cell? a) protein X b) protein Z c) protein Y d) protein W