An American College Health Association snapshot profile of college students and STIs indicates that ____ percent have been vaccinated against human papillomavirus (HPV)
a. 1.3
b. 25.3
c. 44.0
d. 51.6
e. 68.0
e
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Which effect of excess body fat can increase cancer risk?
A. Increased levels of epinephrine B. Decreased levels of insulin-like growth factor-1 C. Increased levels of insulin D. Lowered inflammation E. Lowered estrogen levels
Uterine bleeding not caused by menstruation is called
A) menorrhea. B) dysmenorrhea. C) metrorrhagia. D) menorrhagia.
_____ of Fallot is one of the most serious of the congenital heart defects and consists of four abnormalities
Fill in the blank with the right word.
You are going to use flow cytometry to determine the proportion of developing B cells in the bone marrow that are immature, anergic, or mature. You have three monoclonal antibodies specific for three different B-cell surface proteins
The first has specificity for the cell-surface protein CD19, which is expressed by all developing and mature B cells; the second is specific for the Fc region of IgD; and the third is specific for the Fc region of IgM. The antibodies are conjugated to three different fluorescent tags that can be detected and distinguished by the flow cytometer. A. Use histograms to show your analysis of CD19-positive cells and indicate which part of your histogram you would gate to analyze IgM and IgD expression. Indicate the gated population with an arrow. B. Using a two-dimensional dot plot, compare the expression of IgD and IgM of these gated cells, and say which of these populations represents (i) immature B cells, (ii) mature B cells, and (iii) anergic B cells.