Heart valves prevent backflow of blood
Indicate whether the statement is true or false
True
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The process of gene rearrangement in immunoglobulin and T-cell receptor genes is called
a. somatic hypermutation b. isotype switching c. somatic recombination d. apoptosis e. clonal selection.
Among the 1.2 million people in the United States infected with HIV, about _____ of them are unaware of the infection
a. 20% b. 30% c. 50% d. 70%
Answer the following statement(s) true (T) or false (F)
1. An elementary physical education teacher must be licensed to teach. 2. The director of a cardiac rehabilitation program must be certified as a personal trainer. 3. College coaches must have earned at least a master’s degree. 4. Personal lifestyle preferences have nothing to do with choosing a career.
An estimated __________ percent of Americans suffer lower back pain at some time in their lives.
A. 20 B. 45 C. 60 D. 80 E. 95