Which of the following is true of fragile X syndrome?
A. It occurs only in females.
B. It occurs more frequently in males than in females.
C. It makes a female XO instead of XX.
D. It results in XXY males.
Answer: B
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_____ are specialized molecules released by metabotropic receptors that may open ion channels and may initiate the synthesis of second messengers
a. Beta-blockers b. Anandamides c. G proteins d. Monoamines
The ectoderm becomes the __________
A) muscles and skeleton B) nervous system and skin C) circulatory system and other internal organs D) digestive system, lungs, urinary tract, and glands
The Grant Technical High School has been using computer-assisted instruction (CAI) for the last ten years. It is likely that CAI has been used primarily as a tool to
a. teach programming skills to high school students. b. provide tutorial information and drill-and-practice exercises. c. promote critical thinking and problem-solving skills. d. encourage spatial abilities through the use of graphics and pictorial images.
According to data gathered in the National Health and Nutrition Examination Survey, in 1976-1980 about ___ percent of U. S. teenagers were obese; in 2007-2010 this percentage was ___ percent
a. 5; 10 b. 10; 5 c. 25; 55 d. 5; 18