Klinefelter syndrome in humans, which leads to underdeveloped testes and sterility, is caused by which chromosomal condition?
A) 45, X B) 47, 21+ C) triploidy D) 47, XXY E) 47, XYY
D
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Extracellular matrix is made up of
a. polysaccharides and fibrous proteins. b. fibrous proteins and lipopolysaccharides. c. polysaccharides and lipopolysaccharides. d. fibrous proteins and complex lipids. e. polysaccharides and complex lipids
Which is the most common protein in the body?
a. muscle b. collagen c. hemoglobin d. bone matrix e. insulin
What is the largest single source of radiation exposure for the average person in the U.S.?
a. radon b. medical X-rays c. cosmic d. nuclear medicine e. consumer products
The reason water is polar is because
A. hydrophilic molecules interact with water. B. in polar molecules atoms share electrons evenly. C. there is a transfer of electrons from the hydrogen to the oxygen. D. the electrons spend more time circling the oxygen atom than the hydrogens. E. hydrophobic molecules do not interact with water.