Amniocentesis and chorionic villus sampling are two methods of prenatal diagnosis. One important
difference between these techniques is that
A. chorionic villus sampling is more routinely prescribed.
B. amniocentesis can diagnose chromosome disorders, while chorionic villus sampling
cannot.
C. chorionic villus sampling can be performed earlier than amniocentesis.
D. maternal risks are higher with chorionic villus sampling.
E. the risk of miscarriage is higher with amniocentesis than with chorionic villus sampling.
C
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Runoff of rainwater is minimized on
(a) hard surfaces like parking lots. (b) compacted ground. (c) level, spongy ground. (d) steep slopes.
Which of the following macromolecules is composed of amino acids?
A. lipids B. carboyhydrates C. nucleic acids D. proteins E. All of the choices are correct.
What causes a myosin II molecule to be able to form a bipolar fiber?
a. Myosin I b. Myosin-like chain kinase c. Calcium binding to calmodulin d. Two of the above e. Three of the above
As the Baby Boomer generation ages, more and more joint replacement surgeries take place each year. Hip replacement surgery is the gold standard of all joint replacement surgeries, with many patients able to walk just a few hours after surgery and return home the very next day. In contrast, knee replacement surgery usually requires hospital stays of several days, followed by weeks to months of physical therapy. What best explains why the recovery after hip replacement surgery is so much faster than after knee replacement surgery?
A. The hip only moves in one direction, and recovery of one motion is easier than recovering movement in many directions. B. The upper end of the thigh bone has less overall surface contact with the hip bone than its lower end has in the knee with bones of the lower leg. C. The knee is a type of combination joint, which are difficult to replace. D. The knee joint is stabilized by many more structures (many of which have to be cut) than the hip joint. E. The hip joint is more superficial and more accessible to surgeons than the knee joint.