After falling down a flight of stairs, it feels like you broke your ankle; however the emergency room doctor says you tore a ligament. This means you tore the
A) connective tissue band that attaches muscle to bone.
B) the cartilage in your ankle joint.
C) insertion of a muscle.
D) connective tissue band that joins two bones.
E) delicate membrane that covers the surface of the bone.
D
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This animal has the fewest genes, the simplest
body plan, and only four cell types. It is a
a. planarian. b. placozoan. c. annelid. d. roundworm. e. sponge
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.
A(n) ____________________ is made up of a sugar, a phosphate, and a nitrogenous base. Fill in the blank(s) with the appropriate word(s)
Much has been learned about the relationship between genes and gene products through the use of the mold Neurospora. What specific attributes make Neurospora a good organism for such studies?
What will be an ideal response?