"Striated" is a description that could apply to which kind of animal tissue?
a. Epithelium
b. Nervous
c. Skin
d. Muscl
e. Connective
Answer: d. Muscl
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Hans Spemann and Hilde Mangold conducted pioneering experiments in which they transplanted the dorsal lip of the blastopore in an early gastrula newt to the ventral side of another early gastrula newt. What was the outcome of this experiment?
A. Discovery of Spemann's organizer. B. The development of dorsal structures (neural tube, notochord) on both the dorsal and ventral parts of the gastrula that received the transplant. C. Identification of a morphogenic field in the dorsal lip of the blastopore of an early gastrula. D. Discovery of a group of embryonic cells in the dorsal lip that ultimately produce specific body structures. E. All of the choices are correct.
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.
Plasmids of bacteria often have genes involved in:
a. motility. b. reproduction. c. viral resistance. d. photosynthesis. e. antibiotic resistance
Muscles used for activities that require fine motor control, such as holding and writing with a pencil, have
A) motor units consisting of many muscle cells. B) access to large amounts of ATP. C) many neuromuscular junctions. D) motor units consisting of only a few muscle cells.