In former times, surgeons used small doses of curare to relax the patient's abdominal and other muscles during operations
Why did this compound work? What additional precautions do you think the medical staff needs to put into place when a patient is under anesthesia?
Curare prevents acetylcholine from connecting to muscles. Since the diaphragm is likely to stop working, patients may stop breathing because of this, so assisted breathing devices are usually used.
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Zach undergoes a sperm analysis and is upset to learn that he has oligospermia. This means that
A) he has cancer of the spermatogonia, and his sperm will never mature. B) he makes too many sperm, and they will crowd and kill each other. C) he makes too few sperm, lowering the probability of one sperm successfully reaching and fertilizing an oocyte. D) his sperm have two heads, each of which contains an entire genome of DNA, making them too heavy to swim to an oocyte.
Variation is usually introduced by the process of _________?
a. random fertilization
b. mutation
c. random mating
d. recombination between homologous chromosomes during meiosis
e. all of the above
Predators often avoid a mimic species because of
a. its bad taste. b. its toxic secretion. c. its resemblance to a model species. d. its painful sting. e. all of these.
The common ancestor of sponges and other animals was probably
A) multicellular with tissues but without organ systems. B) multicellular with tissues and many organ systems. C) unicellular. D) multicellular without tissues. E) multicellular with tissues and a few organ systems.