Which of the following processes is able to move
heat away from the body and is used by humans?
a. convection
b. evaporation
c. conduction
d. radiation
e. collection
Answer: b
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Touching your chin to your chest is an example of ____________________. Fill in the blank(s) with the appropriate word(s)
Which of the following structures places a fish in the class Actinopterygii?
a. swim bladder b. pharynx with gills c. nerve chord d. pelvic fin e. dorsal fins
A research lab is trying to produce new antibiotics. They come up with drugs that detach the hydrophilic heads from the phospholipids in plasma membranes. This drug
A. would be highly toxic and completely useless for human beings-we also have plasma membranes with hydrophilic head groups!
B. would be highly toxic only to bacteria, making it an excellent drug to develop and test further. Humans have a different phospholipid structure in their cell plasma membranes than bacteria.
C. would generally not be toxic enough to damage Gram-negative bacteria, as their plasma membranes lie under a thick layer of peptidoglycan.
D. would be highly toxic for human beings, but might be useful as a topical antibiotic skin cream. The top layer of skin cells is dead anyway, so it wouldn't matter if this damaged those cells. It could NOT be taken internally, though, by human beings.
The protein required for the establishment and maintenance of lysogeny in cells infected with the temperate bacteriophage lambda is the ________.
A. lambda repressor B. lambda cos C. lac repressor D. lambda Xis and Int proteins