The embryo is designated a fetus by which week of pregnancy?
a. eighth
b. twelfth
c. sixteenth
d. twentieth
e. twenty-fourth
A
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Endosymbiosis of cyanobacteria is widely accepted as an explanation for the development of chloroplasts. The presence of endosymbiotic cyanobacteria provided a cell with the advantage of ________.
A. a membrane-bound nucleus B. tolerance to oxygen C. an electron transport chain D. simple, rapid gene transfer E. photosynthesis
What do the bacteria living in root nodules
supply to their host plant?
a. nitrogen b. phosphorous c. oxygen d. sugars e. more than one of these
How could you possibly become infected with adult tapeworms?
a) wading in contaminated water b) ingesting eggs in contaminated water c) eating freshly peeled fruit d) being bitten by a mosquito e) eating insufficiently cooked pork
How do group A streptococci camouflage themselves from white blood cells?
A. they produce coagulase, allowing the bacteria to hide within blood clots. B. they grow in chains or pairs. C. they produce streptokinase, which breaks down blood clots. D. they have hyaluronic acid capsules. E. they have a coating of protein M.