Which microscope can be used to visualize DNA or botulinum toxin?
A) compound light microscope
B) phase-contrast microscope
C) scanning tunneling microscope
D) confocal microscope
E) scanning electron microscope
C
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Individuals with an XXY karyotype are ________ in humans and ________ in fruit flies.
A) male; male B) male; female C) female; male D) female; female E) male; intersexual
A fetus who is Rh ________ has the greatest risk of an Rh incompatibility when the mother is Rh ________
a. - / + b. + / + c. - / -s d. + / -
The urinary system ________.
A. filters toxins out of the bloodstreams B. maintains water balance in the body C. produces and excretes urine D. all of the above are roles of the urinary system
Ammonia-oxidizing bacteria play an essential role in the nitrogen cycle by ____
a. converting ammonia into nitrogen oxides b. converting ammonia into nitrites c. converting ammonia into ammonium d. converting nitrites into ammonia e. converting nitrites into nitrogen oxides