Which of the following is an intracellular
parasite that causes sexually transmitted
disease?
a. Chlamydia
b. Cyanobacteria
c. Clostridium
d. Chondromyces
e. all of these
A
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Which of the following is most likely to share electrons with other atoms in joint orbitals?
a. chlorine (7 valence electrons) b. calcium (2 valence electrons) c. argon (8 valence electrons) d. carbon (4 valence electrons) e. potassium (1 valence electron)
A student is shopping for antibacterial hand cleansers and is trying to decide which one to buy. One is a "waterless" hand gel containing 70% isopropanol, the second is an "antibacterial" hand soap containing triclosan (a phenolic), and the third is a
wipe that lists benzethonium chloride (a synthetic quaternary ammonium salt) as the active ingredient. Compare and contrast these cleansers in terms of the action of the antimicrobial ingredient and the level of disinfection (degerming, germistatic, germicidal). What will be an ideal response?
The mechanism that allows many Na+ ions to move into the axon is
A. negative feedback. B. positive feedback. C. equilibrium feedback. D. None of the choices are correct.
The rod and cone cells are located within which layer of the eye?
A. retina B. choroid C. lens D. iris E. sclera