What antibiotic is mixed with neomycin and polymyxin to make an antibiotic ointment (Neosporin) for superficial skin infections?
A. Chloramphenicol
B. Vancomycin
C. Bacitracin
D. Clindamycin
E. Streptomycin
Answer: C
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Lipids are the only class of macromolecules that contain:
A. amino acids. B. nucleotides. C. fatty acids. D. phosphate groups. E. monosaccharides.
Instability of radioisotopes is caused by
a. sudden temperature variations. b. environmental humidity. c. the random motion of atoms. d. the disintegration of a neutron into a proton and an electron. e. the motion of electrons and neutrons.
Bones are held together at joints by
a. tendons. b. intercellular junctions. c. ligaments. d. cartilage. e. collagen.
Individuals who are __________ for sickle cell hemoglobin tend to be __________ resistant to
falciparum malaria, but do not experience the effects of sickled red blood cells. a. homozygous dominant; more b. homozygous dominant; less c. homozygous recessive; less d. heterozygous; more e. heterozygous; less