The vitreous humor fills the main chamber of the eye. Which one of the following structures of the eye would vitreous humor come in direct contact with?
A) sclera
B) cornea
C) iris
D) choroid
E) retina
E
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The original three components of the cell theory are that all organisms
A. have DNA, DNA is the fundamental unit of life, and all cells come from preexisting cells. B. are made of one or more cells, the cell is the fundamental unit of life, and all cells come from preexisting cells. C. are made of one or more cells, the cell is the fundamental unit of life, and all cells have a nucleus. D. have DNA, are made of cells, and all cells produce proteins. E. are made of one or more cells, all cells contain DNA, and all cells come from preexisting cells.
Oncogenes encode proteins in each of the following categories except
A) growth-factor receptors. B) nonreceptor protein kinases. C) transcription factors. D) cytochrome P450 enzymes. E) growth factors.
Spindle fibers are formed during
A. Transcription B. Cell division C. Aerobic respiration D. Protein synthesis E. Photosynthesis
Which of the following is a cause of drug-specific resistance in disease-causing organisms?
A) inappropriate hygiene B) nosocomial infection C) poor immunity D) indiscriminate nonmedical use of antimicrobials