__________ infections are always caused by physicians or other healthcare workers.
A) iatrogenic
B) community-acquired
C) nosocomial
D) contagious
A) iatrogenic
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Which of the following lacks sufficient penetrating power for bulk sterilization?
A. Alpha and beta particles B. Gamma radiation C. Ultraviolet (UV) radiation at 260 nm D. X rays
The following list of products is from which portion of aerobic cellular respiration? 8 NAD+ 32 ATP 4 FAD 12 H2O
A. glycolysis B. Krebs cycle C. electron transport system D. fermentation
The lactose analog isopropyl-beta-D-thio-galactoside (IPTG) is often used to regulate gene expression systems in bacteria. IPTG does not act as a substrate for beta-galactosidase but can bind to, and inactivate, the repressor. In this case, IPTG serves as a(n)
A. DNA-binding protein. B. repressor. C. inducer. D. operon.
How do changes in histone modifications lead to changes in chromatin structure?
(a) They directly lead to changes in the positions of the core histones. (b) They change the affinity between the histone octamer and the DNA. (c) They help recruit other proteins to the chromatin. (d) They cause the histone N-terminal tails to become hyperextended.