The most common of all nosocomial infections are ________ infections
A) blood
B) reproductive tract
C) urinary tract
D) respiratory tract
Answer: C
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Dennis had a history of heart disease in his family and was reducing his intake of saturated fats. Saturated means each carbon atom is bonded to as many hydrogen atoms as it can accept. If a carbon were bonded to two carbons, how many hydrogens could it accept?
A. 0 B. 1 C. 2 D. 3 E. 4
Which of the following is not an example of symbiotic nitrogen fixation?
A. Anabaenea with a water fern B. Rhizobium with leguminous plants C. Azotobacter with certain photosynthetic protists D. Frankia with woody shrubs
Fatter sociable weaver birds spend more time foraging where they are vulnerable to predation, are more attractive to
predators, and are less likely to escape an attack. Conversely, thin birds risk starvation. Therefore, sociable weaver of an intermediate weight have a selective advantage. This is an example of ____ selection.
a. frequentb. directional c. disruptive d. stabilizing e. mutational
What does a mutagen cause?
A. problems with mitosis B. a reduction in the number of tRNA molecules available for protein synthesis C. decreased permeability of the nuclear envelope D. a change in the sequence of DNA E. decreased enzyme activity throughout the cell