Answer the following statements true (T) or false (F)
1. Most of the pathogens involved in nosocomial infections come from the patients themselves.
2. An infection that results from urinary catheterization would be considered an iatrogenic infection.
3. Bacteria are the only pathogens that have become drug resistant.
4. A patient with tuberculosis should be placed in protective isolation.
5. A superinfection with Clostridium difficile could lead to diseases such as antibiotic-associated diarrhea and pseudomembranous colitis.
1. TRUE
2. TRUE
3. FALSE
4. FALSE
5. TRUE
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The histone octamer forms a tightly packed particle, but the N-termini that protrude from the octamer are less ordered. Which is the best explanation for this observation?
A. The charges on the amino acid residues in the N-terminal tails are primarily acidic and repel each other. B. The charges on the amino acid residues in the N-terminal tails are primarily basic and flex to accommodate the DNA. C. The N-terminal tails must be flexible because they bind to and then release DNA during transcription. D. The N-terminal tails must be more flexible because they form intermolecular contacts with other nucleosomes. E. The N-terminal tails must be more flexible because they interact within the minor groove of DNA.
Cells that undergo amoeboid movement have an outer layer of thick, gelatinous cytoplasm called the ________ and an inner layer of more fluid cytoplasm called the ________.
A) ectoplasm; endoplasm B) lamellipodium; pseudopodium C) gelation layer; solation zone D) protoplasm; proplasm E) outer jelly; inner soup
Which specimen culture, if positive, should be immediately reported to the clinician?
a. Urine b. Blood c. Throat d. Stool
The breast muscle of turkeys and chickens is usually referred to as light meat, whereas that of wild ducks and geese is described as dark meat. How might this be explained?
A. Turkeys and chickens are not closely related to ducks and geese. B. Turkeys and chickens do not fly for sustained periods, whereas wild ducks and geese do. C. The muscles of ducks and geese do not contain myosins. D. The darker body color of ducks and geese provides protective camouflage against predators.