Which staphylococcal infection is not correctly matched with its description?
A) Scalded skin syndrome: Caused by the production of an exfoliative toxin
B) Impetigo: Presence of pus-filled vesicles on the face, lips, or extremities, usually in children
C) Erysipelas: A milder form of impetigo with only localized inflammation and mild pain
D) Folliculitis: Swollen, red, pus-filled hair follicles
E) Cellulitis: Deep infection of the lower dermal and subcutaneous fat
Answer: C
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Thalidomide, an anticonvulsive and antihistamine medication, was shown to cause severely deformed limbs in children whose mothers took the medication. What might thalidomide do during development?
A. Cause a defect in the fertilization of an egg. B. Severely alter blastulation in the embryo. C. Impair morphogenetic fields within the embryo. D. Impair neural tube formation. E. Block cell division during blastulation.
Approximately what fraction of flowering plants is polyploid?
a. 1% b. 10% c. 25% d. 50% e. 80%
All of the following statements help to explain why water molecules form hydrogen bonds except:
a. Water is an electronegative molecule. b. The electrons spend more time around the oxygen atom because oxygen is more electronegative than hydrogen. c. There is a partial positive charge on each hydrogen atom and two partial negative charges on the oxygen atom in a water molecule. d. Attractions form between opposite partial charges.
Enzymes increase the rate of a reaction by increasing molecular motion, thereby providing kinetic energy to drive the reaction.
Answer the following statement true (T) or false (F)