Pathogenic staphylococci inhibit neutrophil chemotaxis, phagocytosis, and the action of vancomycin by the production of ________.
A. leukocidins
B. slime
C. hemolysins
D. a capsule
Answer: B
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Which of the following conclusions can be made if two identical insertion sequences are identified in separate locations on a chromosome?
A. The insertion sequence was transferred via simple transposition. B. The insertion sequence was a "cut-and-paste" transposon. C. A mutation occurred during transposition of the insertion sequence. D. The insertion sequence was transferred via replicative transposition.
Aquaporins are ____
a. pores made of water molecules b. proteins utilized to transport water molecules c. found only in bacterial cells d. specific channels for water transport e. useful for cell signaling
Four of the following statements about turtles are true. Which statement is false?
a. About 300 species of turtles currently exist. b. Turtles do not have teeth. c. Turtle shells are enlarged in marine forms. d. Turtles must return to land to lay eggs. e. Most sea turtle species are highly endangered.
Which hypothesis was rejected by the evidence from radiometric dating of nonfossil rocks?
A) static hypothesis B) transformation hypothesis C) separate type hypothesis D) common descent hypothesis