A scientist who examines the distributions of species around the world is most likely studying ____
a. taxonomy
b. paleobiology
c. biogeography
d. natural theology
e. natural history
ANSWER: c
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A bronchoscopy was performed on a patient who later developed a nosocomial infection as a result of the procedure. The organism recovered from his lung was a nonlactose fermenter that oxidized glucose and maltose, was lysine decarboxylase–positive, and was motile. The organism is most likely which one of the following?
a. Bordetella parapertussis b. Saccharolytic Acinetobacter c. P. luteola d. S. maltophilia
Linus Pauling demonstrated that:a
the structure of hemoglobin was altered by a mutation of a single gene. b. mutations only caused defects in enzymes. c. mutations alter the structure of RNA, but not proteins. d. mutations were inherited. e. the structure of hemoglobin was altered by mutations in any of a dozen genes.
If tennis players develop calcium deposits in their elbow joint, they will not be able to hit the ball
effectively. If musicians develop calcium deposits in their middle ear:a. they will not be able to detect any sound. b. they will have difficulty maintaining their balance. c. they will not be able to detect linear acceleration. d. they may have difficulty hearing soft sounds. e. they may have difficulty detecting direction when driving a car.
You are interested in cell-size regulation and discover that signaling through a GPCR called ERC1 is important in controlling cell size in embryonic rat cells
The Gprotein downstream of ERC1 activates adenylyl cyclase, which ultimately leads to the activation of PKA. You discover that cells that lack ERC1 are 15% smaller than normal cells, while cells that express a mutant, constitutively activated version of PKA are 15% larger than normal cells. Given these results, which of the following treatments to embryonic rat cells should lead to smaller cells? (a) addition of a drug that causes cyclic AMP phosphodiesterase to be hyperactive (b) addition of a drug that prevents GTP hydrolysis by G? (c) addition of a drug that activates adenylyl cyclase (d) addition of a drug that mimics the ligand ofERC1