Capillary action depends upon the force of
A. adhesion only
B. cohesion only
C. both transpiration and adhesion
D. both adhesion and cohesion
Ans: D. both adhesion and cohesion
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You grow two trays of Arabidopsis plants under identical conditions, except that one tray of plants is exposed to a gentle breeze for several hours each day
Compared to plants grown in calm conditions what would you expect to see in the wind-exposed plants? I. changes in the expression of many genes II. taller flower stalks III. shorter flower stalks IV. more flexible cell walls V. no changes in 2nd messengers VI. increases in 2nd messengers and/or phosphorylated proteins VII. increased levels of Pfr VIII. stiffer cell walls. A) I, III, VI, VIII B) II, IV, V, VII C) III, IV, VII D) VI, VII, VIII E) wind has no effect on plant development
The bony movable ?ap that covers the gills and gill slits is called the
(a) operculum. (b) cranium. (c) tympanum. (d) colon.
Many rats were tested for their ability to learn to navigate a maze. The average number of errors, for a total of 14 trials, was 64 per rat. The rats that made the fewest errors were bred to each other, and the offspring were tested in a similar way
This process was repeated for seven generations, at which point the average number of errors for 14 trials was 36. This experiment demonstrates that A) learned behavior cannot be inherited. B) maze-learning ability has a genetic basis. C) maze-learning ability depends mainly on early contact with adept parents. D) natural selection has a role in the evolution of fixed action patterns but not in the evolution of behavior involving learning.
A 30-year-old woman was hospitalized after she experienced convulsions. On examination, she was alert and oriented and complained of a fever, headache, and stiff neck. Which of the following is most likely to provide rapid identification of the cause of her symptoms?
A) Gram stain of cerebrospinal fluid B) Gram stain of throat culture C) biopsy of brain tissue D) check serum antibodies E) None of these would provide rapid identification.