Water is capable of rising to the tops of the tallest trees due to all of the following except:a
the hydrogen bonds among water molecules.
b. the cohesiveness of water molecules.
c. the adhesion of water to the walls of xylem cells.
d. the evaporative pull of transpiration.
e. root pressure
E
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What was the significance of the 1978 finding by Philip Leder's research group that the 0.7 kb ?-globin mRNA is not colinear with the gene that encodes it, but the nuclear 1.5 kb pre-mRNA is?
What will be an ideal response?
The function and structure of the vertebral column include all of the following except:a
provide for flexibility. b. protect the spine. c. allow passage of the spinal nerves. d. increase stability of the body from the neck to the lower back. e. form the pectoral girdle.
It is difficult to estimate current rates of extinction, but we know that extinction rates have risen dramatically in recent years because
A) the fossil record is unreliable. B) current rates of extinction are much higher than that of background rates. C) new species are evolving as fast as species are becoming extinct. D) background extinction rates have increased. E) most species in danger of extinction are microscopic.
Which of the following may result from eating tuna sashimi (raw fish)?
A. botulism B. norovirus infection C. polio D. salmonellosis E. saxitoxin intoxication