Which of the following statements is not true about work researchers have done to determine how large the forces are that allow leaves to pull water from the soil?
A. They measured the rate at which water
flowed from a reservoir to the cut tip of a
branch of an actively transpiring plant.
B. They compared the cut tip of a branch and
a vacuum pump.
C. They used reverse osmosis to measure
the magnitude of suctions exerted by plant
leaves.
D. They found that at very long transport
lengths a vacuum pump can pull more water
than a plant xylem.
E. They found that leaves higher on the stem
exert more force than leaves closer to the
ground.
D
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In eukaryotes a series of ________ residues are added to the 3' end of an RNA molecule as part of the posttranscriptional processing used to produce functional mRNA.
A. cytosine B. uracil C. adenine D. guanine
Which genetic condition has an X-linked recessive inheritance pattern?
a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis
If a round cell doubles in size, its volume increases
about __________ times while its surface area increases about __________ times. a. 2; 4 b. 4; 16 c. 8; 64 d. 8; 4 e. 16; 8
A transverse plane is indicated by
a. A. b. B. c. C. d. D. e. E.