Vessel elements must be thinner and shorter than tracheids because they lack the structural integrity to support large angiosperm trees
A. true
B. false
B
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Which hormone sets the body's basal metabolic rate?
A. estrogen B. insulin C. norepinephrine D. cortisol E. thyroxin
Which type of microscope can be used to observe living cells and tissues?
a. LM b. TEM c. SEM
In 1928, Frederick Griffith's experiments with Streptococcus pneumoniae suggested that
A) bacteria do not incorporate the DNA of other bacteria. B) attenuated R (rough) bacteria easily revert to the wild type (virulent). C) RNA was the genetic material. D) heat-killed bacteria could somehow "transform" live bacteria. E) protein was the genetic material.
The epithelial cells lining the intestine have surface projections that increase the area for absorption. These projections are called ________
A) villi B) mucus C) microvilli D) bile