Which of the following plant cells has a companion cell?
a. tracheids
b. vessel elements
c. sieve elements
d. sclereids
e. fibers
ANSWER: c
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What products would be expected to form during anoxic degradation of the seven-carbon compound benzoate following reduction and cleavage of the aromatic ring?
A) 1 three-carbon compound and 1 four-carbon compound B) 1 three-carbon compound and 2 two-carbon compounds C) 2 three-carbon compounds and CO2 D) 3 two-carbon compounds and CO2
In general, species richness follows a longitudinal gradient
Indicate whether the statement is true or false.
A serious concern about gene therapies and their commercialization is ________
A) the ease of achieving regulatory approval B) their cost to the consumer C) their speedy development process D) the lack of individuals treatable with the drug
Which of the following sources of alternative energy involves using uranium or other materials to split the nucleus of an atom?
A. hydroelectric energy B. wind turbines C. nuclear energy D. geothermal energy