Old man's beard (Usnea trichodea) and yellow Evernia lichens are sensitive to elevated levels of
a. sulfur dioxide (SO2).
b. nitrogen oxides.
c. nitrate.
d. sunlight.
e. fluoride salts.
A
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Vertebrate lungs probably evolved from simple outpocketings of the digestive tract of a freshwater fish
Indicate whether the statement is true or false
In order for a colony to be visible to the naked eye, about how many cells must be present?
a. 1,000,000 b. 100,000 c. 10,000 d. 1,000
The atomic number equals the number of ________ in an atom.
A. protons plus electrons B. neutrons plus protons C. protons D. neutrons
Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for two generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one light and one half-heavy band B. one half-heavy (intermediate to heavy and light) band C. one heavy band D. one heavy and one half-heavy band E. one light band