A negative charge is characteristic of a(n)
A. positive ion.
B. electron.
C. neutron.
D. proton.
B. electron.
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Sulfur metabolism is a common trait in Deltaproteobacteria
Indicate whether the statement is true or false.
The transformation of humans from hunter-gatherer societies to agriculturally based ones occurred
approximately _____.
a. 14,000 years ago b. 11,000 years ago c. 7,000 years ago d. 1,500 years ago e. 200 years ago
Segments of polypeptides that are retained following protein splicing are called
A) introns. B) exons. C) inteins. D) exteins. E) cleavage products.
Reptiles are better adapted to life on land than are amphibians. Which external characteristic would a reptile have to lose to make it roughly externally equivalent to an amphibian in terms of ability to tolerate dry land?
A. limbs B. eyelids C. vertebral column D. scales