Members of a protein family often contain the same folding domain
a. true
b. false
Ans: a. true
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Bacterial resistance to penicillin began to appear ____
a. several decades after its first use b. 100 years after its first use c. after the drug was developed from synthetic sources d. during the AIDS outbreak in the 1980s e. within a few years of its introduction into general use
How many distinct evolutionary branches exist in the domain Archaea, as revealed by genome sequencing studies?
a. two b. three c. four d. five e. at least six
What role do rhizoids perform in mosses?
a. They structurally support the sporophyte stalk. b. They anchor the gametophyte. c. They take up water. d. They absorb nutrients. e. They act as a root underground.
The only source of all new alleles is:
a. natural selection. b. genetic drift. c. gene flow. d. mutation. e. genetic polymorphism.