Where does the copper used for wiring and plumbing come from?
A. Most copper is found in ocean sediments.
B. Most copper is mined from the ground.
C. Most copper is found along riverbanks.
D. All copper is mined from the surface.
E. All copper is manufactured synthetically in factories.
Answer: B
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A young graduate student is trying to identify new species of bacteria based on the criteria of Ernst Mayr
She is having a lot of trouble with this method, and then suddenly realizes that she can't use Mayr's definition of a species when it comes to bacteria. Why? (Select all correct choices.) A. DNA can be passed between bacteria of different species via horizontal gene transfer. B. DNA is never passed between bacteria of different species. C. Bacteria do not reproduce sexually and/or do not undergo meiosis. D. Bacteria form pili and, as a result, reproduce sexually.
DNA in prokaryotes is found in
a. the nucleoid. b. the nucleolus. c. plasmids. d. the nucleoid and plasmids. e. the nucleolus and plasmids.
Keratinase has the greatest effect on the ________.
A. genital system B. urinary system C. respiratory system D. skin E. gastrointestinal system
Identical twins occur when ________
A) two eggs are released and are fertilized by two different sperm B) one egg is released and is fertilized by one sperm, and the fetus later splits into two C) one egg is released and is fertilized by one sperm, and the pre-embryo later splits into two D) two eggs are released and are fertilized by the same sperm