After exposure to Agrobacterium tumefaciens bacteria containing both a recombinant T-DNA vector and a helper plasmid, new plants can be grown from single cells in the presence of herbicide. Without the herbicide,
A) neither transformed nor nontransformed cells would survive.
B) only nontransformed plants would grow.
C) only cells with the helper plasmid would grow.
D) both transformed and nontransformed plants would grow.
D) both transformed and nontransformed plants would grow.
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The midrange of an array of phenotypes is favored in ____.
A. genetic drift B. disruptive selection C. gene flow D. stabilizing selection E. directional selection
The first part of the renal tubule is called the _____ and is specialized for _____
A. proximal convoluted tubule; reabsorption of electrolytes and other nutrients. B. loop of Henle; creation of a concentration gradient in the interstitial fluid C. distal convoluted tubule; secretion of additional wastes into the urine D. distal convoluted tubule; reabsorption of water E. collecting duct; reabsorption of water
What cellular structure assembles amino acids
into polypeptides?
a. Golgi bodies b. mitochondria c. ribosomes d. centrioles e. lysosomes
The Scaphopoda
a. Lack a shell b. Lack a mantle c. Live in fresh water d. Pursue prey in a manner similar to squid e. Lack gills