DNA possesses
A) only C and T bases.
B) only A and G bases.
C) A, U, G, and C bases.
D) C, T, A, and G bases.
E) only U and T bases.
D
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Which of the following is not true of the reaction catalyzed by RNA polymerases?
A. Template DNA is copied in the 3' to 5' direction. B. The 3'-hydroxyl group of the growing RNA strand is a nucleophile. C. The reaction is magnesium ion-dependent. D. U residues are incorporated into the RNA to pair with T residues of the template. E. The RNA molecule is synthesized in the 5' to 3' direction.
Virtually all enzymes are:
A) carbohydrates. B) nucleic acids. C) proteins. D) substrates.
If you were starting a company to produce cells, tissues, and extracellular matrix materials, what could your company produce from chondrocytes?
A. fibrin B. collagen C. elastin D. fibrin and collagen E. collagen and elastin
Which variable is not a density-dependent factor?
A. a red-tailed hawk preying upon a population of field mice B. competition between two male deer for territory C. an early cold spell that causes the plants in a given area to die off earlier than normal D. smallpox outbreaks during the 1800s