Which of the following is an interaction that stabilizes the three-dimensional structure of DNA?
A. planar nature of bases due to resonance
B. tautomerism of the bases
C. absorbance of UV light
D. hydrophobic stacking
E. repulsion between the negatively charged phosphate groups of the DNA backbone
D
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In mammals, X chromosome inactivation results in _____
a. a total inactivation of both female X chromosomes b. only the inactivation of the paternal X chromosome in females c. only the inactivation of the maternal X chromosome in females d. the random inactivation of either the paternal or the maternal X in females e. the inactivation of the maternal X chromosome in males
The most important evidence that Darwin used to
develop his theory of natural selection came from a. the Argentine pampas. b. his boyhood neighborhood in England. c. the Galápagos Islands. d. Australia and New Zealand. e. South America.
The carbon found in carnivores would follow which of the following paths?
A. plant ® air ® carnivore B. herbivore ® plant ® air ® carnivore C. air ® bacteria ® plant ® herbivore ® carnivore D. air ® plant ® herbivore ® carnivore
Ionizing radiation can also cause damage to the nitrogenous bases of DNA. Repair of the damaged bases takes several steps. Which of the following repair mechanisms can be used to repair the nitrogenous bases of DNA damaged by ionizing radiation?
A. mismatch repair B. nonhomologous end joining C. excision repair D. direct repair