Somatic hypermutation occurs only in the ________ regions of rearranged heavy and light chains
A) D
B) HV
C) J
D) V
Answer: D
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Evidence for the extinction of the dinosaurs approximately 65 million years ago comes from meteorites containing:
A. iridium. B. palladium. C. carbon. D. silicon. E. plutonium.
The types of living organisms on Earth have changed over time-new species have originated and existing species have disappeared. This is an example of
A. speciation. B. extinction. C. macroevolution. D. alternation of generations. E. hybridization.
Membrane-bound organelles have been an important component in the evolution of complex, multicellular organisms. Which of the following best summarizes an advantage of eukaryotic cells having internal membranes?
(A) Eukaryotic cells are able to reproduce faster because of the presence of organelles. (B) Some organelles, such as mitochondria and chloroplasts, are similar to prokaryotic cells in structure. (C) Organelles isolate specific reactions, increasing metabolic efficiency. (D) Compartmentalization leads to a higher mutation rate in DNA, which leads to more new species.
Energy is taken in energy carriers from glycolysis and the Kreb's cycle to the electron transport chain by which molecule?
A.) H2O B.) NADH and FADH2 C.) ATP D.) NADH