Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds have the most visual sensitivity to the color red. Following their breeding season, these species of hummingbirds are
A. allopatric.
B. sympatric.
Answer: B
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Why is the absence of atmospheric oxygen (O2) so important to the Oparin-Haldane hypothesis?
a. Oxygen is corrosive and thus would have degraded many of the metallic compounds on Earth's surface, releasing toxic gasses into the new atmosphere. b. Oxygen is more reduced than hydrogen gas, methane, or ammonia. c. Oxygen would have supported microorganisms that promote chemical decay. d. Oxygen is able to reverse reactions by removing electrons and hydrogen from organic molecules, thus destroying the first organic compounds as quickly as they developed. e. Oxygen would have caused multiple explosions, converting chemical energy into heat energy and rendering that energy unavailable for driving the synthesis of organic molecules.
Which of the following organisms is a multicelled
producer?
a. an oak tree b. Candida, a pathogenic fungus c. E. coli, a common intestinal bacterium d. a Siberian tiger e. more than one of these
Strand slippage results in ________, which can cause a number of human diseases such as fragile X syndrome
A) tautomeric shift B) double-stranded DNA breaks C) pyrimidine dimer addition D) deletion of large sections of DNA E) the re-replication of highly repetitive DNA sequences
In combination with homologous recombination, the CRISPR/Cas system can be used to accomplish
A) gene fusions. B) gene deletion. C) point mutations. D) DNA cloning. E) gene fusions, gene deletions, or point mutations.