The development of wings on a fly, a moth, and a bird are ____ because they developed independently as adaptations to perform the common function of flying
A. homologous
B. related
C. analogous
D. identical
C
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They serve as the working parts of cilia and flagella
A) Cristae B) Electron transport chain C) Microtubules D) Glycolysis E) Flagella F) Plasma membrane G) Citric acid cycle H) ATP
Three critical amino acids in the active site of an enzyme are leucine, tryptophan, and alanine. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
About 12,000 years ago, a mass extinction event occurred and 75% of the world's large mammal species were eliminated. While a small number of cheetahs managed to survive and restore the world's population of cheetahs, this event caused an extreme reduction of the cheetah's genetic diversity. Based on the principles of natural selection, which of the following is a consequence of their reduced genetic diversity?
A. Cheetahs within the same population do not vary in their reproductive success. B. Cheetahs have never fully adapted to the current environment. C. Cheetahs are unable to effectively compete with each other for resources. D. Cheetahs have very little heritable variation, which will make it difficult for them to adapt as the environment changes.
Which of these is the smallest unit that natural selection can change?
A) a species? gene frequency B) a population?s gene frequency C) an individual?s genome D) an individual?s genotype E) an individual?s phenotype