What are orthologs? Can orthologs also be considered homologs?
What will be an ideal response?
Orthologs are two genes in different species that possess a clear sequence and functional relationship to each other. They are also homologs because the homology relationship is based strictly on the sequence similarity.
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The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen. That group of bacteria was:
A. Cyanobacteria B. spirochaetes C. Proteobacteria D. Staphylococcus E. Actinobacteria
In a biology lab experiment, you and your classmates planted seeds from eudicot and monocot plants in soil that had been processed to remove nutrients. The seeds of each plant were still able to perform metabolism, enabling them to germinate and develop into seedlings. The nutrients were provided from the
A. spore coat. B. seed coat. C. endosperm. D. pollen grain. E. fruit.
In a comparison of birds and mammals, having four limbs is _____
A) a shared ancestral character B) a shared derived character C) a character useful for distinguishing birds from mammals D) an example of analogy rather than homology
One of the first naturalists to systematically study marine organisms was
a. Darwin b. Forbes c. Agassiz d. Aristotle e. Pliny