Explain how a complex trait, such as eyes or the ability to fly, can evolve by incremental modifications over time
What will be an ideal response?
A trait that makes an organism successful in one situation may have other benefits in other situations. For example, feathers are modified scales that may have evolved from a mutation that made the scales softer or lighter. This change may have improved heat regulation or may have been effective in scaring off predators. Consequently, larger feathers then would have been selected for, and those feathers may have allowed the organism to attract a mate or hop further. Eventually hopping gets selected for, and, step by step, wings and flight evolve, but a flying feathered creature didn't just appear one day from nowhere.
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Are superantigen reactions beneficial or harmful to the host? What is different about a superantigen reaction compared to normal antigen-host cell interactions?
What will be an ideal response?
Blood is routed through the capillary beds through the action of ____ at the metarterioles
a. epithelium b. precapillary sphincters c. cartilage d. fibrous connective tissue e. skeletal muscle
Degradation of cytoplasmic organelles occurs by fusion of lysosomes with structures called
a. primary lysosomes. b. phagolysosomes. c. autophagosomes. d. mitochondria.
Babies exposed to an intracellular parasite normally transmitted by sexual contact are at risk for (conjunctivitis/trachoma/warts)
What will be an ideal response?