A(n) __________is an environmental agent that causes changes in DNA structure.
Fill in the blank(s) with the appropriate word(s).
mutagen
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The ____________________hormones are derived from tyrosine
Fill in the blank(s) with correct word
Some adults have the ability to digest lactose in milk. This is an example of
A. adaptation. B. feedforward regulation. C. positive feedback. D. negative feedback. E. None of the choices are correct.
Clot formation is a temporary measure to halt blood loss from an injured vessel until the more powerful platelet plug can be formed
Indicate whether the statement is true or false
In excitation-contraction coupling,
A. myosin heads bind to exposed active sites on actin. B. ATP binds to actin myofilaments. C. Ca2+ must bind with myosin to expose active sites on actin. D. movement of the troponin-tropomyosin complex causes actin myofilaments to slide. E. cross-bridges form between myosin heads and Ca2+.