During the contraction cycle, what is the result of ATP binding to myosin?
Ans: Myosin heads release from the binding site on actin
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The process whereby toxins are actively taken up by an organism is called:
a. additive affect. b. bioaccumulation. c. trophic dynamics. d. predator-prey relationships. e. adsorption onto seston.
On a biology field trip near campus you observe layers of volcanic rock, eroded mountain rocks, and even rocks apparently formed near an ocean coast. You notice that fossils found within the different rock layers have diverse body forms as a result of their environment. This set of observations tends to support
A. limits to the fossil organism populations, as proposed by Malthus. B. catastrophism, as proposed by Cuvier. C. uniformitarianism, as proposed by Hutton. D. uniformitarianism, as proposed by Lyell. E. microevolution of the organisms, as the environment changed.
The graph above shows the temperature profile for T. aquaticus polymerase, an enzyme used by a species of bacteria that
lives in hot springs. What does the boxed region indicate?
a. The enzyme activity increases as substrates increase their kinetic energy. b. The enzyme activity decreases as substrates increase their kinetic energy.
c. The enzyme activity increases as the enzyme denatures. d. The enzyme activity decreases as the enzyme denatures. e. The enzyme activity decreases as the enzyme refolds.
The microscopic space between nerve cells is called a:
A) Synapse B) Node C) Myelin sheath D) Cleft