During muscle contraction, the heads of myosin filaments pull actin filaments toward the center of a ________ (the contractile unit of muscle)
Fill in the blank(s) with correct word
sarcomere
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What happens when a ligand binds to a ligand-gated sodium channel?
A. Sodium ions flow passively from high concentration to low concentration. B. Sodium ions are pumped from low concentration to high concentration. C. Sodium ions flow passively from low concentration to high concentration. D. There is no net flow of sodium ions.
In a contracted muscle, the Z lines of a sarcomere are ____
a. closer together but not overlapping b. further apart c. the same distance apart as when not contracting d. thicker e. overlapping
In the Lotka-Volterra model of predator-prey interactions, population growth is regulated through
A) reproduction for both predator and prey. B) reproduction for the predator and mortality for the prey. C) reproduction for the prey and mortality for the predator. D) mortality for both predator and prey.
Which of the following describes the Lac operon in E. coli when lactose, but not glucose, is present in the culture medium?
A. CAP and the Lac repressor are both bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. B. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed. C. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. D. CAP, but not the Lac repressor, is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed. E. The Lac repressor, but not CAP, is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed.