____________ are composed of the myosin and actin filaments—the contractile portion of the muscle.
Fill in the blank(s) with the appropriate word(s).
Ans: Myofibrils
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Nuclear Binding Energy: Bismuth 
Bi is known to be radioactive. The stability of 
Bi with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
A. subject to alpha decay only. B. subject to beta-plus decay only. C. subject to beta-minus decay only. D. subject to alpha or beta-plus decay, but not beta-minus decay. E. subject to alpha or beta-minus decay, but not beta-plus decay.
Voids are
A. spaces between stars. B. regions in the centers of galaxies containing many black holes. C. spaces between galaxies within a cluster. D. huge regions of space with few or no galaxies.
This figure depicts pollen grains suspended in a liquid exhibiting a continual, erratic motion known as Brownian motion. Albert Einstein inferred that atoms exist based on his calculations that described this type of motion. What was the basis for his conclusion?
a. The erratic motions of the pollen grains were explained by Einstein to result from random collisions with water molecules. b. The tiny grains could be shown to be atoms. c. The existence of atoms was an inescapable conclusion of his theory of relativity. d. The existence of atoms was an inescapable conclusion of his theory of the photoelectric effect. e. The existence of atoms was an inescapable conclusion of his theory of heat capacities of solids.
If a force on an object is aimed opposite the direction of the object's velocity, the force does
a. no work c. negative work b. positive work d. any of the above