T, or transverse, tubes in skeletal muscle function to
A) transport calcium ions throughout muscle cells.
B) allow actin and myosin filaments to slide over each other.
C) promote the rapid penetration of the electrical impulse deep into the cell.
D) help decrease the amount of ATP produced.
E) convert glucose to lactic acid, which helps muscles relax.
C
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The atomic number of an element is equal to the number of:
A. protons plus neutrons. B. neutrons plus electrons. C. neutrons only. D. protons only. E. protons plus electrons.
Which of the following excretory tubule segments in mammals allows water to exit but does not allow
ions or urea to exit?
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
DNA gyrase
A. closes gaps between DNA bases. B. removes supercoiling ahead of origin. C. synthesizes RNA primers. D. copies DNA bases.
Tendons connect
a. bones to bones. b. bones to ligaments. c. muscles to bones. d. bones to cartilage. e. muscles to ligaments.