Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm
A. from the Z line.
B. from the actin and myosin subunits.
C. from the troponin.
D. from the sarcoplasmic reticulum.
E. from the extracellular fluid in the neuromuscular junction.
D. from the sarcoplasmic reticulum.
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The "stress hormone" involved in stomatal closure during water stress is:
a. abscisic acid. b. auxin. c. cytokinin. d. ethylene. e. gibberellin.
The results of Miller's experiments best support which of the following hypotheses?
(A) The molecules essential to life today did not exist at the time Earth was first formed. (B) The molecules essential to life today could not have been carried to the primordial Earth by a comet or meteorite. (C) The molecules essential to life today could have formed under early Earth conditions. (D) The molecules essential to life today were initially self- replicating proteins that were synthesized approximately four billion years ago.
How does the ability of bacteria to acquire new genes affect antibiotic resistance?
What will be an ideal response?
Canines (cuspids) are used to
a. grind food. b. bite off chunks of food. c. tear food. d. mince food. e. pulverize food.