Your classmate does not have much muscle strength. Her doctor says she has an autoimmune disease, but you didn't quite catch the name the physician gave for the illness. Based on what you have learned, what do you think the diagnosis is?
A) Alzheimer's disease
B) schizophrenia
C) senility
D) myasthenia gravis
D
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During the contraction of a vertebrate skeletal muscle fiber, calcium ions _____
A) break cross-bridges by acting as a cofactor in the hydrolysis of ATP B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed C) transmit action potentials from the motor neuron to the muscle fiber D) spread action potentials through the T tubules E) re-establish the polarization of the plasma membrane following an action potential
The solar system formed ____ billion years ago
a. 4 b. 5 c. 6 d. 7 e. 8
Refer to the accompanying figure. Which structure gives rise to the spinal cord?
a. 1 b. 2 c. 5 d. 8 e. 9
The population of American bison used to number in the millions of animals. Hunting and other problems greatly decreased the number of bison to about 1,000 animals. But today, the numbers are recovering to estimates of more than 200,000 animals. This crash in the population of bison and recent recovery is an example of ________.
A. the bottleneck effect B. gene flow C. genetic drift D. the founder effect