The following events occur during the initiation of a skeletal muscle contraction. Put the following events in order of occurrence starting with the first event
a. signal travels along motor neuron
b. calcium is released
c. action potential moves down T tubules
d. action potential arrives at neuromuscular junction
e. action potential travels along muscle fiber membrane
f. acetylcholine is released
g. myosin binds actin
h. binding of acetylcholine triggers an action potential in a muscle fiber
i. action potential arrives at sarcoplasmic reticulum
a, d, f, h, e, c, i, b, g
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Answer the following statements true (T) or false (F)
1. Influenza is an example of a contagious disease. 2. Zoonotic diseases are diseases that humans acquire from zoo animals. 3. The largest waterborne outbreak ever to occur in the United States was caused by Giardia lamblia. 4. Water containing 1 coliform per 100 mL would be considered potable. 5. The most common zoonotic infection in the United States is Rocky Mountain spotted fever.
Which of the following is a reasonable explanation for why unsaturated fatty acids help keep a
membrane more fluid at lower temperatures?
a. The double bonds form a kink in the fatty acid tail, forcing adjacent phospholipids to be spaced further apart. b. Unsaturated fatty acids have a higher cholesterol content. c. Unsaturated fatty acids permit more water in the interior of the membrane. d. The double bonds block interaction among the hydrophilic head groups of the lipids. e. The double bonds result in a shorter fatty acid tail.
Which of the following result from sperm penetration? (Check all that apply.)
_____ eggs complete meiosis _____ haploid nucleus of egg undergoes final mitotic division _____ movement of egg cytoplasm _____ outer pigmented cap of egg cytoplasm rotates toward point of entry _____ sharp increase in protein synthesis
If the NaCl concentration drops below 1.5 M the cell walls of Halobacterium become more rigid.
Answer the following statement true (T) or false (F)