Myasthenia gravis is a disease caused by the immune system that attacks the acetylcholine receptors found on muscle cells. What effect would blocking these receptors have on muscle contraction?
What will be an ideal response?
Acetylcholine is needed to initiate an action potential on the surface of a muscle cell. Without it, the muscle will not contract. If a diseased state destroys or blocks the receptors that acetylcholine normally binds to, the signal will not be sent, and the muscle will not contract.
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Epizootic diseases often occur in wild animals on a periodic or cyclic basis
Indicate whether the statement is true or false.
A carefully formulated scientific explanation that is based on extensive observations and is in accord with scientific principles is called a
A) control. B) theory. C) fact. D) hypothesis. E) postulate.
Which of the following highlight the benefits of soil to plants?
A. soil supplies materials B. soil harbors nitrogen fixing bacteria C. soil has water holding capacity D. soil allows for air to be supplies to roots E. all are plant responses during heat and water stress
The relationship of free-energy change (?G) to the concentrations of reactants and products is important because it predicts the direction of spontaneous chemical reactions
In the hydrolysis of ATP to ADP and inorganic phosphate (Pi), the standard free-energy change (?G°) is –7.3 kcal/mole. The free-energy change depends on concentrations according to the following equation: ?G = ?G° + 1.42 log10 ([ADP] [Pi]/[ATP]) In a resting muscle, the concentrations of ATP, ADP, and Pi are approximately 0.005 M, 0.001 M, and 0.010 M, respectively. What is the ?G for ATP hydrolysis in resting muscle? (a) –11.1 kcal/mole (b) –8.72 kcal/mole (c) 6.01 kcal/mole (d) –5.88 kcal/mole