59. Saltatory Conduction a. occurs in unmyelinated nerve fiber b. is slower than
ID: 162528 • Letter: 5
Question
59. Saltatory Conduction
a. occurs in unmyelinated nerve fiber
b. is slower than conduction by local current flow because the myelin acts as an insulator to show the impulse down
c. involves the impulse jumping from one node of ranvier ro adjacent node
d. refers to the action potential spreading from one schwann cell to the adjacent schwann cell.
e. more than one of the above is correct
63. the universal energy currency in cells is
a. RNA b. ATP c. Glucose d. Glucogen e. DNA
66. which of the classes of hormones triggers the synthesis of new intracellular proteins within the target cell (via stimulation of DNA transcription and translation)?
a. peptides b. catecholamines c. steroids d. thyroid hormone e. both c and d are correct
68. hormones,
a. are all similar chemical composition
b. combine with specific receptors on the target cell's surface or inside the target cell
c. are secreted at a constatnt rate
d. all act by activating adenyl cyclase, which transforms ATP into cAMP
e. all of the above are correct
Explanation / Answer
59. The answer is ‘b’
Salutatory conduction is referred to as Schwann cell surrounding a myelinated nerve fiber serves an an insulator and prevent most ions from passing through.
63. The answer is ‘b’
Adenosine Triphosphate (ATP) is a nucleoside triphosphate, it is energy currency of the cell used in cellular functions like protein synthesis, cell movement, various solutes transport across the cell etc., where ATP breaks into ADP (adenosine diphosphate) and Pi (phosphate), this breakdown liberates energy that is used in reactions.
66. The answer is ‘e’
Hormones affect only the target cells, the target cells have only the particular hormone receptor, once the receptor binds with respective hormone, a chain of process is initiated that leads to the target cells response. Hormones play a vital role in metabolism, body tissues development, electrolyte balance etc.,
Steroids are the derivatives of lipids. Most of the steroid hormones are reproductive hormones both in male and female, they are testosterone and estrogen.
68. The answer is ‘b’
Hormones affect only the target cells, the target cells have only the particular hormone receptor, once the receptor binds with respective hormone, a chain of process is initiated that leads to the target cells response. Hormones play a vital role in metabolism, body tissues development, electrolyte balance etc.,
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