ch18 - Exam Name MULTIPLE CHOICE Choose the one alternative...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) All of the following are true of the nervous system except that it does not 1) A) function independently of the endocrine system. B) respond rapidly to stimuli. C) respond with motor output. D) communicate by the release of neurotransmitters. E) respond specifically to stimuli. 2) Endocrine cells 2) A) release their secretions directly into body fluids such as blood. B) are modified connective - tissue cells. C) release their secretions onto an epithelial surface. D) contain few vesicles. E) are a type of nerve cell. 3) ________ are chemical messengers that are released by cells and transported in the bloodstream to alter the activities of specific cells in other tissues. 3) 4) A hormone might 4) 5) Hormones known as "catecholamines" are 5) 6) Peptide hormones are 6) A) derived from the amino acid tyrosine. B) composed of amino acids. C) produced by the suprarenal glands. D) chemically related to cholesterol. E) lipids. 1
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7) A kinase is an enzyme that performs 7) A) active transport. B) phosphorylation. C) protein synthesis. D) as a membrane channel. E) as an antibody. 8) An activated G protein can trigger 8) 9) Calcium ions serve as messengers, often in combination with the intracellular protein 9) 10) Hormones can operate on the ________ level of organization. 10) 11) Why is it that steroid hormones use receptors inside of target cells, whereas protein, peptide, and amino acid hormones do not? 11) A) The target cells affected by steroid hormones have all of their receptors in the cell cytoplasm. B) Amino acids and peptide hormones do not have a 3 dimensional structure that can bind to internal receptors. C) Cells are full of steroid molecules so it is easy for steroid molecules to enter. D) Steroids can cross the cell membrane because they are lipids and the membrane is lipid. E) All of the answers are correct.
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