Which of the following is a primary chemical characteristic distinguishing steroid hormones from non-steroid hormones?
Non-steroid hormones include lipid-based molecules.
Non-steroid hormones contain fatty acids.
Steroid hormones are derived from cholesterol.
Steroid hormones are composed of amino acids.
The Correct Answer is C
A. Non-steroid hormones include lipid-based molecules.: Many non-steroid hormones are peptide- or amino-acid–derived and are water-soluble rather than lipid-based, although some non-steroid hormones (like thyroid hormones) are lipid-soluble exceptions.
B. Non-steroid hormones contain fatty acids.: Non-steroid hormones are typically peptides or amino-acid derivatives and do not characteristically contain fatty-acid structures.
C. Steroid hormones are derived from cholesterol.: Steroid hormones are synthesized from cholesterol, giving them a four-ring lipid structure that makes them lipid-soluble and able to cross cell membranes.
D. Steroid hormones are composed of amino acids.: Steroid hormones are not composed of amino acids; amino-acid composition is a feature of peptide hormones and some amine hormones.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Filtering lymph and housing lymphocytes:Lymph nodes filter lymph fluid to remove pathogens and debris and contain lymphocytes (B and T cells) and antigen-presenting cells that participate in immune responses.
B. Producing red blood cells:Red blood cell production occurs primarily in the bone marrow, not in lymph nodes.
C. Facilitating nutrient absorption:Nutrient absorption (notably fat absorption) occurs in the small intestine, particularly the villi and lacteals, rather than in lymph nodes.
D. Transporting oxygen:Oxygen transport is performed by red blood cells in the bloodstream, not by lymph nodes.
Correct Answer is C
Explanation
A. Plasma proteins:Plasma contains clotting (coagulation) proteins such as fibrinogen and other clotting factors that are essential to the coagulation cascade, but they require cellular elements to form a stable clot.
B. Red blood cells:Red blood cells are not responsible for initiating clot formation; they become trapped in the fibrin mesh of a clot but do not drive clotting.
C. Platelets:Platelets (thrombocytes) adhere to damaged endothelium, aggregate, and provide a phospholipid surface for coagulation enzyme complexes, playing a primary role in clot formation.
D. White blood cells:White blood cells participate in immune responses and inflammation but are not the primary cellular drivers of clot formation.
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