Vitamins-EC

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Which one of the following statements concerning vitamin D is correct?
A. Vitamin D deficiency is a cause of scurvy.
B. Vitamin D acts as a hormone in calcium regulation.
C. Vitamin D functions in part to aid in optic nerve transmission.
D. One form of vitamin D is referred to as pyridoxal phosphate.
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Terms in this set (22)
Which one of the following statements concerning vitamin D is correct?
A. Vitamin D deficiency is a cause of scurvy.
B. Vitamin D acts as a hormone in calcium regulation.
C. Vitamin D functions in part to aid in optic nerve transmission.
D. One form of vitamin D is referred to as pyridoxal phosphate.
B
Deficiency of which of the following vitamins will result in decreased heme synthesis?
A.
Niacin
B.
Thiamine
C.
Pyridoxal phosphate (PLP)
D.
Riboflavin
C
Which one of the following vitamins will reduce iron and aid in its absorption by the intestine?
A. Vitamin C
B. Vitamin B12
C. Vitamin A
D. Vitamin D
A
Absorption of vitamin B12 requires the presence of
A.
intrinsic factor.
B.
vitamin C.
C.
insulin.
D.
folic acid.
A
Which vitamin is given to a newborn within minutes of birth?
A.
Vitamin D
B.
Vitamin B12
C.
Vitamin A
D.
Vitamin K
D
Thiamin
A. is considered a fat soluble vitamin.
B. deficiency is referred to as pellagra.
C. functions in oxidative decarboxylation reactions.
D. All of the above are correct.
C
Vitamin B1—also known as thiamine—forms the coenzyme thiamine pyrophosphate (TPP). It is required for the essential decarboxylation reactions catalyzed by the pyruvate and 2-oxoglutarate complexes.
Scurvy is associated with deficiency of which of the following vitamins?
A.
Vitamin A
B.
Vitamin C
C.
Vitamin B12
D.
Vitamin D
B
Which is the functional relationship between vitamin A and -carotene?
A.
Vitamin A is catabolized to -carotene for excretion.
B.
-carotene is the principal precursor of vitamin A.
C.
-carotene aids in the absorption of vitamin across the intestinal wall.
D.
Vitamin A is bound to -carotene as it circulates.
B
Which one of the following vitamins would be least affected by long periods of fat malabsorption?
A.
Vitamin A
B.
Vitamin E
C.
Vitamin D
D.
Vitamin C
D
Which vitamin contains a porphyrin-like structure with a cobalt nucleus?
A.
Thiamin
B.
Niacin
C.
Folic acid
D.
Vitamin B12
D
Selenium A. is a constituent of glutathione peroxidase and is associated with vitamin E. B. excess will induce copper deficiency by blocking copper absorption. C. toxicity results in neurological symptoms resembling Parkinson disease. D. stabilizes the regenerating tooth surface by binding the tooth enamel.ANS: A Selenium (Se) is an essential element for humans, being a constituent of the enzyme glutathione peroxidase and believed to be closely associated with vitamin E in its functions.Which one of the following trace elements which, when combined with an enzyme, is essential for stabilization of extracellular matrixes, such as collagen and elastin? A. Cobalt B. Chromium C. Copper D. ZincCThe most commonly used method of analysis for assessing vitamins A, E, riboflavin, and vitamin B6 is A. spectrophotometry. B. high performance liquid chromatography (HPLC). C. immunoassay. D. competitive protein binding.BA 14-year-old girl comes to her pediatrician with immature secondary sex characteristics and small stature. Her mother complains that the adolescent also exhibits very slow healing of cuts and scrapes, and some hair loss. Your laboratory has ruled out any inborn error of metabolism and possible cancer. Deficiency of what trace element might be responsible for the stated symptoms? A. Copper B. Chromium C. Selenium D. ZincANS: D In children, reduced growth and other developmental abnormalities can develop with zinc deficiency. Other problems include (1) diarrhea, (2) mental depression, (3) dermatitis, (4) delayed wound healing, and (5) alopecia.What is the most widely used specimen for detection of the trace element deficiency of zinc? A. Whole blood B. Plasma C. Serum D. UrineBWhat specific specimen collection procedures should be observed when assessing zinc deficiency? A. Samples should be collected in plastic lithium-heparin blood-collection tubes. B. Steel collection needles and EDTA-containing blood-collection tubes should be used. C. A 24-hour urine collection with no preservative added should be used for analysis. D. Plastic cannulae and special collection tubes should be used for collection of this element.AActivity of which one of the following enzymes might be greatly affected by a deficiency of zinc? A. Creatinine kinase B. Cholinesterase C. Alkaline phosphatase D. Gamma glutamyl-transferaseCWhich one of the following trace elements would be most affected when a hemolyzed sample is used for analysis? A. Copper B. Chromium C. Manganese D. CobaltANS: C For manganese, hemolysis should be prevented during sample separation. Whole blood has about 10 times as much manganese as plasma or serum and if serum or plasma is used for testing, hemolysis will produce a falsely increased result.Fat soluble vitamins include A. B and C vitamins only. B. Vitamin B12 and folic acid. C. Vitamins D and E only. D. Vitamins A, D, E, and K.DMatch the correct vitamin in column with the correct disorder a deficiency of the vitamin would cause. Answers are used only once. A. Impaired blood coagulation B. Megaloblastic anemia C. Night blindness D. Beriberi 1. Thiamine 2. Retinol 3. Quinone 4. Cobalamin1. D 2. C 3. A 4. BMatch the trace or ultratrace elements with the clinical disorders associated with either deficiency or toxicity. Answers are used only once. A. Menke's disease B. Lung cancer C. Loss of immunocompetence D. Parkinson disease-like symptoms 1. Chromium 2. Manganese 3.. Copper 4. Selenium1. B 2. D 3. A 4.CMatch the trace element with its correct function. Answers may be used once, more than once, or not at all. A. Role in glucose tolerance B. Structural component of vitamin B12 C. Cofactor in electron transfer reactions D. Normal growth and development 1. Molybdenum 2. Cobalt 3. Zinc 4. Chromium 5. Manganese1- C 2-B 3. D 4. A 5 D