Dentosphere : World of Dentistry

 # Vitamin related to coenzyme A: A. Thiamine B. Riboflavin C. Cobalamine D. Pantothenic acid The correct answer is D. Pantothenic acid. • Co-enzyme A is an important component of fatty acid synthase complex. The Co-enzyme A is a complex molecule containing B complex vitamin pantothenic acid and a molecule of beta mercaptoethanol amine.  • The ACP (acyl carrier protein) also contains pantothenic acid.  • The important CoA derivatives are: - Acetyl CoA - Succinyl CoA - HMG CoA - Acyl CoA.  • The functions of Pantothenic acid are exerted through CoA (A for acetylation). It is a component of Pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase and Thiokinase. Besides the various functions through coenzyme A, pantothenic acid itself is a component of fatty acid synthase complex and is involved in the formation of fatty acids.  CLICK HERE FOR MORE MCQs

 # Angular cheilosis is frequently associated with the deficiency of: A. Thiamine B. Riboflavin C. Niacin D. Folic acid The correct answer is B. Riboflavin. Magenta tongue (glossitis), fissures at corners of mouth (cheilosis), are common manifestations of  vitamin B2 deficiency.  CLICK HERE FOR MORE MCQs

 # Lazarine leprosy is a variant of: A. Lepromatous leprosy B. Tuberculoid leprosy C. Intermediate leprosy D. Dimorphic leprosy The correct answer is A. Lepromatous leprosy. Lazarine leprosy: This an unusual type of the disease characterized by ulceration and gangrene. The early lesions are bullae, which soon rupture and become gangrenous. It includes achromic and hypochromic spots of the lepra called lazarine (systematized nervous lepra with leprous erythema, pemphigoid and escharotic), and finally of mixed lepra.  CLICK HERE FOR MORE MCQs

 # Opsonins are: A. C3a B. IgM C. Carbohydrate binding proteins D. Selectins The correct answer is C. Carbohydrate binding proteins. Opsonins  • Chemicals causing opsonisation  • They are specific carbohydrate binding proteins  Examples of opsonins  • C3b  • Fc fragment of antibody or IgG  • Some serum proteins (like fibrinogen, mannose binding lectin and C reactive protein)  CLICK HERE FOR MORE MCQs

 # Origin and insertion of which of the following muscles can be seen clearly from outside? A. Masseter B. Platysma C. Sternocleidomastoid D. All of the above The correct answer is C. Sternocleidomastoid. Sternocleidomastoid forms the most important landmark on the side of the neck. It becomes prominent when the face is turned to the opposite side and is seen as a raised ridge extending obliquely from the sternum to the mastoid process. It is the key muscle of the neck which extends obliquely across the side of the neck, dividing it into posterior and anterior triangles. CLICK HERE FOR MORE MCQs

 # Chronological hypoplasia is: A. Hypoplasia of local origin B. Hypoplasia of systemic origin C. Hypoplasia of hereditary origin D. None of the above The correct answer is B. Hypoplasia of systemic origin. Hypoplasia and hypocalcification may be caused by systemic, local or hereditary factors. Hypoplasia of systemic origin is termed as chronologic hypoplasia, because the lesion is found in the areas of those teeth where the enamel was formed during the systemic disturbance.  CLICK HERE FOR MORE MCQs

 # Which of the following is most frequently noted in patient populations suffering from chronic temporomandibular joint disorder? A. Passive aggressive disorder B. Borderline personality disorder C. Sociopathy D. Schizotypical behavior E. Depression psychosis The correct answer is E. Depression psychosis. Depression psychosis is a condition which may worsen with the presence of TMJ dysfunction. Several studies suggest that the presence of depression is a common condition among people experiencing chronic pain, especially TMD. People most prone to TMJ possess a malocclusion. Other factors that cause TMJ disease include grinding teeth during sleep (bruxism), having an overbite, and rheumatoid arthritis. CLICK HERE FOR MORE MCQs