Dentosphere : World of Dentistry

# An acellular, condensed layer that forms a barrier between the epithelium and connective tissues is called: A. Basement membrane B. Gap junctions C. Desmosomes D. Luminal surface The correct answer is A. Basement membrane. An acellular, condensed layer that forms a barrier between the epithelium and connective tissues is called basement membrane (lamina). Luminal surface is the surface of the lumen and may contain specialized structures such as cilia, microvilli, or sterocilia. Desmosomes (macula densa) are small, circular patches deep in the zonula adherens. Gap junctions are small pores found between adjacent cells that allow the passage of small molecules.  CLICK HERE FOR MORE MCQs

 # Which of the following is not an important division of subclavian artery? A. Thyrocervical trunk B. Internal thoracic artery C. Carotid artery D. Vertebral artery The correct answer is C. Carotid artery. A. VERTEBRAL ARTERY: Supplies the brain. B. INTERNAL THORACIC ARTERY: Descends to supply the diaphragm and terminates as the superior epigastric artery, which helps to supply the abdominal wall. C. THYROCERVICAL OR CERVICOTHYROID TRUNK: Divides into three arteries- the transverse cervical artery, suprascapular artery and the inferior thyroid artery. D. COSTOCERVICAL TRUNK: divides into two branches- the superior intercostals and deep cervical arteries, which supply muscles of intercostal spaces. E. DORSAL SCAPULAR ARTERY: supplies the muscles of the scapular region.  Carotid artery is not a part of subclavian artery. CLICK HERE FOR MORE MCQs

 # The most abundant protein in humans is: A. Fatty acids B. Fiber C. Carbohydrates D. Collagen The correct answer is D. Collagen. Collagen is the most abundant protein in human body, characterized by its high rigidity and tensile strength. CLICK HERE FOR MORE MCQs

 # Which of the following collagen is found in cartilage? A. Type 1 B. Type 2 C. Type 3 D. Type 4 The correct answer is B. Type 2. Several types of Collagen are found in different body tissues. a. Type I - Skin, tendon, bone, dentin b. Type II - Cartilage c. Type III - Aorta, fetal skin d. Type IV - Basement membrane e. Type V - Placenta, Skin CLICK HERE FOR MORE MCQs

 # Approximately one third of collagen is glycine and about _______ is proline. A. 14 % B. 12 % C. 10 % D. 5 % The correct answer is C. 10 %. Approximately one third of collagen is glycine (every third position) and ten percent is proline. CLICK HERE FOR MORE MCQs

 # ________ is fibrous, insoluble protein derived from epidermis. A. Collagen B. Keratin C. Elastin D. Myofibril The correct answer is B. Keratin. Keratin is fibrous and insoluble protein derived from epidermnis. Elastin is rich in proline and other non polar side chains. Approximately one third of elastin is composed of amino acid glycine. CLICK HERE FOR MORE MCQs

 Name of Dental Clinic:Mithila Multispeciality Dental and Implant Centre Pvt. Ltd. Address (Full): Lahan-3;Hospital chowk Year of Establishment: 2079 Name of the chief Dental Surgeon: Dr.Pankaj Shah CONTACT NUMBER: 9803293946 CLICK HERE TO VIEW ALL DENTAL CLINICS OF PROVINCE NO 2