522. For a normal healthy person, the daily requirement of vitamin C is:

A.   10 to 50 mg                              B. 50 to 100 mg

C.   100 to 200 mg                          D. 200 to 300 mg

Which of the following are risk factors for deep venous thrombosis? 1. Duration of surgery more than 30 minutes 2. Prior history of venous thrombosis 3. Age less than forty years 4. Obesity Select the correct answer using the codes given below: Codes:

A.   1, 2 and 3  B. 1, 2 and 4  C. 2, 3 and 4  D. 1, 3 and 4

520. The lamina propria is:

 A.  epithelial tissue 
 B.  connective tissue 
 C.  adipose tissue 
 D.  muscle tissue 

519. A 5-year-old child develops a febrile disease with cough, a blotchy rash, and cervical and axillary lymphadenopathy. Also noted is an erythematous, maculopapular rash behind the ears and along the hairline, involving the neck and, to a lesser extent, the trunk. Examination of this patient's oropharynx would likely reveal which of the following lesions?

 A.  Adherent thin, whitish patch on gingiva 
 B.  Cold sores on the lips 
 C.  Curdy white material overlying an erythematous base on the oral mucosa 
 D.  Large shallow ulcers on the oral mucosa 
 E.  Multiple small white spots on the buccal mucosa 

519. Delta waves of electroencephalogram have frequency of:

1. More than 14 cycles per second. 
2. Between 8 and 13 cycles per second. 
3. Less than 3.5 cycles per second. 
4. Between 4 and 7 cycles per second.

518. Which of the following cell types show abnormal function when there is a history in a young adult of multiple arm and leg fractures following minor falls, with a slight weakness of facial muscles on the left, mild anemia, and with generalized bony widening with partial obliteration of marrow spaces?

 A.  Granulocytic stem cells 
 B.  Megakaryocytes 
 C.  Plasma cells 
 D.  Osteoblasts 
 E.  Osteoclasts

517. A 5-year-old child has blue-tinged sclera, hearing loss, and small, slightly blue, misshapen teeth. Radiologic studies confirm the presence of numerous fractures of various ages. No significant degree of bruising is seen over sites of recent fracture. The disease this child most likely has is related to abnormal metabolism involving which of the following substances?

 A.  Collagen 
 B.  Glycogen 
 C.  Mucopolysaccharides 
 D. Purines 
 E.  Tyrosine 

516. An animal is made diabetic by injection of a drug that destroys pancreatic ß cells. Removal of which of the following organs would most likely produce a decrease in blood glucose concentration in this animal?

A.  Anterior pituitary   
B.  Colon   
C.  Gonads   
D.  Kidney   
E.  Pancreas

515. An abrasion results in the total loss of epidermis over a large area of an arm, but one month later, the abrasion has healed, with regrowth of the epidermis. Which of the following mechanisms accounts for the restoration of the epidermis over the abraded area?

 A.  Growth of epidermis from hair follicles and sweat glands in the dermis
 B.  Migration of endothelial cells from newly grown capillaries
 C.  Transformation of dermal fibroblasts into epidermal cells
 D.  Transformation of macrophages into epidermal cells
 E.  Transformation of melanocytes into epidermal cells