471.Denaturation of double stranded DNA results in

a.It gets broken down to nucleotides.
b.It becomes single stranded reversibly.
c.Becomes single stranded iireversibly.
d.Becomes double stranded permanently.

Ans-b.It becomes single stranded reversibly.

470.All potentiate digoxin toxicity except

a.Hyperkalemia
b.Hypomagnesia
c.Hypercalcemia
d.Renal failure

Ans-a.Hyperkalemia
 Ref-Katzung pg 54-55   10th ed
Hyperkalemia is a protective factor as in the presence of hyperkalemia,the binding of digoxin becomes less

469.Substance P is released in response to pain in periphery

a.Nerve terminalis
b.Mast cells
c.Endothelium
d.Plasma

Ans-a.Nerve terminalis

Ref -Ganong's review of medical physiology 23 rd ed pg 112

468.The sulcular epethilium acts as a semipermeable membrane through which

a.Bacterial products pass into the gingiva.
b.Fluids from the gingiva seep into the sulcus.
c.Both of the above.
d.None of the above.


Ans-c. Both of the above
Ref-Caranza 9 th ed pg 23

467.Etiology of multiple neurofibromatosis is

a.Genetic
b.Viral
c.Injury
d.Endocrine


Ans-a.Genetic

Reference-Shafer's 5th ed pg 280

466.Keratocanthoma most commonly occurs on

a.Lips
b.Buccal mocosa
c.Gingiva
d.Palate

Ans-a.Lips

465.Sarcoma of the soft tissues spread by

1.Blood vessels
2.Lymphatics
3.Direct invasion
4.Local infiltration

Ans-1.Blood vessels
 Ref -Shafer 4th ed pg 169 /5th ed pg 220