Official NBDE Part 1 Study Q & A Thread

Started by tinman831
This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.
Get help with your application

Use all the free resources available to you from SDN: articles, guides, expert advising, forums discussions, and school research.

Browse articles Compare schools My application plan Read Interview Feedback
Practice for interviews Ask an Advisor
tinman831

tinman831

¯\_(ツ)_/¯
Staff member
Administrator
Volunteer Staff
Lifetime Donor
Verified Member
Dentist
Verified Expert
20+ Year Member
Gold Donor
Advertisement - Members don't see this ad
Please post all study questions/answers for the NBDE Part 1 in this thread. Good luck!

As a side note, this is not the place for sales ads. Discussion of remembered questions appearing on the exam is also not permitted.
 
Last edited:
Sort by date Sort by votes
how hypothyroidism causes +ve nitrogen balance ....if there s hypo thn there will be decrease cellular metabolism and growth so -ve N2 balance right?
plz clarify this for me...thank u
 
Upvote 0 Downvote
Holly J said:
Is the question complete?
Either its 1 and 2 or just 3! If the collaterals are present then there wouldnt be infarction/fibrosis of myocardium(1 &2).
What was the answer Pookan?
Hatico....mind explaining your answer?
Click to expand...
all 3 of them are right..this s the whole question:-
thrombotic occlusion of coronary artery may result in
a)infraction of myocardium
b)proliferation of myocardial fibers
c)fibrosis
d)stenosis of mitral valve
e)no changes in myocardium
1)a,b, or c
2)a,c, or d
3)a,c or e (ans)
4) b,d or e
5)any of the above
 
Upvote 0 Downvote
PooKan said:
all 3 of them are right..this s the whole question:-
thrombotic occlusion of coronary artery may result in
a)infraction of myocardium
b)proliferation of myocardial fibers
c)fibrosis
d)stenosis of mitral valve
e)no changes in myocardium
1)a,b, or c
2)a,c, or d
3)a,c or e (ans)
4) b,d or e
5)any of the above
Click to expand...

That cant be!! can you tell me in which year's paper is this question? Let me check.
 
Upvote 0 Downvote
Advertisement - Members don't see this ad
Holly J said:
Hatico....mind explaining your answer?
Click to expand...

Healthy heart almost has not collaterales between main vessels, but has reach small vessels collateral net. That is why total coronar artery occusion often does not lead to infarction. Few day after total occusion the blood circulit in the cardiac muscle is 50% of normal. In 25-30days - 100%.
Development of collaterales - main point in patients recovery after infarction ( if area of infarction is not too big).

There is cannot be proliferation also. Demaged muscle fibers are replaced by fibrous tissue.
 
Upvote 0 Downvote
the term 'nephrosis' implies renal disease which primarily involves
-tubules( ans)
-glomeruli
-renal papillae
-renal artery
-interstitial CT
y cant it be glomerli...
 
Upvote 0 Downvote
Advertisement - Members don't see this ad
The largest incisal/occlusal embrasure is located between which of the following teeth?

  1. Maxillary lateral incisor and canine
  2. Maxillary canine and first premolar
 
Upvote 0 Downvote
In an acquired Class III crossbite relationship, as the mandible retrudes, the maxillary lateral incisor contacts which of the following teeth?

  1. Central incisor
  2. Lateral incisor
  3. Central and lateral incisors
  4. Canine and lateral incisors
Mandible is protuded in ClassIII occlusion, correct?
 
Upvote 0 Downvote
Hatico said:
In an acquired Class III crossbite relationship, as the mandible retrudes, the maxillary lateral incisor contacts which of the following teeth?

  1. Central incisor
  2. Lateral incisor
  3. Central and lateral incisors
  4. Canine and lateral incisors
Mandible is protuded in ClassIII occlusion, correct?
Click to expand...
yes..mandible is protruded in Class III ....so when u retrude it as asked in question it will come to normal class I occlusion..so the ans will be mand canine and lateral incisor....
 
Upvote 0 Downvote
an oral lesion tht may appear as an ulcer, a nodule or vegetative process and is often mistaken for squamous cell carcinoma is manifestation of
-candidiasis
-trichinosis
-sporotrichinosis
-histoplasmosis(ans)
i searched in wiki it have given no relevance to squamous cell carcinoma..i thought it resembles TB...is this option right?
 
Upvote 0 Downvote
PooKan said:
an oral lesion tht may appear as an ulcer, a nodule or vegetative process and is often mistaken for squamous cell carcinoma is manifestation of
-candidiasis
-trichinosis
-sporotrichinosis
-histoplasmosis(ans)
i searched in wiki it have given no relevance to squamous cell carcinoma..i thought it resembles TB...is this option right?
Click to expand...

In simple terms the question is where do u see "ulcers/nodules"?
Its not seen in candida,trich,sporo....etc
O/M of Histoplasmosis:The lesions generally appear in the form of nodule. These nodules may be ulcerative or vegetative lesions. The common sites for oral histoplamic lesions are the buccal mucosa, gingiva, tongue, palate and lips. 👍
 
Upvote 0 Downvote
PooKan said:
the term 'nephrosis' implies renal disease which primarily involves
-tubules( ans)
-glomeruli
-renal papillae
-renal artery
-interstitial CT
y cant it be glomerli...
Click to expand...

Nephrosis affects only the epithelium of the tubules...glomeruli is not effected...and there is no inflamation related.
 
Upvote 0 Downvote
the most immediate source of oxaloacetic acid during metabolism is
- aspartic acid
but oxaloacetic acid forms aspartic acid right? and then its dumped into urea cycle!! plz correct me if iam wrong...😕
 
Upvote 0 Downvote
System32 said:
Thanks thats what i thought. They gave it as C. Anyways can you tell me difference b/w Idiotype, Isotype and Allotype in simple terms?
Click to expand...

Idiotype - A set of one or more antigenic determinants specific to the variable region of an immunoglobulin molecule

Isotype - (1)A biological specimen that is a duplicate of a holotype (2) Any of the subclasses of immunoglobulins defined by the chemical and antigenic characteristics of their constant regions

Allotype - The protein product (or the result of its activity) of an allele which may be detected as an antigen in another member of the same species.(eg histocompatibility antigens, immunoglobulins), obeying the rules of simple Mendelian inheritance.

For a better picture of the three you can read this publication from this web addy - http://jeeves.mmg.uci.edu/Immunology/CoreNotes/Chap06.pdf
 
Upvote 0 Downvote
PooKan said:
what s diff btw resting lines and reversal lines?
Click to expand...

Resting lines - as seen in a histologic section of cortical bone of the mandible, are a result of growth of the mandible by appositional growth (2) Lines created by alternating periods of bone formation and rest, giving a tierlike appearance to lamellar bone

Reversal lines - Irregular lines containing concavities directed away from the bundle bone and serving as histologic indications that resorption has taken place up to that line from the marrow sidebone
 
Upvote 0 Downvote
Advertisement - Members don't see this ad
ionomer said:
Resting lines - as seen in a histologic section of cortical bone of the mandible, are a result of growth of the mandible by appositional growth (2) Lines created by alternating periods of bone formation and rest, giving a tierlike appearance to lamellar bone

Reversal lines - Irregular lines containing concavities directed away from the bundle bone and serving as histologic indications that resorption has taken place up to that line from the marrow sidebone
Click to expand...
👍
 
Upvote 0 Downvote
impulse conducting mechanism in heart is composed of
-autonomic nerve fibers
-modified cardiac muscle fibers(ans)
but impulse in heart is conducted by autonomic nervous system right? so in tht case option 1 must be right....and wht are these modified cardiac muscle fibers anyway
 
Upvote 0 Downvote
PooKan said:
impulse conducting mechanism in heart is composed of
-autonomic nerve fibers
-modified cardiac muscle fibers(ans)
but impulse in heart is conducted by autonomic nervous system right? so in tht case option 1 must be right....and wht are these modified cardiac muscle fibers anyway
Click to expand...

It means the SA and AV nodes,bundle of His,purkinje fibres etc. Thats what conducts the impulse in heart..so right.
 
Upvote 0 Downvote
skeletal muscle enlarges with prolonged activity as a consequence of
-differentiation of myoblasts
-mitotic division of muscle fibers
-increase in endomysial CT
-increase in sarcoplasm and in NUMBER of myofibrils of existing muscle fibers (ans)
how? skeletal muscle enlarges due to hypertrophy not hyperplasia right?
 
Upvote 0 Downvote
PooKan said:
skeletal muscle enlarges with prolonged activity as a consequence of
-differentiation of myoblasts
-mitotic division of muscle fibers
-increase in endomysial CT
-increase in sarcoplasm and in NUMBER of myofibrils of existing muscle fibers (ans)
how? skeletal muscle enlarges due to hypertrophy not hyperplasia right?
Click to expand...

only hypertrophia. there is no hyperplasia
 
Upvote 0 Downvote
PooKan said:
i still did not understand...can u explain me again plz..thank u
Click to expand...
Myofiber is polinucleated "cell" that was developed from many mononucleated myocytes. Myofibrill is component of myofiber. Myofibril is organell in the cell.
Hypertrophia is increased size or number of organells (myofibrils in this case)
Hyperplasia - increased number of cells (myofibers).
 
Upvote 0 Downvote
Hatico said:
Myofiber is polinucleated "cell" that was developed from many mononucleated myocytes. Myofibrill is component of myofiber. Myofibril is organell in the cell.
Hypertrophia is increased size or number of organells (myofibrils in this case)
Hyperplasia - increased number of cells (myofibers).
Click to expand...

👍 Rightly said Hatico!
 
Upvote 0 Downvote
Hatico said:
Myofiber is polinucleated "cell" that was developed from many mononucleated myocytes. Myofibrill is component of myofiber. Myofibril is organell in the cell.
Hypertrophia is increased size or number of organells (myofibrils in this case)
Hyperplasia - increased number of cells (myofibers).
Click to expand...
thank u 🙂
 
Upvote 0 Downvote
if the spinal tract of 5th CN were to to sectioned at the level of caudal medulla , which of the foll would be most affected?
-taste
-proprioception
-pain from ipsilateral side of face(ans)
-light touch from contralteral saide of face
sensation s carried to contralateral side of brain right?
 
Upvote 0 Downvote
PooKan said:
if the spinal tract of 5th CN were to to sectioned at the level of caudal medulla , which of the foll would be most affected?
-taste
-proprioception
-pain from ipsilateral side of face(ans)
-light touch from contralteral saide of face
sensation s carried to contralateral side of brain right?
Click to expand...

Caudal subnucleus (one of the spinal nuclei) transforms temperature and pain sensation, light touch - chief of pontine, proprioception - mesencephalis nucleus. So, answer is only "pain".
I cannot say anything about side of sensation, but rule about contralateral pain sensation is valid only for spinal nerves. There is different rule for cranial nerves. It depends on level of section - sometimes ipsilateral, sometimes contralatral loose of sensation.
 
Upvote 0 Downvote
The non-working pathway of the maxillary cusps on the mandibular posterior teeth is toward the

  1. distofacial.ans
  2. distolingual.
  3. mesiofacial.
  4. mesiolingual.
😱it shoud be mesiolingual. Non- working pathway of the mandibular cusps on the maxillary posterior teeth is toward the distofacial, correct?
 
Upvote 0 Downvote
Advertisement - Members don't see this ad
Hatico said:
The non-working pathway of the maxillary cusps on the mandibular posterior teeth is toward the

  1. distofacial.ans
  2. distolingual.
  3. mesiofacial.
  4. mesiolingual.
😱it shoud be mesiolingual. Non- working pathway of the mandibular cusps on the maxillary posterior teeth is toward the distofacial, correct?
Click to expand...

Mesiolingual is the pathway of mandibular cusps....opposite direction for maxilla...therefore distofacial!👍
 
Upvote 0 Downvote
in the embyro, ductus connects the
-rt atrium with lf atrium
-umbilical vein to inf venacava
-left pulmonary artery to aortic arch (ans)
-rt pul artery to aortic arch

now they havent mentioned if its ductus arteriosus or ductus venosus...so it can either be option 2( which s venosus) or option 3 (arteriosus) ....how do rule out btw them?
 
Upvote 0 Downvote
PooKan said:
in the embyro, ductus connects the
-rt atrium with lf atrium
-umbilical vein to inf venacava
-left pulmonary artery to aortic arch (ans)
-rt pul artery to aortic arch

now they havent mentioned if its ductus arteriosus or ductus venosus...so it can either be option 2( which s venosus) or option 3 (arteriosus) ....how do rule out btw them?
Click to expand...

Yeah you are right i believe the question is incomplete or wrong.
 
Upvote 0 Downvote
1)The proper axial inclination of the maxillary cuspid?

2)When one presses the tongue tip against the anterior (incisor) teeth, which of the muscles must contract?
 
Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

D
Passed the INBDE (March 2026) – 2 Month Study Breakdown
Replies
0
Views
2K
dental10101
D
C
Passed INBDE on My First Attempt – Study Breakdown (Foreign-Trained Dentist)
Replies
0
Views
2K
cooldoc21
C
A Sweet Tooth
  • Question Question
INBDE or NBDE part II?
Replies
0
Views
2K
A Sweet Tooth
A Sweet Tooth
D
  • Question Question
How to Pass NBDE Part 2
Replies
6
Views
6K
NGLTTG01
N
R
Failed NBDE 2 twice.
Replies
3
Views
6K
Bebars
B