Questions from 99 paper..

[rtvj]

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hi all
if anyone knows the right answer with reason if possible for the foll questions..pls post it soon....thanks!!!

1. Which of the foll represents a rxn involved in gluconeogenesis from pyruvate and also is an anaplerotic rxn that primes the TCA cycle?

a.Pyr--OAA
b.Pyr--Acetyl CoA
c.PEP--Pyruvate
d.OAA--Pyruvate
e.Pyr--Lactate

2.Most Abundant Glycosaminoglycan seen in human teeth?

a.Amylose
b.Keratin
c.Heparin
d.Cellulose
e.Chondroitin sulfate

3.Reduced renal Blood flow can cause hypertension by one of the foll:

a.Release of Renin
b.Reflex Vasoconstriction
c.Retention of K+ in blood
d.Increase Epinephrine

4.Cell Membrane is least permeable to

a.H20
b.Na
c.O2
d.Ethanol
e.Glycerol

 

[scha2005]

hi all
if anyone knows the right answer with reason if possible for the foll questions..pls post it soon....thanks!!!

1. Which of the foll represents a rxn involved in gluconeogenesis from pyruvate and also is an anaplerotic rxn that primes the TCA cycle?

a.Pyr--OAA
b.Pyr--Acetyl CoA
c.PEP--Pyruvate
d.OAA--Pyruvate
e.Pyr--Lactate

2.Most Abundant Glycosaminoglycan seen in human teeth?

a.Amylose
b.Keratin
c.Heparin
d.Cellulose
e.Chondroitin sulfate

3.Reduced renal Blood flow can cause hypertension by one of the foll:

a.Release of Renin
b.Reflex Vasoconstriction
c.Retention of K+ in blood
d.Increase Epinephrine

4.Cell Membrane is least permeable to

a.H20
b.Na
c.O2
d.Ethanol
e.Glycerol

hi
answer to q 1
is
pyruvate to OAA

answer to q 2
chondratin sulfate is most abundant

answer to q no 3
release of renin

answer to q no 4
cell membrane least permeable to Na

hope im right 🙂
if u need any explanation of these let me knw 👍

 

[scha2005]

can some one explain some biochem q's

a mouth rinse contains .o5%F. which of the following representsconc expressed in ppm
a---5
b----50
c----500
d----5000

Q 2 a urine sample with pH 5.7 has H ion conc of approx
a--2x*10^(-3)
b 2x10^[-5]
c 2x10^[-2]

Q 3 FOR which is first gp of following pairs more likely to be located on the surface of globular protein than second group of pair?
a--CONH2 -COO-
B -CH3 -CH3[CH3]2
C---CH2OH -NH4+
D CH3 -CH2OH
E CH2SH -COO-

thanks in advance 🙂

 

[scha2005]

can anyone answer these q's
Q1 morphological variations worsening prognosis for existing pdl's
a--fused roots
b --excessively long roots
c--amelogenesis imperfecta
d shoveling trait in cental incisors

i think answer shd be excessively long roots!!

Q 2 which of the following restorations least likely to interfere with patients phsiologic maximum intercuspal position contacts
a--distolingual class 111 on max rt canine
b--MO on mand rt 1st premolar
c MOD on maxillary rt second premolar
d MO on max left first molar

i think answer to be [a]

Q 3 THE CONTACT area that is most nearly circular is located on crown of which of the following max premolars
a mesial of 1st
b distal of 1st
c mesial of 2nd
d distal of 2nd

well i think answer shd be distal of 2nd???

Q 4 occlusal surface of Y type mandibular 2nd PM ,the Y pattern is formed by
whcih of the following grooves
a mesial and distal
b lingual & central
c mesial,distal & facial
d mesial ,distal & central
e facial ,lingual &central

i think answer to be central and lingual

Q 5 when examining the normal mandibular arch from saggital view ,whiich inclination of teeth is observed?
a both ant &post teeth -mesially inclined
b both ant & post teeth --distally inclined
c ant teeth -distally & post teeth --mesially
d ant teeth -mesially & post teeth --distallly
e ant & post teeth striaght

also can anyone re write q no 128,137,141 of paper 1999[biochem] they are not clearly printed in my paper


thanks in advance 🙂

 

[sjchand]

can anyone answer these q's
Q1 morphological variations worsening prognosis for existing pdl's
a--fused roots
b --excessively long roots
c--amelogenesis imperfecta
d shoveling trait in cental incisors
ans is A
i think answer shd be excessively long roots!!

Q 2 which of the following restorations least likely to interfere with patients phsiologic maximum intercuspal position contacts
a--distolingual class 111 on max rt canine
b--MO on mand rt 1st premolar
c MOD on maxillary rt second premolar
d MO on max left first molar
Ans is B
i think answer to be [a]

Q 3 THE CONTACT area that is most nearly circular is located on crown of which of the following max premolars
a mesial of 1st
b distal of 1st
c mesial of 2nd
d distal of 2nd
Ans is A
well i think answer shd be distal of 2nd???

Q 4 occlusal surface of Y type mandibular 2nd PM ,the Y pattern is formed by
whcih of the following grooves
a mesial and distal
b lingual & central
c mesial,distal & facial
d mesial ,distal & central
e facial ,lingual &central

Ans is D
i think answer to be central and lingual

Q 5 when examining the normal mandibular arch from saggital view ,whiich inclination of teeth is observed?
a both ant &post teeth -mesially inclined
b both ant & post teeth --distally inclined
c ant teeth -distally & post teeth --mesially
d ant teeth -mesially & post teeth --distallly
e ant & post teeth striaght
Ans is A
also can anyone re write q no 128,137,141 of paper 1999[biochem] they are not clearly printed in my paper


thanks in advance 🙂

Correct me if i am wrong

 

[sjchand]

can some one explain some biochem q's

a mouth rinse contains .o5%F. which of the following representsconc expressed in ppm
a---5
b----50
c----500
d----5000
Ans is 5000
Q 2 a urine sample with pH 5.7 has H ion conc of approx
a--2x*10^(-3)
b 2x10^[-5]
c 2x10^[-2]

Q 3 FOR which is first gp of following pairs more likely to be located on the surface of globular protein than second group of pair?
a--CONH2 -COO-
B -CH3 -CH3[CH3]2
C---CH2OH -NH4+
D CH3 -CH2OH
E CH2SH -COO-

thanks in advance 🙂

rest of them i am not sure

 

[rtvj]

can some one explain some biochem q's

a mouth rinse contains .o5%F. which of the following representsconc expressed in ppm
a---5
b----50
c----500
d----5000

1 % = 10,000 ppm
therefore .05 % = 500 ppm

Check out the website for the conversion:

http://www.ilpi.com/msds/ref/concentration.html

 

[rtvj]

Q 2 which of the following restorations least likely to interfere with patients phsiologic maximum intercuspal position contacts
a--distolingual class 111 on max rt canine
b--MO on mand rt 1st premolar
c MOD on maxillary rt second premolar
d MO on max left first molar

i think answer to be [a]

Why cant the answer be b???
In normal intercuspation itself there is no contact of the MMR of mand 1st premolar with any other tooth.

 

[rtvj]

thanks for the answers!

hi
answer to q 1
is
pyruvate to OAA

answer to q 2
chondratin sulfate is most abundant

answer to q no 3
release of renin

answer to q no 4
cell membrane least permeable to Na

hope im right 🙂
if u need any explanation of these let me knw 👍

 

[scha2005]

hi all
if anyone knows the right answer with reason if possible for the foll questions..pls post it soon....thanks!!!

1. Which of the foll represents a rxn involved in gluconeogenesis from pyruvate and also is an anaplerotic rxn that primes the TCA cycle?

a.Pyr--OAA
b.Pyr--Acetyl CoA
c.PEP--Pyruvate
d.OAA--Pyruvate
e.Pyr--Lactate

2.Most Abundant Glycosaminoglycan seen in human teeth?

a.Amylose
b.Keratin
c.Heparin
d.Cellulose
e.Chondroitin sulfate

3.Reduced renal Blood flow can cause hypertension by one of the foll:

a.Release of Renin
b.Reflex Vasoconstriction
c.Retention of K+ in blood
d.Increase Epinephrine

4.Cell Membrane is least permeable to

a.H20
b.Na
c.O2
d.Ethanol
e.Glycerol

Q 1
if u see fate of pyruvate,
pyruvate-----------> oxaloacetic acid[ which goes to gluconeogenesis]
and the enzyme required is PDH
and if u see kaplan its written there
oxaloacetate is the intermediate step in gluconeogenesis
[ hope its not confusing]

Q3
its renin coz
when there is reduced renal blood flow ,juxta glomerular cells in the kidney stimulates teh renin which converts angiotensinogen 1 ----->angiotensinogen 11 which acts on DCT of kidney to release more aldosterone and thus more Na retention and leads to hypertension
[hope im clear]

 

[scha2005]

Q 2 which of the following restorations least likely to interfere with patients phsiologic maximum intercuspal position contacts
a--distolingual class 111 on max rt canine
b--MO on mand rt 1st premolar
c MOD on maxillary rt second premolar
d MO on max left first molar

i think answer to be [a]

Why cant the answer be b???
In normal intercuspation itself there is no contact of the MMR of mand 1st premolar with any other tooth.

thanks
it makes sense and is clear to me 🙂

 

[scha2005]

Correct me if i am wrong

hi can u explain why did u choose
fused roots as answer
does fused roots affect pdl d's prognosis and how?
also im pretty postive about answer Y shaped sulcus formed in Md 2nd PM
coz the Y shaped grrove is formed by central [which is crescent shaped and has mesial and distal developmental grooves going in mesial and distal direction from centre] and the lingual which goes lingually between ML & DL cusps!!
so according to me answer shd be lingual and central
let me knw how u arrived to ur answer
i actually checked in wheelers too

 

[scha2005]

Correct me if i am wrong

also if u see q 3
you said the most circular contact areas is in Mx 1st PM
can u tell me how?
i checked in wheelers ,it says that mesial contact area contacts MMR at almost rt angle[MX 1st PM]
and is distal is more rounded
also if u see since 1st PM is more pointed and 2nd Mx PM is more rounded so isnt the anser to be distal of Mx 2nd PM
PLZ DO EXPLAIN

 

[smilein]

Fused root ,all the pdl fibres are in proximity to a single /a fused root ,so destruction started at one ,will progresively damage the whole intact fibres
but in case of multiple roots,destuction of one root fibres is localised ,the rest of the roots have sound pdl fibres .means no destruction is spread .hence prognosis is good,where as fused roots all fibres r destoyed ,n so poor prognosis.
hope im not wrong ,if any mistake plz.correct me.

hi can u explain why did u choose
fused roots as answer
does fused roots affect pdl d's prognosis and how?
also im pretty postive about answer Y shaped sulcus formed in Md 2nd PM
coz the Y shaped grrove is formed by central [which is crescent shaped and has mesial and distal developmental grooves going in mesial and distal direction from centre] and the lingual which goes lingually between ML & DL cusps!!
so according to me answer shd be lingual and central
let me knw how u arrived to ur answer
i actually checked in wheelers too

 

[rtvj]

thanks for the explanation!!
👍

Q 1
if u see fate of pyruvate,
pyruvate-----------> oxaloacetic acid[ which goes to gluconeogenesis]
and the enzyme required is PDH
and if u see kaplan its written there
oxaloacetate is the intermediate step in gluconeogenesis
[ hope its not confusing]

Q3
its renin coz
when there is reduced renal blood flow ,juxta glomerular cells in the kidney stimulates teh renin which converts angiotensinogen 1 ----->angiotensinogen 11 which acts on DCT of kidney to release more aldosterone and thus more Na retention and leads to hypertension
[hope im clear]

 

[scha2005]

Fused root ,all the pdl fibres are in proximity to a single /a fused root ,so destruction started at one ,will progresively damage the whole intact fibres
but in case of multiple roots,destuction of one root fibres is localised ,the rest of the roots have sound pdl fibres .means no destruction is spread .hence prognosis is good,where as fused roots all fibres r destoyed ,n so poor prognosis.
hope im not wrong ,if any mistake plz.correct me.

THANKS
for explanations ...its clear to me 🙂

 

[scha2005]

Q 2 which of the following restorations least likely to interfere with patients phsiologic maximum intercuspal position contacts
a--distolingual class 111 on max rt canine
b--MO on mand rt 1st premolar
c MOD on maxillary rt second premolar
d MO on max left first molar

i think answer to be [a]

Why cant the answer be b???
In normal intercuspation itself there is no contact of the MMR of mand 1st premolar with any other tooth.

hi
we had discussed this q earlier and came to this answer
but today i was going through the q bank
and saw that according to their cuspal relations ,
the mandibular 1st PM occludes only with MMR of its class counterpart but NOT WITH CANINE
if we apply that to this q
we see abswer 1 is correct
plz correct if im interpreting this wrong 🙂