part 1 question

[shuntyman]

.can any one elaborate on the following question

wht maintians the primary , secondary ,tertiary and quarternary strcture of proteins?

.

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[passiondentistr]

okk I hope this is wat u r looking for..
-- Primary proteins are maintained by a Peptide bond
--- secondary proteins are maintained by the Hydrogen Bonding
----Tertiary proteins are maintained by the Disulphide Bond, hydrogen bond , Hydrophobic Interactions and the Ionic bond too
---- Quaternary proteins are maintained by same as tertiary but they have noncovalent interactions.

 

[skabbaraju]

okk I hope this is wat u r looking for..
-- Primary proteins are maintained by a Peptide bond
--- secondary proteins are maintained by the Hydrogen Bonding
----Tertiary proteins are maintained by the Disulphide Bond, hydrogen bond , Hydrophobic Interactions and the Ionic bond too
---- Quaternary proteins are maintained by same as tertiary but they have noncovalent interactions.

Looks almost perfect except for the last statement, the ones mentioned in tertiary proteins are non-covalent as well, so what do you mean by non-covalent interactions in Quarternary proteins.?

 

[passiondentistr]

hey ya u r right .. thanks for correcting m
The protein may consists of 2 or more polypeptide chains which may b structurally similar or dissimilar.n now the arrangement of these polypeptide units is called the quaternary structure of protein .n these subunits will hv all those noncovalent interactions.

 

[impaction]

hey ya u r right .. thanks for correcting m
The protein may consists of 2 or more polypeptide chains which may b structurally similar or dissimilar.n now the arrangement of these polypeptide units is called the quaternary structure of protein .n these subunits will hv all those noncovalent interactions.

no thats wrong
the disulphide bonds present in tertiary structure are covalent bonds

 

[shuntyman]

wht r the predominant bonds in tertiary structure of protein ?????
a. disulfide
b. hydrogen


wht r the predominant bonds in b-pleated sheets ?????
a. disulfide
b. hydrogen

wht r the predominant bonds in a- helix ?????
a. disulfide
b. hydrogen

 

[skabbaraju]

wht r the predominant bonds in tertiary structure of protein ?????
a. disulfide
b. hydrogen


wht r the predominant bonds in b-pleated sheets ?????
a. disulfide
b. hydrogen

wht r the predominant bonds in a- helix ?????
a. disulfide
b. hydrogen[/quote]

 

[passiondentistr]

absolutely right

 

[shuntyman]

what is the coenzyme that is used in reduction?a. biotin
b. nadph
c. nadh
d. fad

 

[porcelain258]

what is the coenzyme that is used in reduction?a. biotin
b. nadph
c. nadh
d. fad

 

[shuntyman]

1) What is the net charge on glutamic acid at a ph of 1 ?

a) +2
b) +1
c) 0
d) -1
e) -2


what is the coenzyme that is used in reduction?a. biotin
b. nadph
c. nadh
d. fad


pls ans with explanation.......

 

[impaction]

what is the coenzyme that is used in reduction?a. biotin
b. nadph
c. nadh
d. fad

depends where it occurs...............
in mitochondria or cytoplasm

 

[impaction]

1) What is the net charge on glutamic acid at a ph of 1 ?

a) +2
b) +1
c) 0
d) -1
e) -2

glutamic acid is weak acid, when it is kept in strong acid <ph1> it absorbs H+......
as a result of this , net charge on it is +1


what is the coenzyme that is used in reduction?a. biotin
b. nadph
c. nadh
d. fad
depends where the reaction occurs.
different in mitochondria & different in cytoplasm

 

[passiondentistr]

plzz correct m
The first bone formed after injury is Woven bone
The bone formed after orthodontic destruction is also Woven bone

 

[passiondentistr]

now immunoglobulins..
In saliva SigA
in Gingival crevicular fluid , Ig G
In CSF , Ig G

 

[impaction]

now immunoglobulins..
In saliva SigA
in Gingival crevicular fluid , Ig G
In CSF , IgG

thats true.... if there is no acute infectiion........
to add on to that...
in saliva IgG is also present...

 

[impaction]

plzz correct m
The first bone formed after injury is Woven bone
The bone formed after orthodontic destruction is also Woven bone

also known as spongy bone

 

[passiondentistr]

no thats wrong
the disulphide bonds present in tertiary structure are covalent bonds

Hey ya so i was right previously then ,
yes the Tertiary proteins will have Disulphide bonds which are the Weak covalent bonds
whereas in the Quaternary structure, there is non-covalent interactions.

 

[toothfairy2011]

Primary cementum, secondary dentin, and cancellous bone have all of the following characteristics in commone EXCEPT:

1. showing growth
2. containing cells
3. resorbing under pressure
4. being derived from mesenchym

Answer: 2 (Booklet 1-E)

Don't all of these contain cells? I thought it was 3, since cementum is less likely to resorb than bone.

Thoughts?

 

[impaction]

Primary cementum, secondary dentin, and cancellous bone have all of the following characteristics in commone EXCEPT:

1. showing growth
2. containing cells
3. resorbing under pressure
4. being derived from mesenchym

Answer: 2 (Booklet 1-E)

Don't all of these contain cells? I thought it was 3, since cementum is less likely to resorb than bone.

Thoughts?

its too late , m little tired,
will answer 2mrw

 

[UDUSA]

Hi there,
I think the 2nd option is the right one since the primary cementum is acellular.
Also, anyone pls tell me what are ASDA questions?

 

[plan]

wht r the predominant bonds in a- helix ?????
a. disulfide
b. hydrogen[/

alpha helical structure of protein is stabilised by ?? bond

 

[skabbaraju]

its too late , m little tired,
will answer 2mrw

I would go with growth. Ans: A

 

[toothfairy2011]

Thanks UDUSA. That helps.

Regarding ASDA Questions, ASDA provides old released exams. See link below.

http://68.20.243.219/asda/members_o...rder.asp?action=catalog&catalog=NBR1&aff=ASDA