Please Answer These..physio/biochem Question's

[doc12]

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hi.
PLEASE ANSWER THE FOLLOWING question, possibly with brief explaination..

1..which of the following best describes GTP binding protein(G- protein)
a..are important componenet of steroid hormone signal transduction
b..catalyze reaction with diaglycerol
c.. are tightly bound to adenylate cyclase
d..usually inactivate protein kinase
e..are membrane proteins

2..which of following best applies for saliva??
a..phosphateis main buffer
b..supplies calcuim phosphate for remineralization.
c..undersaturated with respect to hydroxyapatite at neutral pH

3..in contractile cycle , dissociation of actomyosin complex result from
a..ATP hydrolysis
b..ATP hydrolysis products
c..tilting of myosin heads(cross-bridging)

4.each is expected to be active during fatty acid synthesis,except
a..TCA
B..BETA OXIDATION
C..amino acid catabolism

5..hormones that exert their effect thru activation of second messenger are
a.usually water soluble peptide/proteins hormone
b..bound to cytoplasmic hormone receptors
c..secreted by ovaries,testes,adrenal cortex
d..lipophilic

THANX in advance

 

[xinxie99]

1. e. G-protein is important in protein, enzyme synthesis; bound to GTP/GDP; can activate or deactivate adenylate cyclase
2. c. pls look up in a physio book.
3. c. physio book about muscle contract, usually all have pic. about it.
4. c. TCA and beta oxidation are needed in fatty acid synthesis (biochem)
5. a. hormones using second messenger could not pass through the cell membrane because of their polarity. They bound to the receptors on the membrane and are not limited to the organs mentioned in choice C.

 

[doc12]

Hello Xinxie99,
Thank You Very Much

 

[drarch]

1. e. G-protein is important in protein, enzyme synthesis; bound to GTP/GDP; can activate or deactivate adenylate cyclase
2. c. pls look up in a physio book.
3. c. physio book about muscle contract, usually all have pic. about it.
4. c. TCA and beta oxidation are needed in fatty acid synthesis (biochem)
5. a. hormones using second messenger could not pass through the cell membrane because of their polarity. They bound to the receptors on the membrane and are not limited to the organs mentioned in choice C.

hi

i m not getting 4th quest. can u plz explain. as i m confused, i think it shld be beta oxidation . i m really confused . plz explain it

 

[dent02]

ans for q.4 is c
Acetyl CoA provides provides carbon atoms for Fatty acid Synthesis.End product of Beta oxidation is Acetyl coA.

 

[drarch]

but amino acid catabolism also produced acetyl coa & TCA cycle produced citrate which is used in fatty acid synthesis. i think synthesis & breakdown can not take place simultaneously so ans shd be beta oxidation.

plz correct me if im wrong

 

[drarch]

plz ,anybody give me ans of this q with explanation

thanx in advance.

 

[syk]

Hi,

Even I thought the ans is Beta oxidation.Because Malonyl coA inhibits carnitine acyltransferase I thus inhibiting entry of acyl groups into mitochondria matrix and thus inhibits oxidation when synthesis occurs.Correct me if am wrong.

 

[fido!]

b ox is the answer!

 

[drarch]

thanx sky & prady. now it is clear.

 

[dent02]

absorption of ca from small intestine is increased by

1.ingestion of fat
2.high phosphate intake
3.adminstration of vit a
4.lowering the ph in the intestine
5.adminstration of parathyroid hormone

is the answer 5.

appreciate any inputs.

 

[drkum1]

absorption of ca from small intestine is increased by

1.ingestion of fat
2.high phosphate intake
3.adminstration of vit a
4.lowering the ph in the intestine
5.adminstration of parathyroid hormone

is the answer 5.

appreciate any inputs.

I guess its 4. Correct me

 

[dent02]

I guess its 4. Correct me

thank you for your response. Yes the answer given is 4.,but PTH increases calcium absorption by activating vit.D

i am confused,pls let me know .

 

[fido!]

i guess the ans. is 5.if u lower the ph,hcl is produced which will activate pepsinogen to active pepsin.how hcl is related to ca++ absorption i.e.related to low ph?correct me if i'm wrong!where did u find the answer choice given as 4?let us know!

thank you for your response. Yes the answer given is 4.,but PTH increases calcium absorption by activating vit.D

i am confused,pls let me know .

 

[dent02]

i guess the ans. is 5.if u lower the ph,hcl is produced which will activate pepsinogen to active pepsin.how hcl is related to ca++ absorption i.e.related to low ph?correct me if i'm wrong!where did u find the answer choice given as 4?let us know!

Thank You!
This question is in question Paper released 1980(july 1978).Question #55.(physio&biochem section).

 

[dent02]

the normal blood-bicarbonate is 20:1.A patient with 10:1 ratio is in

1.compensated alkalosis
2.compensated acidosis
3.uncompensated alkalosis
4.uncompensated acidosis
5.none of the above.pt's ratio within normal limits.

is the answer 1.pls correct me

 

[dent02]

Thank You!
This question is in question Paper released 1980(july 1978).Question #55.(physio&biochem section).

.

But I guess ans.is 4
supporting:http://www.healthmart.com/supplements/calcium-absorption.html
i just found it ,hence I posted it.

 

[dent02]

Acetyl choline is released at allof the following expect

1.sympathetic ganglia
2.parasympathetic ganglia
3.somatic efferents to skeletal muscle
4.terminal sympathetic fibres to heart
5.terminal sympatheticfibres to adrenal medulla

is the ans 5.(answer given is 4).pls correct me

 

[drkum1]

Acetyl choline is released at allof the following expect

1.sympathetic ganglia
2.parasympathetic ganglia
3.somatic efferents to skeletal muscle
4.terminal sympathetic fibres to heart
5.terminal sympatheticfibres to adrenal medulla

is the ans 5.(answer given is 4).pls correct me

The answer is 4

 

[dent02]

The answer is 4

thank you. Can pls help me with the other question also.

the normal blood-bicarbonate is 20:1.A patient with 10:1 ratio is in

1.compensated alkalosis
2.compensated acidosis
3.uncompensated alkalosis
4.uncompensated acidosis
5.none of the above.pt's ratio within normal limits.

is the answer 1.pls correct me

 

[dent02]

Quote:
Originally Posted by dent02
Acetyl choline is released at allof the following expect

1.sympathetic ganglia
2.parasympathetic ganglia
3.somatic efferents to skeletal muscle
4.terminal sympathetic fibres to heart
5.terminal sympatheticfibres to adrenal medulla

is the ans 5.(answer given is 4).pls correct me



The answer is 4

terminal sympathetic fibres to adrenal medulla -norepinephrine?
pls correct me .I am confused .

 

[dent02]

thank you. Can pls help me with the other question also.

the normal blood-bicarbonate is 20:1.A patient with 10:1 ratio is in

1.compensated alkalosis
2.compensated acidosis
3.uncompensated alkalosis
4.uncompensated acidosis
5.none of the above.pt's ratio within normal limits.

is the answer 1.pls correct me

.

Some one please provide the answer and explanation for this question.

thank you