q in biochem

[gp120]

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production of phosphophenolpruvate carboxykinase is stimulated by

insulin,cortisol,aldosterone,somatotropin

which of the following statement best describe the primary role of calcium in activation of cardiac muscle.
1.causes depolarization of the muscle
2.couple myosin and actin to form actinomyosin
3.reduced inhibition of tropomyosin up the myofilaments
4.activate myosin molecules so that they can interact with actin filaments

which of the following represents the principal allosteric regulator of pyruvate metabolism in the liver

1.ATP 2. NAD 3. CITRATE 4.CYCLIC AMP 5. ACETYL COA

which of the following statetmants best describes the activity of DNA ligase
1.seals single-stranded nicks in DNA
2.prevents the polymerase from falling off the DNA

need help for this q 🙁 & explanation thank you

 

[ridge]

production of phosphophenolpruvate carboxykinase is stimulated by

insulin,cortisol,aldosterone,somatotropin
ANS IS CORTISOL

which of the following statement best describe the primary role of calcium in activation of cardiac muscle.
1.causes depolarization of the muscle
2.couple myosin and actin to form actinomyosin
3.reduced inhibition of tropomyosin up the myofilaments
4.activate myosin molecules so that they can interact with actin filaments
ans is 4

which of the following represents the principal allosteric regulator of pyruvate metabolism in the liver

1.ATP 2. NAD 3. CITRATE 4.CYCLIC AMP 5. ACETYL COA
ans ATP

which of the following statetmants best describes the activity of DNA ligase
1.seals single-stranded nicks in DNA
2.prevents the polymerase from falling off the DNA
ans is 1
let me know if i m wrong.

 

[drkum1]

production of phosphophenolpruvate carboxykinase is stimulated by

insulin,cortisol,aldosterone,somatotropin
ANS IS CORTISOL

which of the following statement best describe the primary role of calcium in activation of cardiac muscle.
1.causes depolarization of the muscle
2.couple myosin and actin to form actinomyosin
3.reduced inhibition of tropomyosin up the myofilaments
4.activate myosin molecules so that they can interact with actin filaments
ans is 4

which of the following represents the principal allosteric regulator of pyruvate metabolism in the liver

1.ATP 2. NAD 3. CITRATE 4.CYCLIC AMP 5. ACETYL COA
ans ATP

which of the following statetmants best describes the activity of DNA ligase
1.seals single-stranded nicks in DNA
2.prevents the polymerase from falling off the DNA
ans is 1
let me know if i m wrong.

Hi,
1) cortisol
3)Acetyl coA is the principal allosteric regulator of pyruvate metabolism in the liver.
4) seals single-stranded nicks in DNA

 

[gp120]

thank you for the answers ridge&drkum1.

drkum1 cud u pls explain the answer why acetyl coa not ATP.

 

[drarch]

thank you for the answers ridge&drkum1.

drkum1 cud u pls explain the answer why acetyl coa not ATP.

pyruvate converted to acetyl co-A by PDH .activity of PDH is regulated mainly by acetyl coA & nadh as they r primary inhibitors of PDH activity. PDh undergoes phophorylation &associated with protein kinase& kinase is activated by coA & NADH.

im not sure , correct me if i m wrong

 

[fc.pride]

production of phosphophenolpruvate carboxykinase is stimulated by

insulin,cortisol,aldosterone,somatotropin

which of the following statement best describe the primary role of calcium in activation of cardiac muscle.
1.causes depolarization of the muscle
2.couple myosin and actin to form actinomyosin
3.reduced inhibition of tropomyosin up the myofilaments
4.activate myosin molecules so that they can interact with actin filaments

i think the answer is 1 rather than 4. ca2+ binds to troponin and not really mysoin. it allows myosin to bind to actin by moving it out of the way.
it does have slow ca channels in heart that establish the pace of depolarizaton of the heart. pls correct me if i am wrong.

 

[ridge]

production of phosphophenolpruvate carboxykinase is stimulated by

i think the answer is 1 rather than 4. ca2+ binds to troponin and not really mysoin. it allows myosin to bind to actin by moving it out of the way.
it does have slow ca channels in heart that establish the pace of depolarizaton of the heart. pls correct me if i am wrong.

HI see ,calcium causes alteration in myosin so that it binds to actin,its a role of calcium.

 

[ar78cx]

1- insulin
2.-activate myosin molecules so that they can interact with actin filaments
3. ACETYL COA
4.seals single-stranded nicks in DNA

 

[drkum1]

1)Which of the following compounds is an intermediate in the biosynthesis of cholesterol?
a)squalene
b)hexosamine
c)cholic acid
d)pregnanediol
e)deoxycholic acid

2)During nuclear processing of hnRNA to mRNA, the portion of the molecule that is removed is the
a)exon
b)anticodon
c)intron
d)codon
e)5'cap

 

[mahima_dentist]

production of phosphophenolpruvate carboxykinase is stimulated by

insulin,cortisol,aldosterone,somatotropin

which of the following statement best describe the primary role of calcium in activation of cardiac muscle.
1.causes depolarization of the muscle
2.couple myosin and actin to form actinomyosin
3.reduced inhibition of tropomyosin up the myofilaments
4.activate myosin molecules so that they can interact with actin filaments

i think the answer is 1 rather than 4. ca2+ binds to troponin and not really mysoin. it allows myosin to bind to actin by moving it out of the way.
it does have slow ca channels in heart that establish the pace of depolarizaton of the heart. pls correct me if i am wrong.

Hi,
I think the answer is 3
coz Ca binds to the troponin(in striated muscles) and calmodulin(in smooth muscles) and cause some kind of conformatory change which causes tropomyosin to move away from the active site of the actin which otherwise in relaxed states of the muscles is covered by tropomyosin..and then once the active site is available on the actin ,myosin's head can bind to that..correct me plz if am wrong
mahima

 

[NBDE@hotmail]

1)Which of the following compounds is an intermediate in the biosynthesis of cholesterol?
a)squalene
b)hexosamine
c)cholic acid
d)pregnanediol
e)deoxycholic acid
Ans-a
2)During nuclear processing of hnRNA to mRNA, the portion of the molecule that is removed is the
a)exon
b)anticodon
c)intron
d)codon
e)5'cap

Ans-c

 

[NBDE@hotmail]

i mean
1-a
2-c

 

[drkum1]

i mean
1-a
2-c

Thank you ... Can you explain...

 

[drkum1]

1- insulin
2.-activate myosin molecules so that they can interact with actin filaments
3. ACETYL COA
4.seals single-stranded nicks in DNA

Hey,
can you explain why it is insulin?

 

[drkum1]

1) An example of primary active transport is the movement of
a)glucose into muscle
b)potassium into nerves cell
c)protein across capillaries
d)sodium into endothelial cell
e)oxygen across the alveolar wall

2) A dental patient presents with bluish discoloration of the mucous membranes indicative of cyanosis. This condition is most likely the result of
a)increased Pco2
b)a decreased hemoglobin concentration
c)a decreased red blood cell concentration
d)increased levels of reduced hemoglobin
e)decreased blood flow to the affected area

3)Which of the following hormones generally increase the rate of anabolic(biosynthetic reaction?
a)insulin
b)glucagon
c)cortisol
d)epinephrine
e)somatostatin

 

[NBDE@hotmail]

1) An example of primary active transport is the movement of
a)glucose into muscle
b)potassium into nerves cell
c)protein across capillaries
d)sodium into endothelial cell
e)oxygen across the alveolar wall
ans-b
2) A dental patient presents with bluish discoloration of the mucous membranes indicative of cyanosis. This condition is most likely the result of
a)increased Pco2
b)a decreased hemoglobin concentration
c)a decreased red blood cell concentration
d)increased levels of reduced hemoglobin
e)decreased blood flow to the affected area
ans-e (i guess)
3)Which of the following hormones generally increase the rate of anabolic(biosynthetic reaction?
a)insulin
b)glucagon
c)cortisol
d)epinephrine
e)somatostatin

ans-a

 

[mahima_dentist]

1) An example of primary active transport is the movement of
a)glucose into muscle
b)potassium into nerves cell
c)protein across capillaries
d)sodium into endothelial cell
e)oxygen across the alveolar wall

2) A dental patient presents with bluish discoloration of the mucous membranes indicative of cyanosis. This condition is most likely the result of
a)increased Pco2
b)a decreased hemoglobin concentration
c)a decreased red blood cell concentration
d)increased levels of reduced hemoglobin
e)decreased blood flow to the affected area

3)Which of the following hormones generally increase the rate of anabolic(biosynthetic reaction?
a)insulin
b)glucagon
c)cortisol
d)epinephrine
e)somatostatin

ans 1.b
2.d
3.e
please correct me if am wrong

 

[mahima_dentist]

Hi,
I think the answer is 3
coz Ca binds to the troponin(in striated muscles) and calmodulin(in smooth muscles) and cause some kind of conformatory change which causes tropomyosin to move away from the active site of the actin which otherwise in relaxed states of the muscles is covered by tropomyosin..and then once the active site is available on the actin ,myosin's head can bind to that..correct me plz if am wrong
mahima

plz correct me if am wrong.does anyone has a difference of opinion
thanks

 

[NBDE@hotmail]

production of phosphophenolpruvate carboxykinase is stimulated by

insulin,cortisol,aldosterone,somatotropin
-cortisol
which of the following statement best describe the primary role of calcium in activation of cardiac muscle.
1.causes depolarization of the muscle
2.couple myosin and actin to form actinomyosin
3.reduced inhibition of tropomyosin up the myofilaments
4.activate myosin molecules so that they can interact with actin filaments
-4
which of the following represents the principal allosteric regulator of pyruvate metabolism in the liver

1.ATP 2. NAD 3. CITRATE 4.CYCLIC AMP 5. ACETYL COA
-acetyl coA
which of the following statetmants best describes the activity of DNA ligase
1.seals single-stranded nicks in DNA
2.prevents the polymerase from falling off the DNA
-1
need help for this q 🙁 & explanation thank you

re: cyanosis of skin and mucous membrane, it should be inc. level of reduced hb ( mahima is right)

 

[gp120]

1- insulin
2.-activate myosin molecules so that they can interact with actin filaments
3. ACETYL COA
4.seals single-stranded nicks in DNA

i think the answer is cortisol instead of insulin,cortisol favours gluconeogenesis process in which the enzyme phosphophenolpyruvate carboxykinase converts oxaloacetate into phosphophenol pyruvate ,which is a reversal step of glycolysis,hence overall pyruvate is converted to glucose ,whereas insulin favours glycolysis.

if iam wrong pls.... correct me.

 

[gp120]

ans 1.b
2.d
3.e
please correct me if am wrong

the answer for 3 is insulin ,which favours the protein synthesis not protein degradation (catabolism)but the hormone somatostatin inhibits insulin .

please correct me if iam wrong................... 👍

 

[drkum1]

i think the answer is cortisol instead of insulin,cortisol favours gluconeogenesis process in which the enzyme phosphophenolpyruvate carboxykinase converts oxaloacetate into phosphophenol pyruvate ,which is a reversal step of glycolysis,hence overall pyruvate is converted to glucose ,whereas insulin favours glycolysis.

if iam wrong pls.... correct me.

Hey
I think the same too. Cortisol is correct.

 

[dr_siba21]

why cortisol? 😕

 

[dr_siba21]

though cortisol favors gluconeogenesis the ans is insulin as

The gene for phosphoenolpyruvate carboxykinase (PEPCK) is expressed in a tissue-specific manner in the liver, kidney, and adipose tissue and is regulated by hormones including cAMP and insulin.




this time come with confirmation . otherwise i ll **** u bitch.



I CORRECT WRONG DIAGNOSIS

 

[drkum1]

Which of the following agent is not likely to be found in plasma?
A)thrombin
B)fibrinogen
C)prothrombin
D)calcium ion
E)ascorbic acid

 

[navjit]

1) An example of primary active transport is the movement of
a)glucose into muscle
b)potassium into nerves cell
c)protein across capillaries
d)sodium into endothelial cell
e)oxygen across the alveolar wall

2) A dental patient presents with bluish discoloration of the mucous membranes indicative of cyanosis. This condition is most likely the result of
a)increased Pco2
b)a decreased hemoglobin concentration
c)a decreased red blood cell concentration
d)increased levels of reduced hemoglobin
e)decreased blood flow to the affected area

3)Which of the following hormones generally increase the rate of anabolic(biosynthetic reaction?
a)insulin
b)glucagon
c)cortisol
d)epinephrine
e)somatostatin

1)e
2)d
3)a
plz correct me if i am wrong &also explain

 

[mahima_dentist]

Which of the following agent is not likely to be found in plasma?
A)thrombin
B)fibrinogen
C)prothrombin
D)calcium ion
E)ascorbic acid

ans:a