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(A) Tertiary structure of proteins repre...

(A) Tertiary structure of proteins represents overall folding i.e. further folding folding of `2^(@)` structure.
(R) `2^@` & `3^@` structures of protein stabilized by hydrogen bonds disulphide linkages, vander waals & electrostatic force of attraction.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
B
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Explore conceptually related problems

The forces that stabilize the 2^(@) and 3^(@) structure of protien are:

(A) A protein chain tends to fold in a repeating geometric structure (R) A protein chain with more number of hydrogen bonds is having less energy.

(A) The folding of polypeptide chains leads to globular proteins. (R) Globular structure is a part of secondary structure of protein.

Regarding secondary structure of a protein, correct statement(s) is/are (A) peptide bonds possess regional planarity (B) C = O and -NH- of different peptide chains are held by Van der Waal attarctions (C ) closely packed arrangement so as to minimise repulsion between ''R'' groups.

Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Stability of saturated alkyl carbocations can be explained by

Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Which of the following carbocations will show highest number of Hyperconjugation forms?

Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Hyperconjugation is possible in which of the following species ?

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) Proteins are step growth polymers of alpha- amino acids. (R) alph...

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  2. (A) The proteins are synthesised by various RNA molecules in the cell....

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  3. (A) Tertiary structure of proteins represents overall folding i.e. fur...

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  4. (A) Valine and Leucine are essential amino acids. (R) Both valine an...

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  5. (A) Leucine and isoleucine are structural isomers. (R) Isoleucine ha...

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  6. (A) Xerophthalmia is treated with vitamin - B6 (R) Xerophthalmia is...

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  7. (A) Insulin contains two peptide chains. (R) Insulin is an example o...

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  8. (A) Vitamin 'C' is ascorbic acid. (R) All acids are vitamins

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  9. (A) All hormone receptors are proteins, (R) All hormones are protein...

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  10. (A) Water soluble vitamins like ascorbic acid must be supplied regular...

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  11. (A) Vitamins are important in diet. (R) Deficiency of vitamins cause...

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  12. (A) Insulin is a steroidal harmone. (R) A steroid contains two five ...

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  13. (A) Vitamins are considered as essential food factors. (R) Most of th...

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  14. (A) Vitamins are to be supplimented to the body as an energy source. ...

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  15. (A) Deficiency of vitamin K causes excessive bleeding in injuries. (...

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  16. (A) Enzyme catalysed hydrolysis of sucrose is faster than acid catalys...

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  17. (A) Insulin is a globular protein. (R) Insulin has two polypeptide c...

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  18. (A) Low level of thyroxine leads to hypo- thyroidism. (R) Thyroxine ...

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  19. (A) Carbohydrate metabolism is controlled by gluco corticoids. (R) H...

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  20. (A) Enzymes are needed in large quantities for the progress of a react...

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