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Regarding secondary structure of a prote...

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.

A

Only C

B

Only B

C

A and B only

D

A and C only

Text Solution

Verified by Experts

The correct Answer is:
D
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According to molecular orbital theory, atomic orbitals of nearly same energy of different atoms are combined and form molecule. In homodiatomic molecule two atomic orbitals which have wave function psi_(A) and psi_(B) are combined in two ways (psi_(A)pm psi_(B)) . They have two type of electron density, one is bonding [(psi_(A) pm psi_(B))^(2)] where e- density increase between nucleus. Another is antibonding [(psi_(A)pm psi_(B))^(2)] where e^(-) density decreases between nucleus. These molecular orbitals are filled according to Hund, Pauli, afbau principle. Existence of molecule depends on bond order. where bond order = ("Number of bonding "e^(-)"s- number of antibonding "e^(-)s)/(2) lf the molecule have unpaired electron it is paramagnetic otherwise diamagnetic Statement- 1: Removal of two e^(-) from N^(2) , magnetic behaviour does not change while addition of two electrons in O_(2) magnetic behaviour changes. Which of the following correct trends of bond energy is possible to explain by following statement. "Successive filling of antibonding orbital reduce the bond energy between two atoms"? (I ) N_(2) gtgt O_(2) gtgtF_(2) (II) O_(2)^(+) gt O_(2) gt O_(2)^(-) (III) C_(2)^(2) gt C_(2) (IV) CI_(2) gt Br_(2) gt F_(2)

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-2 (AMINO ACIDS AND PROTEINS)
  1. D-Alanine differs from L - Alanine with respect to

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  2. Which of the following does not exit as a zwitter ion ?

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  3. Nature of aqueous solutions of two different amino acids X and Y are a...

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  4. Which one of the following Fischer projection formula represents R - a...

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  5. More number of peptide bonds are present in

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  6. Which one of the following statements is incorrect regarding stereoche...

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  7. What are the common types of secondary structure of proteins ?

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  8. Protein with special three dimensional structure and biological activi...

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  9. How many tripeptides can be prepared by linking the amino acids glycin...

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  10. Which compound can exist in a dipolar (zwitter ion) structure ?

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  11. which of the following is not a function of proteins?

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  12. The amino acids which cannot be synthsised in the body but must be sup...

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  13. Mark the wrong statement about enzymes

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  14. Number of peptide linkages in the artificial sweetner ''aspartame'' is

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  15. Which one of the following is not affected by the denaturation of prot...

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  16. Among the following, achiral amino acid is'

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  17. If the amino group of Glycine and carboxylic acid group of Alanine und...

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  18. Regarding secondary structure of a protein, correct statement(s) is/ar...

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  19. The secondary structure of a protein refers to

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  20. Identify the correct statement

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