Secondary Structure of Proteins

Q. The basic amino acids are:

1. Lysine, Arginine
2. Alanine, Glutamic acid
3. Proline, Valine
4. Alanine, Cysteine

Q. Which of the following is basic amino acid ?

1. Lysine
2. Proline
3. Alanine
4. Aspartic acid

Q. Assertion
All Amino acids exist as Zwitter ions.

Reason
Amino acids have both- $N{H}_2$ and - COOH group.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion aand Reason are incorrect

Q.

The α - amino acids, usually exist in the form of zwitter ions. It means they have:

1. No acidic or basic group

2. Basic group - COO^- and acidic group NH₄⁺

3. Basic group -COO^- and acidic group - NH₃⁺

4. Basic group - COO^- and acidic group - COO^2-

Q. Where does the water present in the egg go after boiling the egg?

Q.

QUESTION 14.14

What type fo bonding helps in stabilising the $\alpha$ - helix structure fo proteins?

Q.

$\alpha -$ helix is a secondary structure of proteins formed by twisting of polypeptide chain into right handed screw like structure. Which type of interactions are responsible for making the $\alpha -$ helix structure stable?

Q. Assertion
Globular proteins are highly branched proteins usually soluble in water.

Reason
Insulin and Albumin are the common fibrous proteins.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion aand Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

α - helix structure of protein is stabilized by

1. Peptide bond

2. Vander Waals forces

3. Hydrogen bond

4. Dipole - dipole interactions

Q.

QUESTION 14.13

What are the common types of secondary structure fo proteins?

Q. Name the structure of protein in which all peptide chains are stretched out to full extension and laid side by side through intermolecular hydrogen bonds.

1. $\alpha$-helix
2. $\beta$-pleated sheet
3. tertiary structure
4. None of the above

Q. Which force is responsible for the stacking of the α-helix structure of protein?

1. H-bond
2. Ionic bond
3. Covalent bond
4. Vander Waals forces

Q. Alanylglycylphenylalanine is an example of a ______

1. dipeptide
2. tripeptide
3. tetrapeptide
4. polypeptide

Q. The predominant form of histamine present in human blood is $(p{K}_a\text{Histidine =6.0}$ )

1. 
2. 
3. 
4. 

Q. Non-essential amino acid among the following is:

1. Proline
2. Histidine
3. Valine
4. Methionine

Q. Out of these statements which is/are true for fibrous proteins?

1. If the polypeptide chain is held together by disulphide bridges and combine to form fibre like structure, then it is called fibrous protein.
2. Examples for fibrous proteins are keratin, elastin, myosin, etc, .
3. Fibrous proteins have a coil like structure.
4. Fibrous proteins are insoluble in water.

Q. Which of the following is incorrect for amino acids?

1. Non-essential amino acids are synthesized in the body
2. Most naturally occuring amino acids have D-configuration
3. Glycine is the only optically inactive among naturally occuring $\alpha$ amino acids
4. Amino acids show amphoteric behaviour in zwitter ionic form

Q. Most common types of secondary structures of proteins are?

1. $\alpha -$ helix and $\beta -$ helix structures
2. $\alpha -$ helix and $\beta -$ pleated structures
3. right and left hand twisted structures
4. globular and fibrous structures

Q.

α - helix structure of protein is stabilized by

1. Peptide bond

2. Vander Waals forces

3. Hydrogen bond

4. Dipole - dipole interactions

Q. The secondary structure of a protein refers to?

1. Sequence of $\alpha$-amino acids
2. $\alpha$-helical backbone
3. Hydrophobic interactions
4. Fixed configuration of the polypeptide backbone

Q. What is the Bond Order of SO2 and How many resonating structures are there for SO2?

Q. Which of the following is a basic amino acid?

1. Serine
2. Lysine
3. Alanine
4. Tyrosine

Q. Out of the following, which type of interaction is responsible for the stabilisation of $\alpha$-helix structure of proteins?

(JEE MAIN 2021)

1. Covalent bonding
2. vander Waals forces
3. Hydrogen bonding
4. Ionic bonding

Q.

Describe the secondary structure of proteins.

Q.

α - helix structure of protein is stabilized by

1. Peptide bond

2. Vander Waals forces

3. Hydrogen bond

4. Dipole - dipole interactions

Q. Write the two types of secondary structures of proteins.

Q. Proteins are found to have two different types of secondary structures: $\alpha$ helix and $\beta$ pleated sheet. $\alpha$ helix structure of protein is stabilised by :

1. peptide bonds
2. van der Waals forces
3. hydrogen bonds
4. none of these

Q. Which of the following is the example of structural protein?

1. Myosin
2. Collagen
3. Keratin
4. All of these

Q. Out of these statements which is/are true for fibrous proteins?

1. If the polypeptide chain is held together by disulphide bridges and combine to form fibre like structure, then it is called fibrous protein.
2. Examples for fibrous proteins are keratin, elastin, myosin, etc, .
3. Fibrous proteins have a coil like structure.
4. Fibrous proteins are insoluble in water.

Q. Which of the following is the example of structural protein?

1. Myosin
2. Collagen
3. Keratin
4. All of these