Secondary Structure of Protein

Q. Arrange the following events in the order of synthesis of a protein
i) A peptide bond forms
ii) A tRNA matches its anticodon to the codon in the A- site
iii) The movement of second tRNA complex from A-site to P-site
iv) The large subunit attaches to the small subunit and the initiator tRNA fits in the P-site
v) A small subunit binds to the mRNA
vi) The activated amino acid tRNA complex attaches the initiation codon on mRNA

1. v, vi, iv, ii, i, iii
2. iv, v, iii, ii, i, vi
3. iv, vi, v, ii, I, iii
4. v, iv, iii, ii, vi, i

Q. Which level of protein organisation is exemplified by $\alpha$-helices and $\beta$-sheets?

1. Primary structure
2. Quaternary structure
3. Secondary structure
4. Tertiary structure

Q. Which level of protein organisation is exemplified by $\alpha$-helices and $\beta$-sheets?

1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure

Q. The different amino acids are joined together by peptide bonds to form

1. Lipids
2. Proteins
3. Carbohydrates
4. Nucleic acids

Q.

What stabilizes the secondary structure of proteins?

1. Number of purine pairs and pyrimidine pairs is equal only in similar forms of DNA but varies from A form to B form

2. Number of purines and pyrimidines is equal but may vary

3. The number of purines and pyrimidines depends on the pitch of the DNA

4. Number of purines and pyrimidines is equal universally in DNA

Q.

What stabilizes the secondary structure of proteins?

1. Disulphide bridges

2. Hydrogen bonds

3. Vanderwaals forces

4. Ionic interactions

Q. The alpha helix and beta sheet are found at which level of protein organisation?

1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quatenary structure

Q. What would happen if in a gene encoding a polypeptide of 50 amino acids, 25${}^{th}$ codon (UAU) is mutated to UAA?

1. A polypeptide of 49 amino acids will be formed.
2. Two polypeptides of 24 and 25 amino acids will be formed.
3. A polypeptide of 24 amino acids will be formed.
4. A polypeptide of 25 amino acids will be formed.

Q. Which level of protein organisation is exemplified by $\alpha$-helices and $\beta$-sheets?

1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure

Q. Which level of protein organisation is exemplified by $\alpha$-helices and $\beta$-sheets?

1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure

Q. Differences between alpha helix and beta pleated sheet structures of proteins?

Q. Which of the classes of RNA molecules carries the amino acids that are added to the growing polypeptide chain?

1. Ribosomal RNA
2. Transfer RNA
3. Messenger RNA
4. Primary mRNA transcript

Q. Initiation of polypeptide chain in protein synthesis is induced by

1. Leucine
2. Lysine
3. Glycine
4. Methionine

Q. In E.coli, the chain initiating amino acid in protein synthesis is

1. Methionine
2. N-formyl methionine
3. Glycine
4. Serine

Q. Write a note on conjugated protein.

Q. Which level of protein organisation is exemplified by $\alpha$-helices and $\beta$-sheets?

1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure

Q.

What stabilizes the secondary structure of proteins?

1. Disulphide bridges

2. Hydrogen bonds

3. Vanderwaals forces

4. Ionic interactions

Q. Which level of protein organisation is exemplified by $\alpha$-helices and $\beta$-sheets?

1. Primary structure
2. Quaternary structure
3. Secondary structure
4. Tertiary structure