Quaternary Structure of Protein

Q.

What is G₀ (quiescent phase) of cell cycle?

Q.

Is Haemoglobin a Tertiary or quaternary structure?

Q. An example for protein with quaternary structure is:

1. Myoglobin
2. Haemoglobin
3. Keratin
4. All of these

Q. Some proteins are an assembly of more than one polypeptide or subunits. The manner in which these individual folded polypeptides or subunits are arranged with respect to each other in the architecture of the protein is also known as

1. primary structure
2. secondary structure
3. tertiary structure
4. quaternary structure

Q. How many polypeptide chains are there in 1 Hb molecule?

1. 2 alpha & 2 beta
2. 4 alpha
3. 4 beta
4. 1 alpha & 3 beta

Q. What are proteins ? How does peptide bond is formed explain ? Draw structure of glycine .

Q. When we say proteins have primary, secondary, tertiary and quaternary structures, are we referring to the protein? i.e does a single protein show all these structures?
Or is it that some proteins exhibit primary structures while somesecondary….and so on?

Q. Choose the correct option with respect to the quaternary structure.

1. It is the linear chain of amino acids joined together by peptide bonds.
2. It is the folding of the polypeptide chain due to interactions among amino acids.
3. It is the 3D structure formed due to the protein folding upon itself.
4. It is the association of 2 or more polypeptide chains.

Q. The primary structure of a protein molecule has

1. Three ends
2. Two ends
3. One end
4. No ends

Q. Choose the correct option with respect to the quaternary structure.

1. It is the linear chain of amino acids joined together by peptide bonds.
2. It is the folding of the polypeptide chain due to interactions among amino acids.
3. It is the association of 2 or more polypeptide chains.
4. It is the 3D structure formed due to the protein folding upon itself.

Q. Match the following:

$\begin{array}{cc}\text{Column~I}& \text{Column~II}\\ \text{(i) Haemoglobin}& \text{(1) Fibrous protein}\\ \text{(}ii)Keratin& \text{(2) Non-essential}\\ \text{(iii)Glycine}& \text{(3)}\alpha \text{2}\beta \text{2}\\ \text{(iv)Valine}& \text{(4) Essential}\end{array}$

1. i-3, ii-1, iii-2, iv-4
2. i-2, ii-3, iii-4, iv-1
3. i-1, ii-2, iii-3, iv-4
4. i-3, ii-1, iii-4, iv-2

Q. Human haemoglobin (Hb) has

1. primary structure
2. secondary structure
3. tertiary structure
4. quaternary structure

Q. An example for protein with quaternary structure is:

1. Myoglobin
2. Haemoglobin
3. Keratin
4. All of these

Q. Abrin and ricin are secondary metabolites of some plants. These secondary metabolites are

1. Carbohydrate in nature
2. Lipid in nature
3. Glycolipid in nature
4. Proteins in nature

Q. Human haemoglobin (Hb) has

1. primary structure
2. secondary structure
3. tertiary structure
4. quaternary structure

Q. Identify X and Y in the given sequence.

1. N-terminal amino acid C-terminal amino acid
2. N-terminal amino acid N-terminal amino acid
3. C-terminal amino acid N-terminal amino acid
4. C-terminal amino acid C-terminal-amino acid

Q.

A homopolymer has only one type of building block called monomer repeated 'n' number of times. A heteropolymer has more than one type of monomer. Proteins are heteropolymers usually made of

(a) 20 types of monomers (b) 40 types of monomers

(c) 30 types of monomers (d) only one type of monomer

Q. Match the following:

$\begin{array}{cc}\text{Column~I}& \text{Column~II}\\ \text{(i) Haemoglobin}& \text{(1) Fibrous protein}\\ \text{(}ii)Keratin& \text{(2) Non-essential}\\ \text{(iii)Glycine}& \text{(3)}\alpha \text{2}\beta \text{2}\\ \text{(iv)Valine}& \text{(4) Essential}\end{array}$

1. i-3, ii-1, iii-4, iv-2
2. i-1, ii-2, iii-3, iv-4
3. i-3, ii-1, iii-2, iv-4
4. i-2, ii-3, iii-4, iv-1

Q.

adult haemoglobin has

1 primary structure of protein

2 secondary structure of protein

3 tertiary structure of protein

4 quaternary structure of protein

Q. The primary oxygen carrier or respiratory pigment in blood of frog and other vertebrates is

1. Myoglobin
2. Haemoglobin
3. Haemocyanin
4. Cytochorome

Q. Match the following:

$\begin{array}{cc}\text{Column~I}& \text{Column~II}\\ \text{(i) Haemoglobin}& \text{(1) Fibrous protein}\\ \text{(}ii)Keratin& \text{(2) Non-essential}\\ \text{(iii)Glycine}& \text{(3)}\alpha \text{2}\beta \text{2}\\ \text{(iv)Valine}& \text{(4) Essential}\end{array}$

1. i-3, ii-1, iii-2, iv-4
2. i-2, ii-3, iii-4, iv-1
3. i-1, ii-2, iii-3, iv-4
4. i-3, ii-1, iii-4, iv-2

Q.

1. ionic bonds
2. hydrogen bonds
3. disulphide $(S-S)$ linkages
4. peptide bonds

Q. Prostaglandins are
I. Fatty in nature
II. Proteinaceous in nature
III. Steroidal in nature
IV. Glycoproteinaceous in nature
Choose the correct option

1. $I$ and $III$
2. Only $I$
3. $II$ and$IV$
4. Only IV

Q. The union of several polypeptide chains to form a complete protein is regarded at what level of protein structure?

Q. Some proteins are an assembly of more than one polypeptide or subunits. The manner in which these individual folded polypeptides or subunits are arranged with respect to each other in the architecture of the protein is also known as

1. primary structure
2. secondary structure
3. tertiary structure
4. quaternary structure

Q. Choose the correct option with respect to the quaternary structure.

1. It is the linear chain of amino acids joined together by peptide bonds.
2. It is the folding of the polypeptide chain due to interactions among amino acids.
3. It is the 3D structure formed due to the protein folding upon itself.
4. It is the association of 2 or more polypeptide chains.

Q.
The structure formed by the sequence of amino acids in a polypeptide chain is called

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

Q. Inulin is a polymer of

1. Galactose
2. Glucose
3. Fructose
4. Arabinose

Q. Quarternary structure of protein _____________________.

1. Consists of four subunits
2. May be either $\alpha$ or $\beta$
3. Is unrelated to two function of the protein
4. Is dictated by the primary structures of the individual subunits

Q. Differentiate between
Primary and secondary structure of proteins