Bissoy.com
Doctors Medicines MCQs Q&A

The primary structure of a protein is held together by non-covalent interactions such as peptide bonds, made during transcription.

The primary structure of a protein is held together by non-covalent interactions such as peptide bonds, made during transcription. Correct Answer False

Both covalent and non-covalent interactions exist in a protein molecule. In the primary structure of protein only covalent bonds are present, such as peptide bonds. Hence, the above statement is false. The correct statement is – “The primary structure of a protein is held together by covalent interactions such as peptide bonds, made during translation.”

Related Questions

The peptide group in a protein has a rigid, planar structure. Which interactions give the peptide bond its partial double bond character?
Phytase, an enzyme produced by Aspergillus niger can be adsorbed on microcrystalline cellulose powder (MCCP). The adsorption follows a Langmuir isotherm and the maximum concentration of the protein that can be obtained on the adsorbent is 70 mg cm-1. At a concentration of 50 mg L-1 of protein in the solution, the concentration of protein on the adsorbent reaches 35 mg cm-1. It is desired to recover 90% of the protein from 1.5 liter of the cell free culture filtrate containing 220 mg L-1 protein by addition of MCCP to the solution. The concentration of the protein adsorbed on the solid at equilibrium will be:
A coiled peptide chain held in place by hydrogen bonding between peptide bonds in the same chain is?
Protein’s solubility depends on the relative balance between protein-solvent and protein-protein interactions.
Which is the correct order of activities showcased by exogenous pathway? i) Generation of MHC class II molecules ii) MHC-peptide transport iii) Class II MHC peptide loading iv) Generation of Peptide from proteolysis
Analysis of a hexapeptide using enzymatic cleavage reveals the following result:
• Amino acid composition of the peptide is: 2R, A, V, S, Y
• Trypsin digestion yields two fragments and the compositions are: (R, A, V) and (R, S, Y)
• Chymotrypsin digestion yields two fragments and the compositions are: (A, R, V, Y) and (R, S)
• Digestion with carboxypeptidase A yields no cleavage product.
Given: Trypsin cleaves at carboxyl side of R. Chymotrypsin cleaves at carboxyl side of Y. Carboxypeptidase A cleaves at amino side of the C-terminal amino acid (except R and K) of the peptide.
The correct amino acid sequence of the peptide is:
The percentage SIMILARITIES and IDENTITIES, respectively, between the two peptide sequences given below will be . . . . . . . . % and . . . . . . . . %.
Peptide I: Ala-Ala-Arg-Arg-Gln-Trp-Leu-Thr-Phe-Thr-Lys-Ile-Met-Ser-Glu
Peptide II: Ala-Ala-Arg-Glu-Gln-Tyr-Ile-Ser-Phe-Thr-Lys-Ile-Met-Arg-Asp
The given bar graph represents data of the production of paper (in ten lakh tonnes) by three different companies X, Y and Z during the years 2008 to 2012. The x-axis shows the 'years' and the y-axis represents the 'production of paper (ten lakh tonnes)'. (Note: The data shown is only for mathematical exercise. They do not represent actual figures.)  The total production of Company Y during 2008 and 2009 and Company X for 2011 and 2012 taken together is p% (p is correct to the nearest integer) more than the total production of Company Z during 2010, 2011 and 2012. The total production of Company Z during 2008 and 2009 taken together is q% (q is correct to the nearest integer) less than the total production of Company X during 2008, 2009 and 2012 and Company Y during 2010 and 2011 all together.  What is the positive difference between p and q ? 
Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statements : About 50 per cent of the animal by-products - hair, skin, horns etc. is edible protein. American chemists have developed a method of isolating 45 per cent of this protein. They used an enzyme developed in Japan to break down soya protein.

Conclusions :
I. Americans have not been able to develop enzymes.
II. Animal by-products protein has the same composition as soya protein.
The quaternary structure of a protein is held together by interactions between the side chain groups.