Take Test: Quiz3-Due b Protein structure (from primary to quaternary) involves a
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Take Test: Quiz3-Due b Protein structure (from primary to quaternary) involves all of the following properties except covalent bond. van der Waals interactions. O hydrogen bonding. Oionic interactions. Onone of the above. They are all involved. QUESTION 2 Leucine and valine have side chains that do not interact with water; therefore, they O are hydrophilic. are nonpolar. have hydroxyl groups in their side chains. O are electrically charged. form only left-handed isomers. QUESTION 3 Quaternary structure of proteins refers to the arrangement of the protein's atoms in three-dimensional space. 0 whether the polypeptide chain is an a helix or pleated sheet. the number and kind of polypeptide subunits the protein has. the amino acid sequence of the protein. O the lipids or carbohydrates that are attached to the proteins. QUESTION 4 Which of the following functional group is nonpolar? phosphate hydroxyl carboxyl all of the above Click Save and Submit to save and submit. Click Save All Answers to save all answers.Explanation / Answer
1) ans - b) VAN DER VAAL'S FORCE .
this force helps in interaction of proteins with other molecules.
2)ans - b) non polar
they have side chains of pure hydrocarbon alkyl groups or aromatic groups , which are water repellent i.e. hydrophobic.
3) ans - c)the number and kind of polypeptide subunits the protein has .
quartenary structure of protein is the number and arrangement of many folded protein subunits. eg. haemoglobin , one subunit binds to carbondioxide whereas the other binds to the oxygen , thus serving two functions.
4)ans ---*phosphate group has p-o , single bonds here are polarized .
* hydroxyl group has h-o , thus it is polar.
* carboxyl group has c=o, thus that too is polar.
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