Question 4 SPM Paper 2 2010

The suggested answer for this Question might help you ..Nur..Please refer to Paper2 SPM2010

4(a)	X-primary structure Y-Secondary structure
(b)	The linear sequence of amino acids in the polypeptide chain./ Jujukan linear asid amino dalam rantai polipeptida.
(c)	Protein X is broken down by an enzyme/ polypeptidase in a process of hydrolysis to form dipeptide. Protein X dihidrolisiskan oleh enzim /polipeptidase membentuk dipeptida.
(d)	Because it contains all 8 essential amino acids needed by humans. Sebab ia mengandungi 8 asid amino perlu yang diperlukan oleh manusia.
(e)(i)	Silk is a protein fiber. High temperature will reduce the strength of hydrogen bonds, so this will distrupt the structure , thus denature proteins. Sutera adalah fiber protein. Suhu yang tinggi akan mengurangkan kekuatan ikatan hydrogen, ini akan mengganggu struktur protein lalu menyebabkan denaturasi.
(ii)	Wash it in a cold water./ Basuh dalam air sejuk Do not wring.. Do not expose to direct sunlight./ elak dedah terus kepada cahaya matahari Never use chlorine bleach on silk. / jangan menggunakan bahan peluntur klorin