Biomolecules · JEE Advanced previous year questions

2025 1 question

1. Q482025 · 18 May 2025 · Paper 2· Numerical answer

   A linear octasaccharide ($\text{molar mass}=1024{\text{ g mol}}^{-1}$) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is $58.26\%$ (w/w) of the total amount of the monosaccharides produced in the hydrolyzed products. The number of ribose unit(s) present in one molecule of octasaccharide is _________. $\text{Use:}$ Molar mass (in ${\text{g mol}}^{-1}$): ribose $=150$, 2-deoxyribose $=134$, glucose $=180$; Atomic mass (in $\text{amu}$): $\mathrm{H}=1$, $\mathrm{O}=16$

   Show answer

   Answer: 2