CBSE 2023 · Region 5 · Set 1 · Q29 · 3 marks
Give reasons for any $\displaystyle 3$ of the following observations :(a)Penta-acetate of glucose does not react with hydroxylamine.(b)Amino acids behave like salts.(c)Water soluble vitamins must be taken regularly in diet.(d)The two strands in DNA are complimentary to each other.
Give reasons for any $\displaystyle 3$ of the following observations :
(a)
Penta-acetate of glucose does not react with hydroxylamine.
(b)
Amino acids behave like salts.
(c)
Water soluble vitamins must be taken regularly in diet.
(d)
The two strands in DNA are complimentary to each other.
Marking-scheme solution
(a) Absence of free - CHO group.
(b) Due to the presence of both acidic (-COOH) and basic \(\displaystyle \left(-\mathrm{NH}_{2}\right)\) groups in the same molecule / formation of Zwitter ion.
(c) They are excreted in urine / cannot be stored in body.
(d) Because the H-bonds are formed between specific pairs of bases / pairing between A & T and between C & G.
BiomoleculesCarbohydratesUnderstandshort_answermedium
More from Biomolecules
- The specific sequence in which amino acids are arranged in a protein is called its2024 · asked 4×
- Assertion: Glucose gets oxidized to six carbon gluconic acid on reaction with bromine water. Reason (R): The…2026 · asked 3×
- Living systems are made up of various complex biomolecules like carbohydrates, proteins, nucleic acids,…2023 · asked 3×
- Carbohydrates are optically active polyhydroxy aldehydes and ketones. They are also called saccharides. All…2023 · asked 3×
- Identify the polysaccharide among the following:2026 · asked 3×
- Which of the following structures represents α -D-glucose?2023 · asked 3×
- Certain organic compounds are required in small amounts in our diet but their deficiency causes specific…2024 · asked 3×
- Carbohydrates are polyhydroxy aldehydes or ketones that represent enormous structural diversity in terms of…2025 · asked 3×
CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.