Practice free Biomolecules (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following vitamins is synthesized by the bacteria of the gut?
The text states, 'However, the bacteria of the gut can produce some of the vitamins required by us.'
The precursor term 'Vitamine' was eventually shortened to 'Vitamin' because:
The NCERT text clarifies, 'Later work showed that most of them did not contain amino groups, so the letter ‘e’ was dropped and the term vitamin is used these days.'
A person suffering from bleeding gums and slow wound healing would likely be deficient in which vitamin?
Scurvy, characterized by bleeding gums, is listed as a deficiency disease of Vitamin C (Ascorbic acid) in Table 10.3. Vitamin C is crucial for collagen formation and wound healing.
Which of the following is a fat-soluble vitamin found in green leafy vegetables and plays a role in blood clotting?
Table 10.3 states that Vitamin K's source includes green leafy vegetables and its deficiency leads to 'Increased blood clotting time', confirming its role in blood clotting. The classification section also lists Vitamin K as fat-soluble.
Given below are two statements:
Statement I: A unit formed by the attachment of a base to 1'-position of sugar is known as nucleoside.
Statement II: When nucleoside is linked to phosphorus acid at 5'-position of sugar moiety, we get nucleotide.
Choose the correct answer:
Standard definitions of nucleoside (base + sugar) and nucleotide (nucleoside + phosphate at 5′).
Some tranquilizers are listed below. Which one from the following belongs to barbiturates?
Veronal (barbital) is a barbituric-acid derivative.
The reagents with which glucose does not react to give the corresponding tests/products are:
A. Tollen's reagent B. Schiff's reagent C. HCN D. NH₂OH E. NaHSO₃
Choose the correct options from the given below:
Glucose exists largely in cyclic hemiacetal form, so its aldehyde group is masked — it does not give a positive Schiff's test or react with NaHSO₃.
Match List I with List II:
List I (Name of Vitamin) — A. Vitamin B₁₂, B. Vitamin D, C. Vitamin B₂, D. Vitamin B₆
List II (Deficiency disease) — I. Cheilosis, II. Convulsions, III. Rickets, IV. Pernicious anaemia
Choose the correct answer:
B₁₂ → Pernicious anaemia (IV); D → Rickets (III); B₂ → Cheilosis (I); B₆ → Convulsions (II).
Sugar 'X': A. is found in honey. B. is a keto sugar. C. exists in α and β anomeric forms. D. is laevorotatory. 'X' is:
A keto sugar found in honey, existing in α/β anomers and laevorotatory is D-Fructose.
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