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प्रश्न
Which of the following are purine bases?
(i) Guanine
(ii) Adenine
(iii) Thymine
(iv) Uracil
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उत्तर
(i) Guanine
(ii) Adenine
Explanation:
Purines consist of six-membered and five-membered nitrogen-containing ring fused together.
Guanine and adenine are purine bases whose structures are
Adenine (A)
Guanine (G)
While thymine and uracil are pyrimidine bases.
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संबंधित प्रश्न
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Peptide linkage
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The correct statement for protein haemoglobin.
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Given below are two statements labelled as Assertion (A) and Reason (R).
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Reason (R): The secondary structure of proteins is stabilized by hydrogen bonding.
Select the most appropriate answer from the options given below:
Presence of disulphide link gives rise to which structure of protein?
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An α-helix is a structural feature of ______.
Proteins are polymers of ______.
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Reason (R): A tetrapeptide contains 4 amino acids linked by 4 peptide bonds.
What is the effect of denaturation on the structure of proteins?
Match List I with List II:
| List I | List II |
| A. GLUT-4 | I. Hormone |
| B. Insulin | II. Enzyme |
| C. Trypsin | III. Intercellular ground substance |
| D. Collagen | IV. Enables glucose transport into cells |
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Statement II: Adult human haemoglobin, consists of 4 subunits (two subunits of a type and two subunits β type.)
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