CELL STRUCTURES AND FUNCTION
BIO MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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RNA
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Insulin
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Fats
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Sucrose
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Detailed explanation-1: -Insulin is a small globular protein containing two chains, A (21 residues) and B (30 residues) (Fig. 2.1A). Stored in the cell as a Zn2+-stabilized hexamer, the hormone dissociates in the bloodstream to function as a Zn2+-free monomer (Fig. 2.1B).
Detailed explanation-2: -Insulin is a protein chain or peptide hormone.
Detailed explanation-3: -Human insulin is a 51-amino acid nonglycosylated peptide hormone that consists of two polypeptide chains, namely chains A and B. Insulin is synthesized in the beta cells of the pancreas, however, the initial form of insulin is a precursor molecule called preproinsulin that consists of 86 amino acids.
Detailed explanation-4: -Insulin is a tiny protein. It moves quickly through the blood and is easily captured by receptors on cell surfaces, delivering its message. Small proteins pose a challenge to cells: it is difficult to make a small protein that will fold into a stable structure.