H bonding is not present in which of the following _
Correct answer: D. Lipids
- A. DNA
- B. Proteins
- C. Carbohydrates
- D. Lipids
Explanation
In DNA, hydrogen bonding occurs between complementary base pairs (adenine-thymine and guanine-cytosine), holding the two strands of the double helix together.In proteins, hydrogen bonds play an important role in the folding of the protein chain into its three-dimensional structure. Hydrogen bonding between amino acid side chains and the peptide backbone stabilizes the protein's structure.In carbohydrates, hydrogen bonding is responsible for the cohesive properties of sugars and their ability to form complex structures, such as in cellulose and starch.Lipids generally do not contain hydrogen bonds within their own structure, as they are composed mostly of nonpolar hydrocarbon chains and polar functional groups that are not easily ionized or polarized. However, lipids can participate in hydrogen bonding with other molecules or with water through their polar functional groups, such as the hydroxyl (-OH) group in glycerol or the carbonyl (-C=O) group in fatty acids.
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About Hydrogen Bonding
Hydrogen bonding is the strong attraction between hydrogen attached to nitrogen, oxygen or fluorine and an electronegative atom in the same or another molecule. It explains unusual boiling points, viscosity, surface tension, water's properties and the difference between intermolecular and intramolecular hydrogen bonding.
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