4a) answer is b. Because in Fat 3 molecule of fatty acids joined to one molecule of glycerol by 3 ester bonds
4b) In double helix structure of nucleic acid, Guanine hydrogen bond to (d) Cytosine by 3 hydrogen bond and Thymine bond to Adenine by 2 hydrogen bond.
4c) The alpha helix of protein structure is stabilized by (b) Hydrogen bond.
4d) Nucleotide=(a) phosphate+ five-carbon sugar+nitrogenous base
4e) Saturated fatty acids:-(b)They have a higher ratio of hydrogen to carbon than unsaturated fats.
4f) (c) DNA is always double stranded not single stranded.
4.g) (b)has no beneficial uses in the human body is option is not true for cholesterol. Because cholesterol play many important role in body like Regulate membrane fluidity, hormone synthesis, vitamin D synthesis.
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