Question

$\alpha $helix is found in
A. DNA
B. RNA
C. Lipid
D. Carbohydrates

Answer 1

Hint: In order to solve the given question, we should know that only DNA and RNA has helix in their structure. Lipids and Carbohydrates do not have helix in their structure.

Complete Step by Step Solution:
DNA: DNA nucleotides link up to form units referred to as base pairs, A with T and C with G. A sugar and phosphate molecule is also joined to each base. A nucleotide is made up of a base, a sugar, and a phosphate. The double helix is a spiral formed by two long strands of nucleotides. The base pairs serve as the ladder's rungs while the sugar and phosphate molecules serve as the ladder's vertical side rails in the double helix shape.

RNA: Most living things, including viruses, contain the chemical ribonucleic acid (RNA). Nucleotides, which are ribose sugars joined to nitrogenous bases and phosphate groups, are the building blocks of DNA. Adenine, guanine, uracil, and cytosine are some examples of nitrogenous bases. The majority of RNA is single-stranded, although some unique RNA viruses are double-stranded. It contains $\alpha$ helix structure.

Lipid: A lipid is a polymer composed of three fatty acid molecules and one glycerol molecule. They are the primary components of both animal and plant-based body fat in humans and other species. Polysaccharides start as monomers made of glucose molecules. The monomer of a polypeptide chain or a protein is an amino acid. The many types of proteins are made up of 20 amino acids. The monomers of nucleic acids, such as DNA and RNA, are called nucleotides.

Carbohydrates: A class of chemical substances known as carbohydrates can be found in foods and living tissues as starch, cellulose, and sugars. Carbohydrates contain oxygen and hydrogen in a 2:1 ratio, just like water. Usually, it decomposes within the body of the animal to release energy.
So, the correct option is B. RNA

Note: The thing to remember here is the different structure of the biomolecules. DNA has a double helix structure while the RNA has an $\alpha $helix structure.