PATHOLOGY

Detailed explanation-1: -A DNA molecule is made up of two linked strands that wind around each other to resemble a twisted ladder in a helix-like shape.

Detailed explanation-2: -The double-helix shape allows for DNA replication and protein synthesis to occur. In these processes, the twisted DNA unwinds and opens to allow a copy of the DNA to be made. In DNA replication, the double helix unwinds and each separated strand is used to synthesize a new strand.

Detailed explanation-3: -A molecule of DNA has two strands, composed of nucleotides, that form a double helix shape.

Detailed explanation-4: -A double helix resembles a twisted ladder. Each ‘upright’ pole of the ladder is formed from a backbone of alternating sugar and phosphate groups. Each DNA base? (adenine, cytosine, guanine, thymine) is attached to the backbone and these bases form the rungs.