DNA is made of two chains that twist about one another in the shape of a _______.a)Broken ladderb)Straight ladderc)Straight spirald)Double helixCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

They are twist in a right handed double helical way therefore it's called double helix DNA which was given by Watson and crick
'hope it'll help'

Answer

Double helix

Answer

Two strands of DNA is coiled like a helical structure so it is called double helix

Answer

The double helix describes the appearance of double-stranded DNA, which is composed of two linear strands that run opposite to each other, or anti-parallel, and twist together. Each DNA strand within the double helix is a long, linear molecule made of smaller units called nucleotides that form a chain.

Answer

The Structure of DNA

DNA, or deoxyribonucleic acid, is a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms. It is composed of two chains of nucleotides that twist about one another, forming a double helix structure.

The Double Helix Structure

The structure of DNA is often compared to a twisted ladder or spiral staircase. This double helix structure was first proposed by James Watson and Francis Crick in 1953, based on the work of Rosalind Franklin, Maurice Wilkins, and others.

The double helix consists of two long chains, or strands, of nucleotides that are held together by hydrogen bonds. These two strands are twisted around each other in a right-handed manner, forming a helical shape. The two strands are complementary, meaning that the sequence of nucleotides in one strand determines the sequence in the other strand.

The Complementary Base Pairing

The two strands of DNA are made up of nucleotides, which are the building blocks of DNA. Each nucleotide consists of three components: a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base. The four nitrogenous bases found in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).

The nucleotides in one DNA strand form bonds with nucleotides in the other DNA strand through a process called base pairing. Adenine pairs with thymine, and cytosine pairs with guanine. These base pairs are held together by hydrogen bonds, which are relatively weak bonds that can be easily broken and reformed.

The Importance of the Double Helix Structure

The double helix structure of DNA is essential for its function. It allows DNA to be replicated accurately during cell division, as the two strands can separate and serve as templates for the synthesis of new DNA strands. It also allows DNA to carry and transmit genetic information by encoding the sequence of nucleotides in the DNA molecule.

Furthermore, the double helix structure provides stability to the DNA molecule. The twisting of the two strands around each other helps to protect the genetic information stored in DNA from damage and degradation.

Overall, the double helix structure of DNA is a fundamental aspect of its function and plays a crucial role in the transmission and expression of genetic information.

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