Question

In a cell, DNA is found in
A. Nucleus, mitochondria, and plastid
B. Nucleus, mitochondria, and Golgi
C. Nucleus, Golgi, and plastid
D. None of the above

Answer 1

DNA is Deoxyribonucleic acid which is composed of two polynucleotide chains that are coiled around each other to form a double helix structure carrying genetic instructions for the development, growth, reproduction, and functioning of all known organisms. DNA and RNA both are nucleic acids present in an organism.

Step by step answer: DNA is composed of nucleic acids which are one of the four major types of macromolecules that are very essential for life along with proteins, complex carbohydrates, and lipids. -The two DNA strands are known as polynucleotides that are formed of simpler monomeric units which are known as nucleotides. Each of the nucleotides are composed of guanine, cytosine, adenine or thymine, a phosphate group and sugar which is called deoxyribose.
-The nucleotides are joined with one another by a chain of covalent bonds between one nucleotide and phosphate of the next which results in the formation of the sugar-phosphate backbone.
-Both the strands of DNA store the same biological information whose large part is non-coding which means that they do not serve as a pattern for protein sequence. Mitochondria, Plastid and Nucleus contain -DNA as they contain genetic material for the functioning. DNA plays a major role in the genetics of an organism and helps in evolution.
Hence, the correct option is A. Nucleus, Mitochondria, and Plastid.

Note: The proteins in these three organelles which are mitochondria, plastid and nucleus are encoded by nuclear DNA which is synthesized in the cytosol, and then imported into the individual organelle. DNA contains all the genetic information and is an essential part of an organism.