Related Experiment Video
Updated: Jul 12, 2026

16:24
Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
Summary
Cyclic deoxyribonucleic acids were found in adenovirus types 2, 7, and 12. Adenovirus type 2 DNA strands averaged 2.5 microns, indicating a molecular weight of 5 million.
Area of Science:
- Virology
- Molecular Biology
- Microscopy
Background:
- Adenoviruses are common viruses that can cause various illnesses.
- Understanding viral DNA structure is crucial for developing antiviral therapies.
Purpose of the Study:
- To investigate the physical state and structural characteristics of adenovirus deoxyribonucleic acid (DNA).
- To determine the molecular weight and morphology of DNA from specific adenovirus serotypes.
Main Methods:
- Extraction of deoxyribonucleic acids from purified adenovirus types 2, 7, and 12.
- Examination of extracted DNA using electron microscopy.
- Measurement of the lengths of cyclic DNA strands.
Main Results:
- Cyclic forms of deoxyribonucleic acid were identified in all examined adenovirus types.
- DNA strands from adenovirus type 2 exhibited significant length variability.
- The average length of cyclic DNA strands from adenovirus type 2 was approximately 2.5 microns, corresponding to a molecular weight of about 5 million.
Conclusions:
- Adenoviruses contain cyclic deoxyribonucleic acid.
- The findings provide insights into the structural organization of adenovirus genomes.
- This research contributes to the fundamental understanding of viral DNA in virology.
Related Concept Videos
The DNA Helix
Overview
Viral Structure
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
The DNA Helix
Overview
DNA as a Genetic Template
Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
The DNA Helix
Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
Nucleic Acid Structure
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...

