What is DNA molecular structure?
The DNA molecule consists of two strands that wind around one another to form a shape known as a double helix. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), and thymine (T).
What are the 3 components of a DNA structure?
In turn, each nucleotide is itself made up of three primary components: a nitrogen-containing region known as a nitrogenous base, a carbon-based sugar molecule called deoxyribose, and a phosphorus-containing region known as a phosphate group attached to the sugar molecule (Figure 1).
What is the structure of DNA called?
double helix
Nucleotides are arranged in two long strands that form a spiral called a double helix. The structure of the double helix is somewhat like a ladder, with the base pairs forming the ladder’s rungs and the sugar and phosphate molecules forming the vertical sidepieces of the ladder.
What are the basic structures of a DNA?
Zooming in on DNA Structure
- A molecule of DNA consists of two strands that form a double helix structure.
- Each DNA strand is composed of nucleotides—units made up of a sugar (deoxyribose), a phosphate group, and a nitrogenous base.
What are the basic structure of a DNA?
DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).
What are the main component of DNA?
DNA has three types of chemical component: phosphate, a sugar called deoxyribose, and four nitrogenous bases—adenine, guanine, cytosine, and thymine.
What term best describes the shape of a DNA molecule?
Updated January 18, 2019. In biology, “double helix” is a term used to describe the structure of DNA. A DNA double helix consists of two spiral chains of deoxyribonucleic acid. The shape is similar to that of a spiral staircase.
What are correctly describes the structure of DNA?
DNA is a double-stranded molecule consisting of a long chain of nucleotides . A-form helix. RNA usually is a single-strand helix consisting of shorter chains of nucleotides.
Which phrase best describes the structure of DNA?
A double helix best describes the structure of DNA. DNA has a sugar phosphate back and nucleotides connected by covalent bonds. Together, it looks like a twisted ladder aka the double helix.
What is the general structure of the DNA structure?
General Genetics/Structure of the DNA Molecule. DNA is generally found as a double helix, composed of two chains, or strands, of nucleotides held together by hydrogen bonds.