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DNA contains four kinds of nitrogenous base: adenine (A), thymine (T), guanine (G) and cytosine (C).
The DNA molecule is a double helix. It consists of two strands of smaller molecules called nucleotides wrapped around each other.
Each nucleotide is itself made of three components. These are a sugar (deoxyribose), a phosphate group and one of the four nitrogenous bases.
EAch strand in the DNA double helix consists of a 'backbone' of alternating sugar and phosphate groups with a nitrogenous base attached to each sugar. The bases in the two strands project towards each other and the strands are held together weak electrical bonds (called hydrogen bonds) between the bases.
The bases in the two strands always form specific base pairs. This means that an adenine in one strand always binds to a thymine in the other strand. Similarly, a guanine in one strand always binds to a cytosine in the other strand.
The bases consist of rings of carbon and nitrogen atoms. Thymine and cytosine have a single ring and are called pyrimidines. Adenine and guanine have a double ring and are called purines.
This double helix structure of DNA was discovered by James Watson and Francis Crick in 1953, marking the beginning of the age of molecular Biology. Their proposal of a double helix was partly based on data supplied by Rosalind Franklin, who thought at the time that attempts to build models of DNA structure were premature.. For more detail of Franklin's contrribution see http://en.wikipedia.org/wiki/Rosalind_Franklin.
For more information see:
http://learn.genetics.Utah.edu/units/basics/see right there you reaaaly dont need all that ok.
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Which is a single-ringed nitrogenous base?
Thymine is a single-ringed nitrogenous base.
How are complementary nitrogenous bases held together?
Complementary nitrogenous bases are held together by hydrogen bonds. Adenine pairs with thymine (or uracil in RNA) by forming two hydrogen bonds, while cytosine pairs with guanine by forming three hydrogen bonds. These hydrogen bonds provide the necessary stability for the base pairing in DNA and RNA molecules.
Which pair of nitrogenous bases will form a bond in a DNA molecule?
Complementary nitrogen bases pair by means of hydrogen bonds. Refer to the related link below for an illustration.
Is phosphorus part of the nitrogenous base?
No, phosphorus is not part of the nitrogenous base. The nitrogenous bases in DNA are adenine, thymine, cytosine, and guanine, which contain nitrogen atoms but not phosphorus. Phosphorus is primarily found in the sugar-phosphate backbone of the DNA molecule.
What are three types of pyrimidines?
Cytosine and thymine are the nitrogenous bases used in DNA. Uracil substitutes for thymine in RNA.
Which is a single -ringed nitrogenous base?
Thymine is a single-ringed nitrogenous base.
Which is a single-ringed nitrogenous base.?
Thymine is a single-ringed nitrogenous base.
Which is a singled-ringed nitrogenous base?
Thymine is a single-ringed nitrogenous base.
Is thymine a nitrogenous base?
yes
What is thymine in DNA?
Thymine is a nitrogenous base. It pairs with Adenine.
What are the nitrogenous base pairing rule?
adenine bonds to thymine cytosine bonds to guanine. (In RNA adenine bonds to uracil)
What is the nitrogenous base t?
thymine
What is the base uracil?
The base uracil is a nitrogenous base in RNA used for protein synthesis. It replaces Thymine from DNA.
What is a single ringed nitrogenous base?
Adenine is a single-ringed nitrogenous base found in DNA and RNA, paired with thymine in DNA and uracil in RNA.
Which nitrogenous base is found in the DNA?
Adenine, Thymine
What makes up an nucleotide?
A nucleotide consists of a nitrogenous base (adenine, thymine, cytosine, guanine, or uracil) which is connected to a deoxyribose sugar which in turn is bonded to a phosphate. All bonds are covalent bonds within the nucleotide.
Which is a single-ringed nitrogenous base?
Thymine is a single-ringed nitrogenous base.
