What is part of a DNA molecule?
DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.
Which of the following is not found in DNA?
Uracil
What are the six parts of a DNA molecule?
DNA is made up of six smaller molecules — a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).
Which nucleotide is not part of DNA?
These nitrogenous bases are Adenine (A), Cytosine (C) and Guanine (G) which are found in both RNA and DNA and then Thymine (T) which is only found in DNA and Uracil (U), which takes the place of Thymine in RNA.
Which sugar is found in DNA?
deoxyribose
What does a nucleotide look like in DNA?
Nucleotide A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T). In RNA, the base uracil (U) takes the place of thymine.
What are the pairs in DNA?
DNA base pair. Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .
What happens when adenine pairs with guanine?
Complementary Base Pairing You see, cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine. Or, more simply, C bonds with G and A bonds with T. It’s called complementary base pairing because each base can only bond with a specific base partner.
What does adenine pair with?
The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
Why do adenine and thymine have two bonds?
DNA. In the DNA helix, the bases: adenine, cytosine, thymine and guanine are each linked with their complementary base by hydrogen bonding. Adenine pairs with thymine with 2 hydrogen bonds. This difference in strength is because of the difference in the number of hydrogen bonds.
Are pyrimidines double ringed?
The purines, adenine and thymine, are smaller two-ringed bases, while the pyrimidines, cytosine and uracil, are larger and have a single ring.
What are the two purines?
Adenine and guanine are found in both DNA and RNA.
Why is DNA hydrogen bond weak?
Why is it advantageous to have weak hydrogen bonds between complementary bases and strong covalent bonds between phosphate and deoxyribose groups in a DNA molecule? The hydrogen bonds break easy making it easy for DNA to separate. The covalent bonds make sure nucleotides stay in each strand.
How many bonds are present in DNA?
two
Where is the hydrogen bond located in DNA?
The bases are linked by hydrogen bonds in the base pairs such that adenine (A) in one strand opposes thymine (T) in the other strand, and guanine (G) opposes cytosine (C), so that one strand of DNA is said to be complementary to the other (Part II, Chap.
Which hydrogen bond is the weakest?
S−H