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Flashcards in DNA Replication and Repair Deck (9)
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what is a nucleotide

Nucleotides are organic molecules that serve as the monomers, or subunits, of nucleic acids like DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). .


what makes up a nucleotide

a nitrogenous base, a sugar and one or more phosphate groups


describe a nucleotide in DNA

a deoxyribose sugar attached to a single phosphate group


what forms the backbone in DNA

nucleotides are covalently linked (phosphodiester bonds) to form a backbone


what can the base be in DNA

adenine, thymine, guanine or cytosine


the sugar phosphate backbone of DNA is made by what type of bond

a phosphodiester bond


what are two polynucleotide chains held together by

hydrogen bonding between the bases


complementary base-pairing is present in DNA, which base goes with which

adenine goes with thymine and guanine goes with cytosine


two polynucleotide chains making up DNA are said to be anti-parallel, what does this mean?

To make a stable double helix, the two strands of DNA are antiparallel; that is, the 5' → 3' direction of one strand runs opposite to the other strand.