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nucleic acids > Nucleic Acids > Flashcards

Nucleic Acids Flashcards

1
Q

what makes up a nucleotide ?

A

A pentose sugar, a phosphate group and a nitrogenous base

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2
Q

which sugar does DNA have?

A

a deoxyribose sugar

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3
Q

what are the two kinds of nitrogenous bases?

A

pyrimidines and purines

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4
Q

what are the purines?

A

Adenosine and guanin

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5
Q

what are pyrimidines?

A

Cytosine and thymine

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6
Q

which bonds are the nitrogenous bases held together by?

A

hydrogen bonds

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7
Q

in what directions do the polynucleotides face each other?

A

anti parallel.On 1 strand the phosphate group will be attached to the carbon 5’ on another strand the phosphate group will be attached to the carbon 3’

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8
Q

what are the complementary base pairings ?

A

A-T and C-G

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9
Q

how is DNA wound?

A

DNA is wound tightly together by histone proteins

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10
Q

The covalent bond between a sugar and a phosphate group

A

a phosphodiester bond

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nucleic acids (3 decks)

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