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Biology > 2.3 Nucleic Acids > Flashcards

2.3 Nucleic Acids Flashcards

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1
Q

What is the structure of DNA?

A

• DNA consists of two polynucleotide strands
• The sugar phosphate backbone on the outside with the nitrogenous bases in the centre
• The bases of the one strand are complimentary to the bases on the other strand

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2
Q

What bond holds the two polynucleotide strands together?

A

Hydrogen bonds

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3
Q

What are the four bases, and which to they pair with?

A

• Guanine pairs with cytosine
• Adenine pairs with thymine

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4
Q

What are the purine bases?

A

Guanine and adenine
(Double ring)

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5
Q

What are the pyrimidines?

A

Thymine and cytosine
(single ring)

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