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BIOLOGY 12 > 4.1 DNA Structure > Flashcards

4.1 DNA Structure Flashcards

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1
Q

DNA is a chain of _______

A

nucleotides

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2
Q

What is a nucleotide

A

complex of 3 subunits: phosphoric acid (phosphate), pentose sugar (deoxyribose), nitrogen containing base

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3
Q

describe the 4 bases (purines, pyrimidines)

A

purines (double ring): adenine and guanine

pyrimidines (single ring): thymine and cytosine

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4
Q

describe complementary base pairing

A

hydrogen bonds

  • A pairs with T forms 2 hydrogen bonds
  • C pairs with G forms 3 hydrogen bonds
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5
Q

describe the structure of DNA

A
  • double helix strand made of alternating phosphate and sugar molecules
  • bases attached to sugar and project to one side
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6
Q

what does DNA being antiparallel mean

A

oriented in the opposite direction, carbon in sugar atom oriented differently

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BIOLOGY 12 (22 decks)

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