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Gen Physio Lec > DNA > Flashcards

DNA Flashcards

1
Q

who took diffraaction x-ray photographs of DNA crystals

A

Rosalind Franklin

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2
Q

Who built the first model of DNA using Franklin’s models and when

A

Watson and Crick; 1950s

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3
Q

DNA is composed of a collection of

A

nucleotides

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4
Q

DNA have two strands coiled called

A

double helix

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5
Q

parts of nucleotides

A

deoxyribose sugar bonded to phosphate group, nitrogenic bases

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6
Q

what kind of bond in the deoxyribose and phosphate bond

A

phosphodiester bond

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7
Q

“Rungs of ladder”

A

nitrogenous bases

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8
Q

legs of ladder

A

phosphate and sugar backbone

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9
Q

most DNA has a ____ hand twist

A

right-hand twist

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10
Q

how many base pairs does a DNA have in every complete turn

A

10 base pairs

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11
Q

Meaning of DNA

A

deoxyribonucleic acid

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12
Q

DNA is made up of subunits known as

A

nucleotides

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13
Q

What is nucleotide made of

A

phosphate group
5-carbon sugar
nitrogeous base

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14
Q

why is DNA called anti-parallel strand?

A

one strand 5’ to 3’ while the other is 3’ to 5’ (going opposite in directon)

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15
Q

Two types of nitrogenous bases are

A

purine and pyrimidine

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16
Q

what are in purine

A

adenine
guanine

17
Q

how many rings does a purine have

A

double ring

18
Q

what are thepyrimidines

A

thymine
cytosine

19
Q

how many ring do pyrimidines have

A

single ring

20
Q

What are the base pairings

A

adenine thymine
guanine and cytosine

21
Q

how many hydrogen bonds are needed to bond guanine and cytosine

A

3 H bonds

22
Q

how many hydrogen bonds are required to bond adenine and thymine

A

2 H bonds

Gen Physio Lec (6 decks)

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