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Flashcards in DNA Deck (3)
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Q

DNA:

A

DNA molecule has two strands coiled together in the shape of a double helix.

Two strands held together by chemicals called bases.

There are 4 different bases: adenine, thymine, guanine, cytosine.

Bases are paired, always pair in the same way.

Always adenine/thymine and cytosine/guanine. This is called base pairing.

The base pairs joined together by weak hydrogen bonds.

A gene is a section of DNA, and the sequence of bases in a gene code for a specific protein.

1
Q

DNA

A

A double helix of paired bases

2
Q

Who discovered DNA:

A

Rosalind Franklin and Maurice Wilkins worked out that DNA had a helical structure by directing beams of x-rays onto crystallised DNA and looking at the patterns the x-rays formed as they bounced off.

James Watson and Franklin Crick used knowledge that the amount of adenine + guanine matched the amount of thymine + cytosine to make a model of the DNA molecule where all the pieces fitted together.