Evidence for Semi-conservative Replication (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
In which year did Watson and Crick determine the structure of DNA?
In which year did Watson and Crick determine the structure of DNA?
1953
In the conservative model, what happens to the original DNA molecule during replication?
In the conservative model, what happens to the original DNA molecule during replication?
It remains completely intact
Which two nitrogen isotopes did Meselson and Stahl use in their experiment?
Which two nitrogen isotopes did Meselson and Stahl use in their experiment?
and
What technique did Meselson and Stahl use to separate different DNA types?
What technique did Meselson and Stahl use to separate different DNA types?
Density gradient centrifugation
Where does heavier DNA settle during density gradient centrifugation?
Where does heavier DNA settle during density gradient centrifugation?
Near the bottom of the tube
What density did all DNA show after one generation in medium (Generation 1)?
What density did all DNA show after one generation in medium (Generation 1)?
Intermediate density
What proportion of DNA was light density in Generation 2?
What proportion of DNA was light density in Generation 2?
50%
Why did Generation 1 results rule out the conservative model?
Why did Generation 1 results rule out the conservative model?
DNA showed single intermediate band
In semi-conservative replication, what does each new DNA molecule contain?
In semi-conservative replication, what does each new DNA molecule contain?
One original and one new strand
Which base pairs with adenine in complementary base pairing?
Which base pairs with adenine in complementary base pairing?
Thymine