Watson and Crick

Why can’t the phosphate backbones face the inside?

• It doesn’t fit

• Phosphate backbones need to bond with the positive cations on the outside to provide structure and stability

• Phosphate is a cation so it bonds with the anions on the outside

• Phosphate backbones like the outside solution

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NGSS.HS-LS1-1

What did Watson and Crick observe that was wrong about the Pauling and Corey structure?

• Van Der Waal distance is too big

• dipole dipole distance is too big

• Hydrogen bond disntance is too small

• Van Der Waal distance is too small

Watson and Crick knew that _______ bonded with guanine and _________ bonded with thymine in DNA

• Cytosine, Adenine

• Adenine, Cytosine

• Uracil, Adenine

• Adenine, Uracil

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NGSS.HS-LS1-1

What was the most important idea they introduced?

• Van Der Waal forces

• Double helix shape

• Phosphates

• Discovered DNA

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NGSS.HS-LS1-1

Which scientist’s work did Watson and Crick not use?

• Chargaff

• Miescher

• Salk

• Levene

What do cations do for the DNA molecule?

• Provide structure and stability to DNA molecules

• Activate DNA molecules

• Acts like a catalyst for reactions within DNA molecules

• Holds together the two strands of DNA

Tags

NGSS.HS-LS1-1