DNA Structure Discovery Quiz

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What did Erwin Chargaff establish about the nitrogenous bases in DNA?

The number of purines is always less than pyrimidines.

The number of purines is always more than pyrimidines.

The number of pyrimidines is always less than purines.

The number of purines equals the number of pyrimidines. (correct)

Which technique did Rosalind Franklin and Maurice Wilkins use to analyze the structure of DNA?

Nuclear magnetic resonance

Electron microscopy

Chromatography

X-ray scattering (correct)

What did the X-ray scattering patterns of DNA suggest about its structure?

It was a random coil.

It had a planar structure.

It was linear in shape.

It was helical in nature. (correct)

Why did Watson and Crick arrange the two DNA strands with the sugar-phosphate backbones on the outside and the bases on the inside?

To fit the bases within the interior of a 2.0 nm-wide structure. Signup and view all the answers

What was the significance of the 1962 Nobel Prize in Physiology or Medicine awarded to Watson, Crick, and Wilkins?

Awarded for solving the structure of DNA. Signup and view all the answers

What did the repeating distances in X-ray scattering patterns imply about DNA molecules?

They have a regular and repeating structure. Signup and view all the answers

What is one of the fundamental characteristics that organisms share?

Replication Signup and view all the answers

What did Robert Hooke coin the term 'cells' for?

Pores in cork observed under a microscope Signup and view all the answers

Which of the following is not mentioned as one of the five fundamental characteristics of organisms in the text?

Oxygen production Signup and view all the answers

What is one goal that almost everything an organism does contributes to, according to Francois Jacob?

Replicating itself Signup and view all the answers

Which famous biologist is quoted in the text with the statement about the 'dream of a bacterium'?

Francois Jacob Signup and view all the answers

What did Robert Hooke devise in 1665 to examine the structure of cork?

Microscope Signup and view all the answers

What is the main difference between RNA and DNA molecules?

RNA molecules have more diverse size, shape, and reactivity than DNA molecules. Signup and view all the answers

What discovery led Sidney Altman and Thomas Cech to share the 1989 Nobel Prize in Chemistry?

Discovery of ribozymes or RNA enzymes catalyzing reactions similar to protein enzymes. Signup and view all the answers

Which statement best describes the Tertiary Structure Tetrahymena Ribozyme?

It catalyzes the hydrolysis and condensation of phosphodiester linkages in RNA. Signup and view all the answers

How does the relationship between ribozymes and proteins suggest the order of events in chemical evolution?

Ribozymes were crucial for protein synthesis before proteins were involved. Signup and view all the answers

What aspect of chemical evolution do random changes in nucleic acids lead to?

Synthesis of different proteins and ribozymes with selective advantages. Signup and view all the answers

What selective advantage allowed for the evolution of new functions during chemical evolution?

Advantages resulting from specific changes in proteins and ribozymes. Signup and view all the answers

DNA Structure Discovery Quiz

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