DNA Structure and Discovery Quiz

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Which scientist showed the amounts of the four bases on DNA (A,T,C,G) and provided evidence of molecular diversity among species?

Rosalind Franklin

Hershey and Chase

Erwin Chargaff (correct)

Fred Griffith

What must Adenine pair with according to Chargaff's Rule?

Guanine

Uracil

Cytosine

Thymine (correct)

Who provided crucial X-ray crystallography images that aided in determining the double helix structure of DNA?

Hershey and Chase

Rosalind Franklin (correct)

Fred Griffith

Erwin Chargaff

In DNA, what must Guanine pair with?

Cytosine Signup and view all the answers

What is the directionality of DNA, meaning the orientation of its strands?

5' to 3' Signup and view all the answers

What forms the backbone of the DNA molecule?

Phosphate groups and deoxyribose sugars Signup and view all the answers

Which enzyme is responsible for maintaining the length of telomeres by adding guanine-rich repetitive sequences?

Telomerase Signup and view all the answers

In which cells is telomerase typically exhibited?

Gametes and stem cells Signup and view all the answers

Which species has a repeat sequence of TTTAGGG in its telomeres?

Arabidopsis Signup and view all the answers

Which of the following organisms has TAGGG as the repeat sequence in its telomeres?

Slime Mold Signup and view all the answers

What is the function of telomerase regarding telomeres?

Extend telomeres by adding DNA bases Signup and view all the answers

Which enzyme is primarily involved in unwinding the DNA double helix during replication?

Helicase Signup and view all the answers

Who took diffraction x-ray photographs of DNA crystals in the 1950s?

Rosalind Franklin Signup and view all the answers

Which scientist built the first model of DNA using Rosalind Franklin's x-rays?

Francis Crick Signup and view all the answers

What did Watson & Crick's model of DNA reveal about the genetic material?

It showed a possible copying mechanism for the genetic material Signup and view all the answers

Which carbons need to be numbered in DNA nucleotides to indicate directionality?

5' and 6' Signup and view all the answers

What type of bonds form between nucleotides in the DNA backbone?

Phosphodiester bonds Signup and view all the answers

Which rule states that in DNA, the amount of adenine equals the amount of thymine, and the amount of cytosine equals the amount of guanine?

Chargaff's Rule Signup and view all the answers