DNA Nucleotide Structure Quiz
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Questions and Answers

What is the specific base pairing rule between Adenine (A) and Thymine (T)?

  • Adenine pairs with Thymine (correct)
  • Adenine pairs with Guanine
  • Adenine pairs with Uracil
  • Adenine pairs with Cytosine

What is the approximate composition of chromatin in terms of histone proteins?

  • 60%
  • 70%
  • 30% (correct)
  • 40%

Which protein forms frameworks that guide DNA strands in the nucleus?

  • Histones
  • Scaffold proteins (correct)
  • RNA
  • CTCF protein

Which protein is known as the anchor protein that helps in DNA looping?

<p>CTCF protein (D)</p> Signup and view all the answers

What is the role of RNA in the context of genes and proteins?

<p>To act as a bridge between genes and proteins (B)</p> Signup and view all the answers

What is the term used to describe DNA coiled around a histone protein?

<p>Nucleosome (C)</p> Signup and view all the answers

Who deciphered 'photo 51' of the B-form of DNA?

<p>James Watson (A)</p> Signup and view all the answers

Which biochemist identified 5-carbon sugar ribose and deoxyribose?

<p>Phoebus Levene (D)</p> Signup and view all the answers

Who discovered that the three equal parts of a nucleotide are found in equal proportions?

<p>Erwin Chargaff (C)</p> Signup and view all the answers

Which scientist distinguished two forms of DNA using X-ray diffraction?

<p>Rosalind Franklin (B)</p> Signup and view all the answers

What regular relationship was observed by Erwin Chargaff regarding base compositions in DNA?

<p>A + G = T + C (A)</p> Signup and view all the answers

Which scientist made cardboard cut-outs of A, T, C, and G bases in DNA modeling?

<p>Francis Crick (D)</p> Signup and view all the answers

Which nitrogenous base in DNA is a purine?

<p>Guanine (C)</p> Signup and view all the answers

What type of bond forms between the deoxyribose sugars and the phosphates in DNA?

<p>Phosphodiester bond (C)</p> Signup and view all the answers

In DNA, what does the 5' carbon attach to?

<p>3' carbon of the next nucleotide (A)</p> Signup and view all the answers

Which of the following is NOT a component of a nucleotide?

<p>Hydrogen bond (A)</p> Signup and view all the answers

What is the specific pairing mode between purines and pyrimidines in DNA?

<p>Hydrogen bonding (A)</p> Signup and view all the answers

Why is DNA structure described as antiparallel?

<p>Because the two chains run in opposite directions (C)</p> Signup and view all the answers

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