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18 Questions

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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?

CTCF protein Signup and view all the answers

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

To act as a bridge between genes and proteins Signup and view all the answers

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

Nucleosome Signup and view all the answers

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

James Watson Signup and view all the answers

Which biochemist identified 5-carbon sugar ribose and deoxyribose?

Phoebus Levene Signup and view all the answers

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

Erwin Chargaff Signup and view all the answers

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

Rosalind Franklin Signup and view all the answers

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

A + G = T + C Signup and view all the answers

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

Francis Crick Signup and view all the answers

Which nitrogenous base in DNA is a purine?

Guanine Signup and view all the answers

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

Phosphodiester bond Signup and view all the answers

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

3' carbon of the next nucleotide Signup and view all the answers

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

Hydrogen bond Signup and view all the answers

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

Hydrogen bonding Signup and view all the answers

Why is DNA structure described as antiparallel?

Because the two chains run in opposite directions Signup and view all the answers