Nucleic acid

Which structural feature is shared by both adenine and guanine?

• Both contain two methyl groups.  

• Both contain one keto group.

• Both contain a five carbon atoms

• Both contain four nitrogen atoms.

Who took the first X-ray diffraction patterns of DNA in 1938?

• William Astbury

• Rosalind Franklin

• Francis H. Crick  

• Linus Pauling

Which of the following is not a nucloside?

• Adenosine

• Guanosine

• Cytosine

• Thymidine

The monomeric unit of nucleic acid are called ___________

• Nucleoside

• Nucleotide

• Pyrimidine

• Purine

Draw the structure of deoxyadenosine

Which technique was used by Erwin Chargaff to determine the composition of nucleotide?

• X-ray crystallography

• DNA sequencing

• X-ray diffraction

• Paper chromatography

The famous X-ray diffraction photograph of DNA, 'Photo 51', was developed by

• Astbury

• R. Franklin and R. Gosling

• Watson and Crick

• Max Perutz

 

If a section of DNA has 13% thymine, then there is _____ adenine

• 13%

• 26%

• 37%

• 74%

If there is 29% guanine in a section of DNA, then there is _____ thymine

• 21%

• 29%

• 41%

• 100%

What is the structural feature that is common to Uracil and Thymine?