DNA Structure Quiz

What is the most common form of the DNA double helix?

• A-form DNA

• B-form DNA

• C-form DNA

• D-form DNA

What are the three components of a nucleotide in DNA?

• Sugar, phosphate, and nitrogenous base

• Sugar, phosphate, and amino acid

• Sugar, lipid, and nitrogenous base

• Sugar, lipid, and amino acid

Which carbon of the sugar is the nitrogenous base attached to?

• 1' carbon

• 2' carbon

• 3' carbon

• 4' carbon

How do nucleotides attach to each other in the DNA strand?

• Through peptide bonds

• Through hydrogen bonds

• Through phosphodiester bonds

• Through covalent bonds

What is the directionality of the DNA strand?

• 3' to 5'

• 5' to 3'

• Both 3' to 5' and 5' to 3'

• Neither 3' to 5' nor 5' to 3'

Which bases preferentially pair with each other in DNA?

• Adenine and guanine

• Thymine and cytosine

• Adenine and thymine

• Guanine and cytosine

What type of bonds stabilize the double helix structure of DNA?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Peptide bonds

What is the function of the major groove in DNA?

• Base pair recognition

• Protein binding

• Both base pair recognition and protein binding

• Neither base pair recognition nor protein binding

What is the function of the minor groove in DNA?

• Base pair recognition

• Protein binding

• Both base pair recognition and protein binding

• Neither base pair recognition nor protein binding

How many base pairs are there in each turn of the DNA helix?

• 5

• 10

• 15

• 20