Multiple Choice
In double-stranded DNA, guanine (G) always base-pairs with which nitrogenous base?
31
views
7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the DNA double helix, which two types of molecules form the sugar-phosphate backbone of each strand?
A
Deoxyribose sugars and phosphate groups
B
Ribose sugars and phosphate groups
C
Deoxyribose sugars and nitrogenous bases
D
Nitrogenous bases and phosphate groups
Verified step by step guidance1
Understand the structure of DNA: DNA is composed of two strands forming a double helix, where each strand has a backbone and attached bases.
Identify the components of the backbone: The backbone of each DNA strand is made up of repeating units that include a sugar molecule and a phosphate group.
Recall the specific sugar in DNA: In DNA, the sugar present is deoxyribose, which differs from ribose found in RNA by lacking one oxygen atom.
Recognize the role of nitrogenous bases: Nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the sugar but do not form the backbone themselves.
Conclude that the sugar-phosphate backbone consists of alternating deoxyribose sugars and phosphate groups linked by phosphodiester bonds.
Related Videos
Related Practice
