Multiple Choice
Which two types of molecules form the backbone of a DNA strand?
4
views
7. DNA and Chromosome Structure
DNA Structure
Struggling with Genetics?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which components form the sides (backbone) of the DNA ladder?
A
Adenine and thymine pairs
B
Ribose sugars and uracil
C
Nitrogenous bases only
D
Alternating deoxyribose sugars and phosphate groups
Verified step by step guidance1
Recall the structure of DNA, which is often described as a double helix resembling a twisted ladder.
Identify the components of the DNA ladder: the 'rungs' are made of nitrogenous base pairs (adenine-thymine and cytosine-guanine), while the 'sides' or backbone consist of repeating units.
Understand that the backbone is formed by alternating sugar and phosphate groups, specifically deoxyribose sugars in DNA.
Recognize that adenine and thymine are nitrogenous bases that pair to form the rungs, not the backbone.
Conclude that the sides of the DNA ladder are composed of alternating deoxyribose sugars and phosphate groups, which provide structural support.
Related Videos
Related Practice
