Which of the following describes the structure of DNA?
Practice Questions
Q1
Which of the following describes the structure of DNA?
Single-stranded helix
Double-stranded helix
Triple-stranded helix
Linear structure
Questions & Step-by-Step Solutions
Which of the following describes the structure of DNA?
Correct Answer: DNA is a double-stranded helix.
Step 1: Understand that DNA stands for Deoxyribonucleic Acid, which is the molecule that carries genetic information.
Step 2: Learn that DNA has a specific shape called a double helix, which looks like a twisted ladder.
Step 3: Recognize that the double helix is made up of two long strands that run alongside each other.
Step 4: Note that these two strands are not parallel; they run in opposite directions, which is called 'antiparallel.'
Step 5: Remember that the sides of the ladder (the strands) are made of sugar and phosphate, while the rungs (the steps) are made of pairs of nitrogen bases.
