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DNA Structure and Function

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Questions and Answers

What stabilizes the structure of the DNA double helix?

Van der Waals forces between the strands

Hydrogen bonds between the base pairs (correct)

Ionic bonds between phosphate groups

Covalent bonds within the sugar backbone

Which statement accurately describes the orientation of DNA strands?

Both strands are parallel to each other

Strands are oriented randomly in a double helix

One strand runs from 3' to 5', and the other runs from 5' to 3' (correct)

Both strands run in the same direction, 5' to 3'

What is the role of the sugar and phosphate molecules in DNA?

To form the base pairs

To contribute to the helical shape

To form the sides of the DNA ladder (correct)

To create the hydrogen bonds

Which pairing rule regarding base pairs in DNA is correct?

<p>Adenine pairs with Thymine using 2 hydrogen bonds (D)</p> Signup and view all the answers

What characteristic of the DNA double helix ensures a consistent shape?

<p>The uniform diameter due to complementary base pairing (D)</p> Signup and view all the answers

Study Notes

DNA Structure

DNA is a double-stranded molecule, shaped like a spiral staircase or helix.
The two strands are antiparallel, running in opposite directions (5' to 3' and 3' to 5').
The DNA structure resembles a twisted ladder, with the sugar-phosphate backbone forming the sides and the base pairs forming the steps.
The backbone is composed of alternating deoxyribose sugar and phosphate molecules.
Base pairs follow specific rules: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G).
This complementary base pairing occurs via hydrogen bonds (2 between A and T, 3 between C and G).
Hydrogen bonds stabilize the structure of the DNA double helix.
The consistent base pairing maintains a uniform diameter for the DNA double helix.

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Description

Explore the intricate structure of DNA, a double-stranded molecule fundamental to all living organisms. This quiz covers the arrangement of nucleotides, base pairing rules, and the significance of the sugar-phosphate backbone in maintaining DNA's stability. Test your knowledge on the helical nature of DNA and its components.