Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

6 Questions

1 Views

DNA Structure: 5' and 3' Ends

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What defines the 5' end of a DNA strand?

It features a phosphodiester linkage.

It has a free 5' phosphate group. (correct)

It has a free 3' hydroxyl group.

It is located at the center of the double helix.

What component primarily forms the backbone of DNA's primary structure?

A linear strand of sugar phosphate residues. (correct)

Deoxynucleoside 5'-monophosphates.

A pair of oligomeric nucleotides.

Hydrophobic bases stacked together.

Which statement accurately describes the structure of DNA?

DNA is comprised of two strands of opposite polarity. (correct)

DNA bases are located on the exterior of the double helix.

DNA has a left-handed helical structure.

DNA consists of only one polydeoxyribonucleotide strand.

Which unit is not a component of the monomeric units in DNA strands?

Deoxyribonucleotide (dNTP) Signup and view all the answers

What characteristic of deoxyribose subunits and phosphate groups is highlighted in DNA's structure?

They are hydrophilic and face the aqueous environment. Signup and view all the answers

Which feature of DNA's secondary structure pertains to base arrangement?

Planar bases are stacked in the interior of the helix. Signup and view all the answers

Study Notes

The 5' and 3' Ends

The 5' end features a free phosphate group, indicating an unlinked position in the phosphodiester bond.
The 3' end is identified by a free hydroxyl group or phosphate group.

The Primary Structure of DNA

Primary structure focuses on the sequence and quantity of deoxyribonucleotides in DNA strands, linked through phosphodiester bonds.
The backbone consists of a linear arrangement of sugar-phosphate groups, with nitrogenous bases (purines or pyrimidines) extending from the sugar, creating a lateral projection.

The Double Helix

DNA consists of two complementary strands of polydeoxyribonucleotides with opposing polarity, forming a right-handed helical shape.
Each strand is made up of monomeric units known as deoxynucleoside 5'-monophosphates, including dAMP (deoxyadenylate), dGMP (deoxyguanylate), dTMP (deoxythymidine), and dCMP (deoxycytidine).
The exterior of the double helix contains hydrophilic deoxyribose sugar and phosphate, interacting with the surrounding aqueous environment, while the hydrophobic interior holds the stacked planar bases.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Learn about the 5' and 3' ends of a DNA strand, including the phosphate groups and hydroxyl groups that define them, as well as the primary structure of DNA.