Estrutura do DNA: Nucleotídeos, Pareamento de Bases e Dupla Hélice
9 Questions
1 Views

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

Qual é a forma da estrutura de DNA?

  • Forma de espiral
  • Hélice simples
  • Tripla hélice
  • Hélice direita dupla (correct)

Quantos tipos de bases nitrogenadas estão presentes no DNA?

  • Duas
  • Quatro (correct)
  • Cinco
  • Seis

Qual é a base que sempre se emparelha com a timina no DNA?

  • Citosina (C)
  • Adenina (A) (correct)
  • Uracila (U)
  • Guanina (G)

Como são mantidos unidos os pares de bases complementares no DNA?

<p>Ligações de hidrogênio (A)</p> Signup and view all the answers

Qual é a função das bases nitrogenadas no DNA?

<p>Replicação do DNA (A)</p> Signup and view all the answers

O que compõe um nucleotídeo de DNA?

<p>Açúcar, grupo fosfato, base nitrogenada (D)</p> Signup and view all the answers

Qual das seguintes opções mostra a correta emparelhamento de bases no DNA?

<p>A-C, G-T, T-A, C-G (C)</p> Signup and view all the answers

Qual é o nome do princípio que explica a estruturação do DNA?

<p>Regras de Chargaff (B)</p> Signup and view all the answers

Quais são os componentes básicos da estrutura do DNA?

<p>Ácido desoxirribonucleico e fosfato (A)</p> Signup and view all the answers

Study Notes

DNA Structure

DNA, or deoxyribonucleic acid, is a complex molecule that carries the genetic instructions for life. Its structure is composed of two strands of nucleotides twisted around each other in a right-handed helix, a shape known as the double helix. The structure of DNA is crucial for its function, as it allows for the replication and transcription of genetic information. In this article, we will delve into the details of the DNA structure, focusing on the subtopics of nucleotides, base pairing, and the double helix.

Nucleotides

The building blocks of DNA are nucleotides, which are made up of three parts: a 5-carbon sugar called deoxyribose, a phosphate group, and a nitrogenous base. There are four types of nitrogenous bases in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T). These bases are paired in a complementary manner, with A always bonding with T and C always bonding with G, a principle known as Chargaff's rules.

Base Pairing

Base pairing is the principle that explains the structure of DNA. Adenine (A) always pairs with thymine (T), and cytosine (C) always pairs with guanine (G). These complementary base pairs are held together by hydrogen bonds, which form between the nitrogenous bases on opposite strands. This base pairing is essential for the replication of DNA, as it allows for the formation of new strands during the process.

Double Helix

The double helix structure of DNA is a right-handed helix, with two strands of nucleotides twisted around each other. The two strands are antiparallel, meaning they run in opposite directions and are held together by hydrogen bonds between the complementary base pairs. The diameter of the DNA double helix is uniform throughout, ensuring that the information it carries can be accurately replicated and transcribed.

In conclusion, the structure of DNA is a marvel of biological engineering. Its nucleotides, base pairing, and double helix are all integral to its function, allowing for the transmission and expression of genetic information. Understanding these aspects of DNA structure has been fundamental to our modern comprehension of genetics and molecular biology.

Studying That Suits You

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

Quiz Team

Description

Este artigo explora em detalhes a estrutura do DNA, com foco nos subtemas de nucleotídeos, pareamento de bases e a dupla hélice. A estrutura do DNA é essencial para sua função biológica, permitindo a replicação e transcrição da informação genética.

More Like This

DNA Structure and Composition Quiz
5 questions

DNA Structure and Composition Quiz

InventiveRoseQuartz3991 avatar
InventiveRoseQuartz3991
DNA Structure and Function
13 questions

DNA Structure and Function

FaultlessWichita5770 avatar
FaultlessWichita5770
DNA Structure and Nucleotides Quiz
5 questions

DNA Structure and Nucleotides Quiz

IrreproachableBlackTourmaline2140 avatar
IrreproachableBlackTourmaline2140
DNA Structure and Base Pairing
16 questions

DNA Structure and Base Pairing

MindBlowingHeliotrope3032 avatar
MindBlowingHeliotrope3032
Use Quizgecko on...
Browser
Browser