DNA Structure and Replication Concepts

DNA Structure and Replication Concepts

Assessment

Interactive Video

Biology, Science, Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial covers the structure of DNA, explaining its components like nucleotides, which consist of a phosphate group, a sugar, and a nitrogen base. It discusses Chargaff's rules, highlighting the equal ratios of adenine to thymine and cytosine to guanine. The discovery of DNA's double helix structure by Watson and Crick, aided by Rosalind Franklin's x-ray crystallography, is detailed. The process of DNA replication is explained, emphasizing the role of enzymes like DNA helicase and DNA polymerase, and the concept of semi-conservative replication.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the three main components of a nucleotide?

Phosphate group, ribose sugar, amino acid

Phosphate group, five-carbon sugar, nitrogen base

Phosphate group, glucose, nitrogen base

Phosphate group, deoxyribose sugar, lipid

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to Chargaff's rules, if a DNA sample contains 20% adenine, what percentage of thymine should it contain?

20%

10%

30%

40%

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Who used X-ray crystallography to help discover the structure of DNA?

Erwin Chargaff

Francis Crick

Rosalind Franklin

James Watson

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the shape of the DNA structure discovered by Watson and Crick?

Single strand

Double helix

Quadruple helix

Triple helix

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the DNA double helix, what type of bonds hold the nitrogen bases together?

Hydrogen bonds

Covalent bonds

Metallic bonds

Ionic bonds

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which part of the DNA structure is referred to as the 'backbone'?

Amino acids

Hydrogen bonds

Phosphate and sugar

Nitrogen bases

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of DNA helicase in replication?

To unzip the DNA double helix

To repair DNA mutations

To join nucleotides together

To synthesize new DNA strands

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