Exploring the Structure of DNA

What is the primary function of DNA in living organisms?

• To provide energy for cellular processes

• To store genetic information

• To transport oxygen in the blood

• To catalyze biochemical reactions

Tags

NGSS.HS-LS3-1

Which technique did Chargraff use to analyze the composition of DNA?

• Gel electrophoresis

• Paper chromatography

• X-ray crystallography

• Mass spectrometry

What did Chargraff conclude about the composition of DNA?

• DNA is composed of a single type of nucleotide

• The amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine

• DNA is a triple helix

• DNA is composed of proteins

What technique did Rosalind Franklin use to study the structure of DNA?

• Nuclear magnetic resonance

• Paper chromatography

• X-ray crystallography

• Electron microscopy

What was one of Rosalind Franklin's key contributions to understanding DNA?

• She discovered the double helix structure

• She identified the sequence of nucleotides

• She provided evidence of the helical structure of DNA

• She synthesized DNA in the laboratory

What did Watson and Crick create based on Franklin’s photograph and Chargraff's findings?

• A model of the DNA double helix

• A new type of DNA sequencing method

• A theory of genetic inheritance

• A method for DNA replication

What is the significance of the double helix model of DNA?

• It explains how DNA can be replicated

• It shows that DNA is a single-stranded molecule

• It demonstrates that DNA is composed of amino acids

• It proves that DNA is not involved in heredity

Tags

NGSS.HS-LS3-1

Which of the following is NOT a component of a DNA nucleotide?

• Phosphate group

• Ribose sugar

• Deoxyribose sugar

• Nitrogenous base

What are the four nitrogenous bases found in DNA?

• Adenine, Thymine, Cytosine, Guanine

• Adenine, Uracil, Cytosine, Guanine

• Thymine, Uracil, Cytosine, Guanine

• Adenine, Thymine, Cytosine, Uracil

Which pair of scientists is credited with the discovery of the DNA double helix structure?

• Watson and Crick

• Franklin and Wilkins

• Chargraff and Avery

• Hershey and Chase