20 Questions
Which molecule contains the genetic information for carrying out cell activities?
DNA
What is the structure of DNA?
Polymer
How many nitrogen bases make up the genetic code?
4
What did Watson and Crick discover about the structure of DNA?
It has a double helix structure
What is the role of Rosalind Franklin in the discovery of DNA structure?
She discovered the shape of DNA
Which molecule contains the genetic information for carrying out cell activities?
RNA
What is the shape of DNA?
Double helix
What is the role of Rosalind Franklin in the discovery of DNA structure?
She discovered the general shape of DNA
What are the building blocks of DNA?
Nucleotides
What is the size of a single fertilized egg when it begins?
Size of a period
What is a scientific theory?
A well-supported testable explanation of natural phenomena
What are scientific facts based on?
Homologous structures, fossil records, DNA sequencing
Who believed that living things were created in their present forms and were immutable?
Aristotle
Which scientist proposed the idea of the inheritance of acquired traits?
Lamarck
Who is known for their contribution to the theory of natural selection?
Charles Darwin
Who proposed the idea of the inheritance of acquired traits?
Erasmus Darwin
What are scientific facts based on?
Observable and measurable evidence
Who believed that living things were created in their present forms and were immutable?
Aristotle
What is a scientific theory?
A well-supported testable explanation of natural phenomena
What is the process by which modern organisms have descended from ancient organisms?
Evolution
Study Notes
DNA Structure and Composition
- Every cell in the body contains the same genetic material in the form of DNA.
- DNA is a polymer made up of nucleotides, which consist of a phosphate group, deoxyribose (sugar), and one of four nitrogenous bases.
- The four nitrogenous bases that make up the genetic code are Adenine, Thymine, Guanine, and Cytosine.
- The complete DNA sequence in every cell of an organism is called the genome.
- In 1953, Watson and Crick discovered that DNA consists of two long chains of nucleotides, forming a double helix structure.
- Rosalind Franklin was the first person to discover the general shape of DNA and the position of the phosphate groups.
- The sides of the DNA ladder are made up of repeating units of phosphate and sugar.
- The rungs of the DNA ladder are made up of two nitrogen bases held together by two hydrogen bonds.
- DNA looks like a twisted ladder, with the sides representing the phosphate and sugar units, and the rungs representing the nitrogen bases.
- DNA contains the information necessary for carrying out cell activities.
- DNA is inherited from both the mother and the father, with half of the DNA coming from each parent.
- DNA is the genetic material that determines the traits and characteristics of an organism.
Test your knowledge of DNA structure and function with this quiz! Learn about the composition of DNA, the role it plays in cell activities, and the structure of nucleotides. Challenge yourself to see how much you know about this essential molecule that carries our genetic information.
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