Biology Topic Practice
DNA Structure and Nucleotides
DNA is a polymer made from four different nucleotides, which are the building blocks of life.
Can you name the four bases of DNA?
What is DNA Structure and Nucleotides?
"A nucleotide is the basic structural unit and building block for DNA, consisting of a nitrogenous base, a sugar, and a phosphate group."
Question 1
What is meant by the genome of an organism?
Question 2
Where are genes found?
Question 3
Select what is meant by the genome of an organism?
Nucleotide Structure
Each nucleotide consists of a common sugar and phosphate group with one of four bases attached.
The four bases are A, C, G and T.
A sequence of three bases is the code for a particular amino acid.
Exam Tip
The sugar-phosphate "backbone" provides structural support to the double helix.
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