Click the Next button to watch the following presentation and learn more about the structure of DNA.
Take out a piece of paper to respond to the questions below.
Interactive popup. Assistance may be required.
The basic structure of DNA is a double helix, or twisted ladder.Interactive popup. Assistance may be required.
The building blocks of DNA are nucleotides.Interactive popup. Assistance may be required.
The parts of a nucleotide include the following: phosphate group, deoxyribose sugar, and a nitrogen base.Interactive popup. Assistance may be required.
The two sides of the DNA ladder are made up of phosphate and deoxyribose sugar.Interactive popup. Assistance may be required.
When DNA has antiparallel strands is means that the different strands in the helix run in opposite (anti-parallel) directions. At each end of the double helix, one strand is 5', and the other is 3'.Interactive popup. Assistance may be required.
Nitrogen bases makes up the steps or rungs of the DNA ladder.Interactive popup. Assistance may be required.
It is the order of the nitrogen bases that carries the human genetic code.Interactive popup. Assistance may be required.
The four nitrogen bases include the following: adenine, thymine, guanine and cytosine.Interactive popup. Assistance may be required.
thymineInteractive popup. Assistance may be required.
A weak hydrogen bond holds the nitrogen bases together.