Transcription and Translation

Topic 3.5

3.5.1: Comparing the structures of RNA and DNA

Using the figure below compare the structures of RNA and DNA. Place your mouse pointer on the figure to show the differences.

rna vs dna structure

3.5.2: DNA Transcription

DNA transcription occurs in the nucleus. It involves the unwinding of the double helix and the formation of mRNA complementary to the DNA strand by RNA polymerase. DNA transcription uses complementary base pairing of adenine, thymine, cytosine and guanine (on the DNA) to uracil, adenine, guanine and cytosine (on the nRNA) respectively.

Place mouse pointer on the figure to view explanation for points 1 to 6.

You need to close the popup window by clicking on the x in the corner or it will stay open.

dna transcription link dna transcription animation
DNA Transcription Explained RNA polymerase used transcription factors used RNA binds promoter DNA unwound RNA nucleotides attached RNA detaches DNA rewound

3.5.3: What is the genetic code?

Genetic Code Explained

3.5.4: DNA Translation

DNA translation is the process used to synthesize proteins. It occurs in the cytoplasm either on free ribosomes or on the rough endoplasmic reticulum.

Place your mouse pointer on the figure to show the explanation of the process of translation.

dna translation link dna translation animation
Process of translation

3.5.5: The relationship between one gene and one polypeptide

One gene one polypeptide explained
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