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13 Terms

1
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what are the two stages of protein synthesis?

Transcription and Translation

2
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What are Stages 1 -3 in transcriptions?

1= DNA polymerase moves along the DNA strand, unwinding the double helix. 2= hydrogen bonds break between the bases on the original DNA, unzipping the DNA. 3= As RNA polymerase breaks the bonds free nucleotides found in the nucleus join with their complimentary base on the DNA strand.

3
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Stages 4-5 of transcriptions?

4= the RNA nucleotide backbone forms on the newly synthesised MRNA strand. This strand is called primary transcription

4
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stages 6 of transcriptions?

the primary MRNA is now ready to go through a process called splicing before exiting the nucleus

5
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what are the three roles of RNA polymerase?

1= it moves along the DNA strand, unwinding the helix during transcription. 2= it also breaks the hydrogen bonds between the bases. 3= RNA polymerase synthesis a primary transcript of MRNA, it adds free RNA nucleotides by a complimentary base parings on exposed DNA strands.

6
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what is transcription?

a complimentary copy of DNA code created by mRNA.

7
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what does primary transcriptions contain?

coding and non coding transcriptions

8
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what are introns?

non coding regions(in the nucleus)

9
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what are exons?

coding regions (exiting the nucleus)

10
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what are coding regions?

contains information’s needed to make a protein

11
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what are maturing transcription?

removing the introns and splicing the exons

12
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what is splicing?

joining together the exons

13
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the order of exons in the process of splicing..?

never unchanges