At the start of polypeptide synthesis in a cell, DNA transcription occurs in the nucleus to form mRNA - Scottish Highers Human Biology - Question 2 - 2016
Question 2
At the start of polypeptide synthesis in a cell, DNA transcription occurs in the nucleus to form mRNA.
The sequence of bases from a section of a DNA strand is shown ... show full transcript
Worked Solution & Example Answer:At the start of polypeptide synthesis in a cell, DNA transcription occurs in the nucleus to form mRNA - Scottish Highers Human Biology - Question 2 - 2016
Step 1
State the sequence of bases in the primary mRNA transcript formed from this strand of DNA.
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Answer
The sequence of bases in the primary mRNA transcript, formed through complementary base pairing with the DNA, is:
G U G C U A U C C U A.
Step 2
State the term used to describe the coding regions of a primary mRNA transcript.
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Answer
The coding regions of a primary mRNA transcript are referred to as exons.
Step 3
Name the process by which the coding regions of a primary mRNA transcript are joined together to produce a mature mRNA transcript.
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Answer
The process by which the coding regions are joined together is called RNA splicing.
Step 4
Using this mature mRNA transcript, state the order of bases in the intron present in the primary mRNA transcript.
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Answer
The order of bases in the intron present in the primary mRNA transcript is:
C A G A T G G A.
Step 5
State the location for the translation of a mature mRNA transcript into a polypeptide.
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Translation of a mature mRNA transcript into a polypeptide occurs in the ribosome.
Step 6
Describe one form of post-translational modification of a polypeptide.
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One form of post-translational modification is the cleavage of polypeptide chains, which can be cut or recombined. Another modification includes the addition of phosphate or carbohydrate groups to the polypeptide.
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