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QLDBiologyQuick questions
Unit 4: Heredity and continuity of life
Quick questions on Transcription, translation and the genetic code (QCE Biology Unit 4)
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the genetic code?Show answer
The genetic code links sequences of nucleotides in mRNA to sequences of amino acids in protein. Its key features:
What is location?Show answer
Nucleus in eukaryotes, cytoplasm in prokaryotes.
What is enzyme?Show answer
RNA polymerase. It binds to a region of DNA called the promoter just upstream of the gene, unwinds a short stretch of the double helix and reads the template strand in the 3 prime to 5 prime direction.
What is eukaryotic processing?Show answer
The primary transcript (pre-mRNA) is modified before leaving the nucleus.
What is q1?Show answer
Describe transcription and translation, naming the location of each in a eukaryotic cell and the type of RNA involved. [4 marks]
What is q2?Show answer
An mRNA sequence 5'-AUG GCU UUU UGA-3' is translated. Identify the polypeptide produced and state the role of the stop codon. [3 marks]
What is q3?Show answer
Refer to a frameshift mutation. (a) Define frameshift mutation. (b) Predict the effect on the protein product.
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